T ab le Of Contents - G

T ab le Of Contents - G
Table Of Contents
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Everyday driving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Main Screen Overview. . . . . . . . . . . . . . . . . . . . . . . . . . .
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Real-time G Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G Peak Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
14
15
16
Performing a Run. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Measuring Your Runs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Viewing Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Overview — Run Results . . . . . . . . . . . . . . . . . . . . . . . .
Speed graph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RPM replay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP Graph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dyno plot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G force graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60-0 Braking Distance. . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
27
28
30
31
33
34
Saved Runs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
The Saved Runs screen . . . . . . . . . . . . . . . . . . . . . . . . . . 36
1
Car Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Set redline / shiftlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
RPM calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Enter car weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Pitch correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
G-Tech Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
LCD Contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
US or Metric mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Set date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Set to factory defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Mounting System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Mounting the G-tech . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Assembling the Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Mounting the Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Adjusting the Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Removing the bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Advanced Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table Of Contents
G-tech Front Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
G-tech Back Side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Icons and Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Quick Setup Before First Use . . . . . . . . . . . . . . . . . . . . . 10
Quick reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Top 10 run list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
All runs list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Deleting saved runs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Measuring 0-40 MPH, etc. . . . . . . . . . . . . . . . . . . . . . . . . . 58
Measuring 50-70 MPH, etc.. . . . . . . . . . . . . . . . . . . . . . . . 59
Measuring 0-60-0, 0-100-0, etc. . . . . . . . . . . . . . . . . . . . . 61
More info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Rollout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
G-TECH / Pro SS User Guide
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Determining your pitch factor . . . . . . . . . . . . . . . . . . . . .
RPM Calibration Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horsepower, Torque & G-tech . . . . . . . . . . . . . . . . . . .
Self-leveling the G-tech . . . . . . . . . . . . . . . . . . . . . . . . . .
Tips for improving Accuracy . . . . . . . . . . . . . . . . . . . . . .
Bypassing the Boot-up screen . . . . . . . . . . . . . . . . . . . . .
Version and serial number . . . . . . . . . . . . . . . . . . . . . . . .
How much does my vehicle weigh? . . . . . . . . . . . . . . . .
Getting more from your G-tech . . . . . . . . . . . . . . . . . . .
Contact info. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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64
66
67
70
70
71
72
72
73
74
G-TECH / Pro SS User Guide
List Of Figures
Figure 1: G-tech front. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Figure 2: G-tech rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Figure 3: G-tech DC power cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Figure 5: Main Menu: “Car Setup” icon selected . . . . . . . . . . . . . . . 10
Figure 6: Quick setup steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7: G-tech Main Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8: Real-time G Meter examples. . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9: G-Peak Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 20: G Force Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Figure 21: Braking and accelerating . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Figure 22: Saved Runs screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Figure 23: Status of run slots indicated by appearance . . . . . . . . . . .37
Figure 24: Run ordering of top-10 list . . . . . . . . . . . . . . . . . . . . . . . . .37
Figure 25: Run ordering of the “all runs” list . . . . . . . . . . . . . . . . . . . .38
Figure 26: US and metric mode units and measurements . . . . . . . .47
Figure 27: Mounting bracket parts . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Figure 28: G-tech screen during power-on initialization . . . . . . . . . .71
Figure 10: Right-turn G-Peak value . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11: 0-60 MPH Run Results menu entry selected . . . . . . . . . 24
Figure 12: Summary of G-tech Results . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 13: Speed graph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
List Of Figures
Figure 4: The G-tech’s Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Figure 19: Dyno Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Figure 14: RPM replay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 15: RPM replay — launch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 16: RPM replay — milestones . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 17: RPM replay — shifts and gears . . . . . . . . . . . . . . . . . . . . . 30
Figure 18: HP Graph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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G-TECH / Pro SS User Guide
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G-TECH / Pro SS User Guide
G-TECH / Pro SS
Performance Meter
For us, the G-tech has been a labor of love. It has all of the
features you’ll ever want and there is truly nothing else like it
in the world.
Thank you for purchasing your G-TECH / Pro SS Performance Meter.
Our motto has always been to bring the latest technology
and innovation into the hands of our customers and maybe
contribute, in a small way, to brightening their day.
I am very pleased and proud to present this product to you
and welcome you to our G-tech users family.
So, without further ado, go out there and have some fun.
As you read along and especially as you start having fun with
your G-tech you will realize something. You will see that this
is a precision instrument with a high level of sophistication
designed by guys who – just like you – have gasoline in their
blood and love for cars. Guys who have spent years of sleepless nights to perfect this product.
Please drive safely.
Jovo Majstorovic
President, Tesla Electronics Inc.
It’s up to you to decide how far you want to take the G-tech.
You can do 0-60 mph and 1/4 mile measurements after only
a brief setup procedure.
Or, as you become more familiar with the G-tech’s powerful
capabilities, you will learn how to create very valuable tuning
records and increase the consistency of your measurements.
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G-TECH / Pro SS User Guide
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Warning: Always obey all local and federal laws when
using this device. This device is not intended for street or
highway use. Use only in designated areas, closed courses
and racetracks.
Tesla Electronics, Inc. shall not be held liable for technical or
editorial errors or omissions made herein; nor for incidental
or consequential damages resulting from the furnishing, performance or use of this material.
Warning: Adverse weather conditions can severely impair
a vehicle’s controllability, especially at high speed. When
using this device, drive cautiously and within the limits of
your vehicle under the conditions.
Tesla Electronics, Inc. shall not be held liable in any way for
any incidental or consequential damages to the vehicle,
driver, passengers, and/or other involved parties or property
occurring while using the G-tech.
Warning: Don’t take your eyes off the road. The G-tech will
record your results for viewing and playback after the run.
This device is designed as a test and tuning tool to measure
performance and safety characteristics of a given vehicle.
Use it for that purpose only.
TESLA Electronics Inc. reserves the right to make changes to
this manual and other product specifications at any time
without any further notice.
The content of this manual is for informational use only and
is not intended as a commitment of any kind.
Please drive safely.
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G-TECH / Pro SS User Guide
Getting Started
This section tells you what you need to know
before using your G-tech for the first time.
Getting Started
1
Every new user should read this section!!!
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G-TECH / Pro SS User Guide
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G-tech Front Side
G-tech Back Side
Photosensor
LEDs
The back of the G-tech is shown in Figure 2:
DC Power Jack
OK Button
Menu Button
Navigation
Buttons
Figure 1: G-tech front
Serial Communications Port
• Photosensor – measures ambient light
• Light Emitting Diodes (LEDs) – red light indicators
• OK button (
) – used to confirm / select items
• MENU button (
) – brings up multi-line menus
• Navigation buttons ( , ,
and ) – used for
moving cursor around in menus, graphs, etc.
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G-TECH / Pro SS User Guide
Figure 2: G-tech rear
• DC Power Jack – plug in either of the supplied DC
power cables into this connector
• Serial Communications Port – allows communication
between G-tech other devices such as a computer.
Cables
The G-tech ships with a power cable as shown below:
Icons and Navigation
Pressing the
key from the Main Screen brings up the main
menu, as shown below:
Figure 3: G-tech DC power cable
• 12V cigarette lighter DC Power Cable – supplies
power from vehicle’s accessory (cigarette lighter) plug.
The DC Power Cable has a fuse in the end that plugs into
your vehicle. If the cable does not seem to provide power,
the fuse may be blown and need replacing.
To replace the fuse, unscrew the tip and replace the fuse
with a standard 1 AMP fuse. Fuses can normally be purchased
at any automotive parts store.
Menu Title Bar
Selected Icon
Figure 4: The G-tech’s Main Menu
Getting Started
The G-tech’s functionality is accessible through its userfriendly icon interface.
The name of the menu appears in the Menu Title Bar at the
top of the display (“Main Menu”).
The Main Menu has 4 icons. The first icon, a folder, is in
“reverse video” because it is the active (selected) icon. Use
the navigation buttons ( , ,
and ) to move
amongst the different icons.
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G-TECH / Pro SS User Guide
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For example, pressing
selection to the “Car
in Figure 4 would move the icon
icon, as shown below:
Setup”
Quick Setup Before First Use
Please perform the following steps before using your G-tech
for the first time:
Icon Hint
Completion
Time
Go to...
Set time & date
1 minute
p. 47
Figure 5: Main Menu: “Car Setup” icon selected
Set vehicle redline
1 minute
p. 40
The “Car setup” Icon Hint in Figure 5 indicates that the
selected icon represents car-related setup items.
Enter car weight
1 minute
p. 42
Calibrate RPMs
2 minutes
p. 41
Use the
button to make a selection. For example, to customize the G-tech for your car, you would move to the
Mount G-tech
2 minutes
p. 50
“Car
Setup”
icon (
), and then press
.
Selecting the “Exit” icon (
) on any menu brings you up
one level. If you are on the Main Menu when you select
“Exit”, you will be returned to the Main Screen.
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Setup Item
G-TECH / Pro SS User Guide
Figure 6: Quick setup steps
Quick reference
If You Want To:
Go To:
Set up the G-tech so
you can start using it
“Quick Setup Before First Use”
(p. 10)
Calibrate RPMs
“RPM calibration” (p. 41)
Mount the G-tech
“Mounting the G-tech” (p. 50)
Measure your 1/4 mile
performance
“Measuring Your Runs” (p. 18)
Measure 0-60 MPH
Measure 60-0 braking
distance
“60-0 Braking Distance” (p. 34)
Do a 0-100-0 MPH run
“Speed graph” (p. 27)
Measure lateral (cornering) G’s
“Real-time G Meter” (p. 15)
Switch to metric mode
“US or Metric mode” (p. 46)
See where you shifted
during a run
“RPM replay” (p. 28)
View the results from a
previous run
“Saved Runs” (p. 35) and “Viewing Results” (p. 23)
Increase the accuracy
of measurements
“Tips for improving Accuracy” (p.
70)
“Measuring Your Runs” (p. 18)
and “Overview — Run Results”
(p. 24)
Use the shiftlights to
improve track times
“Set redline / shiftlights” (p. 40)
Measure horsepower
and torque
“Dyno plot” (p. 31) and “Horsepower, Torque & G-tech” (p. 67)
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Go To:
G-TECH / Pro SS User Guide
Getting Started
If you know what you want to do, but just don’t know where
to find the answer, this is the section for you!
If You Want To:
11
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G-TECH / Pro SS User Guide
Everyday driving
This section will explain the Main Screen, which
measures RPMs and G Forces.
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G-TECH / Pro SS User Guide
Everyday driving
2
13
Main Screen Overview
Tachometer
After power-on, the G-tech begins measuring G-force and
RPMs, and displays the Main Screen (Figure 7):
Note:
For the tachometer to work properly, you must set
redline (p. 40) and perform an RPM calibration (p. 41).
G-Arrow
The G-tech’s tachometer responds to real-time changes in
your vehicle’s RPM level.
Info Bar
G-Value
The tach is customized for your vehicle, based on your redline setting and RPM calibration.
Tachometer
Current RPMs
Redline
Region
Figure 7: G-tech Main Screen
The redline region is indicated as a shaded area in the upper
RPM range.
The Main Screen has 3 main indicators:
• Tachometer – vehicle RPMs
If you have shiftlights enabled (p. 40), you will notice them
turning on as you approach redline on the tachometer.
• G-Value – measured vehicle G-force
• G-Arrow – direction of G-force
The Info Bar at the top always provides customized information for the current display.
14
The lower RPM range is drawn with a narrow band. The
upper RPM range, which is usually of greater interest to racers, is emphasized with a wider band for greater visibility.
G-TECH / Pro SS User Guide
Figure 8 illustrates how to read the Real-time G Meter.
Real-time G Meter
The G Force Meter can only be used on flat, level
Note:
ground. The readings will not be accurate on banked turns, hills,
etc.
The Real-time G Meter is a combination of the G-Value and
the G-Arrow. It indicates both the amount and direction of
G-force, whether your vehicle is braking, cornering, or blasting down the dragstrip.
The display is continuously updated in response to your driving, and tells you all you need to know about your vehicle’s
handling and acceleration capabilities.
The G-value indicates the amount of G-force to within a onehundredth of a G. The G-Arrow indicates the direction of Gforce.
15
G-Value
Condition
.85
Accelerating Fwd 0.85 Gs
.75
Right Turn 0.75 Gs
.34
Left Turn 0.34 Gs
1.55
Braking 1.55 Gs
.28
Left Turn & Accelerating 0.28 Gs
.56
Right Turn while Braking 0.56 Gs
.00
Minimal G-force
Everyday driving
Note:
For the Real-time G Meter reading to be accurate,
your G-tech must be self-leveled. Any time you power on or move
the G-tech, it needs to be self-leveled. See page 70 for more
information. (The G-tech automatically self-levels every time you
perform an acceleration run).
G-Arrow
Figure 8: Real-time G Meter examples
G-TECH / Pro SS User Guide
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Example: Tapping
from the Main Screen displays the maximum Gs that were measured while turning right (Figure 10):
G Peak Display
The G-tech monitors G-Force levels in all directions, watching for a new “peak” value in any direction. As shown in Figure 9, the peak G value in any direction can be displayed by
tapping the appropriate navigation button ( , , , ).
Peak Value
Hint
Right
Turn
Gs
Figure 10: Right-turn G-Peak value
G-Peak
Indicator
Figure 9: G-Peak Indicator
To see peak:
Briefly tap this button:
Forward Gs
To reset the peak G value for a particular direction, from the
Main Screen, you must press and hold the button for 2 seconds. The display will indicate that the G-force peak value for
that direction has been reset to zero.
Note:
The peak G values are not saved when power is
removed.
Braking Gs
Left Turn Gs
Right Turn Gs
16
In this example, the highest measured G-force while turning
right was 1.78 Gs. Note the small right arrow in reverse
video, this indicates the displayed peak value is for right turns.
G-TECH / Pro SS User Guide
Performing a Run
This section will show you how to use the G-tech to
monitor your vehicle’s straight-line performance.
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G-TECH / Pro SS User Guide
Performing a Run
3
17
Measuring Your Runs
2
Make sure the G-tech is mounted properly, powered on, and return to the Main Screen.
3
4
Stop your vehicle on flat, level ground.
Note:
The driving technique for accurate horsepower and
torque measurements is very different than the driving technique for fast 1/4 mile times. Please be sure to read “Horsepower, Torque & G-tech” (p. 67) before using the G-tech to
measure horsepower and torque.
This section describes how to measure accelerating and braking performance.
1
Ensure the G-tech has enough free storage remaining to store your run by checking the Saved Runs
screen (p. 36).
Press
. You will see a screen like this:
.
The G-tech ensures that the vehicle is stopped.
This “staging” process takes about 1 second,
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G-TECH / Pro SS User Guide
5
After about 1 second, the upper left LED will begin
blinking, and the screen will change as shown
below. At this point, the G-tech is ready to go!
Note:
The G-tech requires some “oomph” off the
starting line, so don’t baby it! If your G-tech doesn’t
start timing, launch your car with more force.
E.T.
Tach
The large .00 indicates the forward Gs measured during the run.
The smaller 0.000s indicates elapsed time (E.T.) measured during
the run. These begin updating as soon as the vehicle is launched.
6
Accelerate your vehicle briskly off the line.
The G-tech will detect the forward acceleration
and automatically activate the E.T. clock and Greading. The blinking LED will turn off once you
have launched successfully.
8
When you hit 60 MPH, the G-tech will briefly light
an LED and display the 0-60 MPH time. (Don’t
worry, even though the G-tech display freezes
briefly with the 60 MPH time, it is continuing to
time in the background.)
G-force at 60 MPH
0-60 MPH
time
60 MPH
LED
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G-TECH / Pro SS User Guide
Performing a Run
Forward
Gs
7
19
9
If you have shiftlights enabled, they will illuminate as
you approach the redline shiftpoint in each gear.
11
To finish the run:
• if you also want to measure braking distance,
brake strongly all the way to a complete stop,
and wait for the E.T. clock to stop
Shiftlights
• if you do not care about braking distance, simply let off throttle and coast for about 1 second, until the E.T. clock stops
• or simply press
10
When you pass the 1/4 mile, the G-tech lights an
LED to indicate the E.T and trap speed are saved.
1/4 mile
LED
at any point to stop timing
The G-tech also stops timing when you travel 4000
ft or reach 300 MPH - most users will not encounter this situation though.
12
The run will be saved automatically. While the run
is being saved, the display will show the G-Force
and time measured at the 1/4 mile, 1/8 mile or 60
ft mark, depending on how far you traveled.
If you do not have enough free storage
Note:
memory, or if you do not travel at least 60 ft., the run
will be discarded.
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G-TECH / Pro SS User Guide
Once the run has been saved, you will be taken to
the Run Results menu, where you can view the
results.(p. 23).
14
When you exit the Run Results menu, you will be
taken back to the Main Screen, where you can
monitor G-force and RPMs, or get ready to do
another run.
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Performing a Run
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G-TECH / Pro SS User Guide
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G-TECH / Pro SS User Guide
Viewing Results
This section will show you how to view and analyze
your run results.
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G-TECH / Pro SS User Guide
Viewing Results
4
23
Overview — Run Results
The Run Results are all the details of a particular run. These
results include:
Each entry in the run results menu has a 2 functions. First,
when you select an entry, the highlighted result is displayed.
Additionally, each entry has an associated graph that can be
viewed by pressing . The title bar at the top of each entry
indicates which graph will be shown when you press .
• 0-60 MPH time
Use
and
to view the different results. Use
to exit.
• 1/4 mile E.T. and trap speed
Figure 11 below shows the 0-60 menu entry as an example.
• Horsepower and torque
3
1
• RPM replay
• Intermediate milestones, such as 60 ft time, 330 ft time,
1/8 mile time and speed, 1000 ft time
There are 2 ways to enter the Run Results menu:
1
Indicates this is the 0-60 MPH result.
• Automatically after you have performed a run.
2
Pressing
will change to the 1/4 mile result.
• When you review a saved run (p. 35).
3
Pressing
will bring up the Speed graph.
4
The 0-60 MPH time was 2.98s for this run.
The G-tech remembers what type of result you most
recently looked at (e.g. HP, 0-60 MPH, etc.) and brings you
back to the same result when you view a new run.
24
4
2
• Forward G-force measurements
G-TECH / Pro SS User Guide
Figure 11: 0-60 MPH Run Results menu entry selected
Run Results Menu Entries
Menu entry
brings up:
Graph provides:
Graph is useful for:
Graph of vehicle speed
throughout the run
• Measuring time to get from
one speed to another speed
(e.g. 0-100 MPH, 50-70 MPH,
0-100-0 MPH, etc.)
Speed Graph (p. 27)
Graph of Vehicle RPMs • Finding shift points
throughout the run,
• Measuring gear shifts
and milestones such as
60 ft and 1/8 mile time • Viewing intermediate milestones (e.g. 60 ft time)
1/4 mile E.T. and Trap Speed
• Detecting wheelspin
RPM replay (p. 28)
Graph of Horsepower
output throughout the
run
Peak HP and RPM
25
Viewing Results
0-60 MPH time
(also shows 60-0 braking distance if occurred)
Pressing
• Estimating effects of wind
drag on your vehicle
• Looking at horsepower
throughout the run
HP Graph (p. 30)
G-TECH / Pro SS User Guide
25
Menu entry
Peak Torque and RPM
Pressing
brings up:
Graph provides:
Graph is useful for:
Graph of Horsepower
and Torque throughout a particular RPM
range in a single gear
• Getting a “dyno plot” for
your vehicle
Graph of G-force
throughout the run
• See how strong your car was
pulling (accelerating) throughout the run
• Determining the best shiftpoint
Dyno Plot (p. 31)
(HP & TQ vs RPM Graph)
• See how well your car brakes
Peak Forward Gs during run
• Detecting wheelspin
G force graph (p. 33)
Figure 12: Summary of G-tech Results
26
G-TECH / Pro SS User Guide
Cursor
80MPH marker
You can use this graph to measure:
• time to get from one speed to another speed (e.g., 0-50
MPH, 40-60 MPH, etc.)
• time to accelerate from 0 to a certain speed, and brake
to 0 again (e.g., 0-100-0 test)
• time to brake to a halt from a particular speed (e.g., 600 braking time)
Time
Speed at cursor
Time at cursor
Figure 13: Speed graph
Each tic mark on the horizontal axis marks a 1-second difference. Each tic mark on the vertical axis marks a 10 MPH difference.
You will see a graph such as the one shown in Figure 13. Of
course the shape of the curve, as well as the numbers and
milestones, will be different for your vehicle.
A plus sign (+) marks a 10 MPH change. Whenever you
move the cursor past a plus sign, the numbers on the bottom
of the graph are updated to reflect the time to get to that
speed from 0 MPH.
Use
and
to move the cursor on the graph. As you
move the cursor, the current speed and elapsed time indicators are updated to match the cursor position.
Note:
The speed milestone indicator does not change until
the cursor rolls over a different 10 MPH marker.
Viewing Results
The Speed graph provides you with a graph of speed
throughout the run.
70 MPH marker
Speed
Speed graph
Note:
See “Advanced Testing” (p. 57) for detailed information on using this graph.
27
G-TECH / Pro SS User Guide
27
replay, the G-tech illuminates an LED at any point where the
shiftlights were on during the run.
RPM replay
provides you with a graph of vehicle RPMs
throughout the run. This is one of the most-used G-tech
graphs.
RPM replay
By looking at the data in this graph, you can find out:
• how much time you spent in each gear
To finish the replay quickly, rather than in real-time,
Note:
simply press the
button while it is being drawn.
Once the graph is fully drawn, you will see a graph such the
one shown in Figure 14.
Note:
Your graph will look different due to your driving style
and vehicle.
• what time each shift occurred, and how long each shift
lasted
Cursor (current position)
60ft. mark
• the RPMs (and implied gear) for each milestone
• if wheelspin occurred (sudden sharp rise in RPMs)
• if you should refrain from shifting near the finish for better results (that shift into 4th just before the finish might
be costing you!)
In order to give you the feel and excitement of the run, the
RPMs are replayed in real-time, just as they were happening
during the run. This means that if you did a 15-second run, it
will take 15 seconds to draw the RPM replay. During RPM
28
G-TECH / Pro SS User Guide
Both
change as
cursor
moves
RPMs
• the RPM range in each gear
Milestone
Region
Time
Figure 14: RPM replay
Use
and
to move the cursor along the RPM curve. As
the cursor moves, the RPM value and timestamp value adjust
to reflect the values at the cursor position.
You will see a plus sign (+) on the graph at each place where
a milestone occurred (Figure 16). When you move the cursor over a milestone marker, the milestone region will be
updated with the name of the milestone and its timestamp.
330 ft.
Launched here (clock starts)
60 mph
1/8 mile
1000 ft.
1/4 mile
60 ft.
RPMs rise
after launch
RPMs drop
during launch
Figure 15: RPM replay — launch
A tall vertical bar marks where the G-tech began timing.
Thus, you can see what your RPMs were at launch, and even
for a brief period before launch.
The launch is the most crucial part of a run. The RPM
Note:
replay (p. 28) and G force graph (p. 33), can help you perfect
your launch technique and lower your times.
29
Figure 16: RPM replay — milestones
You must move the cursor over a milestone (from
Note:
either direction) to update the milestone region. If you move the
cursor near another milestone, but not over it, the milestone
region will not be updated.
Viewing Results
Each tic mark on the horizontal axis represents 1 second.
Each tic mark on the vertical axis represents 1000 RPM.
Assuming that you let off the throttle during a shift, by placing
the cursor at each peak in the graph, you can determine the
time and RPM value where you shifted into each gear.
G-TECH / Pro SS User Guide
29
Figure 17 shows how to use this graph to analyze the time
spent in each gear and how long each shift took.
Start of shifts (clutch disengaged, let off
throttle, RPMs drop)
3rd gear
HP Graph
The HP
graph
shows net horsepower throughout a run.
This is not the optimal graph for analyzing horsepower. It will
show artifacts around shift points that are due to factors
other than engine horsepower. It will also show the increasing effect of aerodynamic drag on the vehicle and the corresponding lower “net horsepower” as the speed increases.
2nd gear
1st gear
End of shifts (clutch re-engaged, re-apply
throttle, RPMs rise again)
.
Figure 17: RPM replay — shifts and gears
The graph resembles the one shown in Figure 18. Of course
the shape of the curve, as well as the numbers and ranges,
will be different for your vehicle.
You can determine how long a gear shift took by doing the
following:
• move the cursor to the right just until the RPMs begin
rising again and make note of the time
The difference between these times is the shift time. Your
vehicle actually slows a bit during shifts, so keep this time to a
minimum!
30
G-TECH / Pro SS User Guide
Horsepower
• place the cursor at a peak RPM value for one gear and
make note of the time
Cursor (current position)
Shifts
Figure 18: HP Graph
Change as
cursor
moves
Time
• As you move the cursor with
and , the horsepower and time values are adjusted to follow the cursor.
• Notice how this was a “3rd gear horsepower run”
because the user spent the most time in 3rd gear.
• Each tic mark on the horizontal axis represents 1 second.
• Each tic mark on the vertical axis represents 10 HP.
One of the most exciting features of the G-tech is its ability
to measure and graph your vehicle’s horsepower and torque
against an RPM range.
The G-tech’s Dyno plot provides you with a graph of
horsepower and torque throughout an RPM range in a single
gear. This is the “dyno plot” that everyone is accustomed to
seeing.
After you perform a run, the G-tech analyzes the data and
then creates a graph based on the gear in which maximum
horsepower was attained.
Note:
In order for you to get consistent HP & TQ graphs,
there is a special driving technique. This technique is different
than the driving technique you would use for a quick 1/4 mile!
Viewing Results
• Note the “dips” in measured horsepower on the 1-2
shift and the 2-3 shift. As soon as you push in the clutch
to shift, you decelerate (due to aerodynamic drag), and
there is no net horsepower delivered to the wheels.
Dyno plot
Please refer to “Horsepower, Torque & G-tech” on page 67 for
more information on optimal technique for performing horsepower runs.
31
G-TECH / Pro SS User Guide
31
You will see a graph such the one shown in Figure 19. Of
course the shape of the curve, as well as the numbers and
ranges, will be different for your vehicle.
You will notice a few things about Figure 19:
• The horsepower curve is drawn with a thick line; the
torque curve is drawn with a thin line.
• The peak horsepower and torque values are marked on
the graph
Peak Torque
Marker (+)
Peak Horsepower Marker (|)
Horsepower Cursor
HP & TQ
Torque Cursor
Horsepower
value at
cursor
RPM value
at cursor
RPMs
Torque
value at
cursor
Figure 19: Dyno Plot
• The graph has moveable cursors for HP and TQ. The
cursors move left and right using
and .
32
G-TECH / Pro SS User Guide
• The HP cursor rides along the HP curve, and the TQ
cursor rides along the TQ curve.
• As the cursor moves, the “RPM,” “HP,” and “TQ” values are updated to reflect the current cursor position.
• Each tic mark on the horizontal axis marks 1 second
G force graph
• Each tic mark on the vertical axis marks 0.1G of acceleration
This graph is useful for seeing how hard your vehicle was pulling when it was accelerating (positive Gs) and how hard it
was decelerating while braking (negative Gs).
Figure 21 highlights some other useful information on the
graph.
Accelerating
(Positive Gs)
Braking
(Negative Gs)
0Gs
Accelertation(Gs)
Cursor
Shifts
(Gs drop)
Time
Forward Gs at cursor
Vehicle
stopped
(0Gs)
Figure 21: Braking and accelerating
Time at cursor
Figure 20: G Force Graph
Some things to note about this graph:
Viewing Results
The G force graph shows the measured G force throughout a run. Larger G values indicate stronger acceleration.
• Positive G force means the vehicle is accelerating.
• Negative G force means the vehicle is decelerating
(shifting, coasting, braking).
• Use
and
to move the cursor. The G-force and
timestamp always pertain to the current cursor position.
33
G-TECH / Pro SS User Guide
33
• The brief dips are shift points. When you shift, you temporarily remove power, and this causes the vehicle to
decelerate briefly, until you re-engage the next gear.
• In a very powerful vehicle, or a traction-limited vehicle,
you may also notice dips in acceleration that are not due
to shifts. These dips are due to more power being
applied to the wheels than can be handled. The net
result is that the wheels spin and the vehicle does not
accelerate much.
• The large dip you see at the end of the graph is hard
braking at the end of the run.
• Notice at the end of the graph, Gs are zero. This is
because the vehicle came to a stop. Hence there is no
acceleration or deceleration.
60-0 Braking Distance
You can use the G-tech to measure 60-0 MPH braking distance. To measure your vehicle’s 60-0 braking distance:
• perform an acceleration run as usual (you do not need
to perform a full quarter mile, but make sure you reach
at least 60 MPH)
• when you are done accelerating, brake hard all the way
to a stop
If you do not brake to a complete stop at the end of
Note:
your run, and wait for the E.T. clock stop, you will not get a 60-0
MPH braking distance measurement.
The 0-60 results screen will also display the 60-0 braking distance as shown below. If you do not brake to a stop, the 600 braking distance is not shown on the results.
The 60-0 MPH braking distance is shown below the
0-60 MPH time if the run
was completed by braking
hard to a complete stop,
and then waiting for the
E.T. clock to stop.
34
G-TECH / Pro SS User Guide
Saved Runs
This section describes how to manage the runs that
are stored on your G-tech.
35
G-TECH / Pro SS User Guide
Saved Runs
5
35
The Saved Runs screen
Free
Memory
List of Top
10 Runs
The G-tech saves the last 30 runs you have performed.*
List of
All Runs
Cursor
Run Title
You can review your stored runs at any time by bringing up
the Saved Runs screen and choosing the run you wish to
review.
1
2
From the Main Screen, press
for the Main Menu
Up to 30 saved runs are listed under the “all runs” section.
Each “slot” represents a separate run.
Select “Saved
and press
The G-tech also lists the 10 best 1/4 miles (as determined by
E.T.) on the left hand side for quick and easy recall.
runs”
This will bring up the Saved Runs screen, shown in Figure 22.
*
The G-tech can store up to 300 seconds of racing.The G-tech also imposes
a limit of 30 runs total that can be stored, regardless of length. For example:
Run Length
20 seconds
15 seconds
10 seconds
5 seconds
36
Figure 22: Saved Runs screen
No. of Runs Stored
15 runs
20 runs
30 runs
30 runs
Seconds Stored
300 seconds
300 seconds
300 seconds
150 seconds
G-TECH / Pro SS User Guide
The amount of free storage memory remaining is shown in
the upper right-hand corner of the display. (As a guideline,
15-second run consumes approximately 5 percent of the free
memory.)
Use the navigation keys ( ,
cursor amongst the run slots.
,
and
) to move the
When the cursor is located on a slot with a run stored in it,
the run title is displayed at the bottom of the screen.
To review a run’s results, move the cursor to it and press
The appearance of each slot indicates its status, as shown in
Figure 23:
Filled
Empty
Selected
.
Top 10 run list
The 2 columns under the heading “top 10” represent the 10
fastest 1/4 mile runs as determined by E.T.
6 8
Filled
Empty
Shadow
1
2
5
Figure 23: Status of run slots indicated by appearance
• Filled (
• Empty (
) — slots that hold a saved run
) — slots that do not hold a saved run
• Selected (
or
) — the slot containing the cursor is in reverse video (there is always 1 selected slot)
• Shadow (
) — if the selected run is a top 10 run, the
shadow indicator corresponds to the same run in the
other list.
37
Figure 24: Run ordering of top-10 list
Every run listed in the top-10 list is also listed under “all runs”.
Saved Runs
The runs are ordered as shown in Figure 24.
Note:
There are 15 runs listed in “all runs”, but only 8 runs
in the “top 10” list. This indicates that only 8 of the 15 stored
runs were full 1/4 miles. The other 7 runs were stopped before
completing a 1/4 mile, and thus are not eligible for the “top 10”
list.
G-TECH / Pro SS User Guide
37
All runs list
Deleting saved runs
The 6 columns under the heading “all runs” represent all the
runs stored in the G-tech.
1
Move the cursor to the run you wish to delete.
This can be either a run in the “top 10” list, or the
“all runs” list.
If less than 30 runs are stored, some of the slots under “all
runs” will be empty.
Run to be deleted
The runs are ordered by date as shown in Figure 25.
1 is the newest run
1
6
11 16
26
15 is the oldest run
16-30 are empty
2
Press and hold
for approximately 2 seconds,
until a screen such as the following appears.
30
5 10 15
Figure 25: Run ordering of the “all runs” list
When the cursor is in the “all runs” region and positioned
over a run that is one of the ten best 1/4 miles, the run’s position in the “top 10” list will be indicated with the “shadow
run” indicator (
).
Choose
or
, then press
to finish.
Note:
To delete all runs, press and hold
for approximately 10 seconds in the step above. There is no undo!
38
G-TECH / Pro SS User Guide
Car Setup
Car Setup
6
This section explains the G-tech’s “Car Setup”
menu items.
39
G-TECH / Pro SS User Guide
39
4
Set redline / shiftlights
This section describes how to set the redline value in the Gtech, and how to enable/disable the shiftlights.
Setting the correct redline value for your vehicle is important
for proper RPM calibration and shiftlight operation.
The G-tech has a sequential shiftlight that illuminates the first
shiftlight LED when vehicle RPMs are 500 RPMs below redline. At 250 RPMs below redline, 2 additional LEDs turn on.
When the vehicle is at redline, all four LEDs blink rapidly.
1
2
3
40
From the Main Screen, press
Select “Car
Setup”
Select “Set
redline”
for the Main Menu
and press
, press
G-TECH / Pro SS User Guide
Use
to adjust the redline value in increments of 100 RPMs, then press
to continue.
5
Use
for
or
, press
to finish.
Note:
If you cannot control when your vehicle
shifts (e.g. automatic transmission), you may wish to
disable the shiftlights.
RPM calibration
Every vehicle has a unique electronic “RPM signature,” so the
G-tech must learn the RPM signature at different RPM levels
on your vehicle before it can measure and record RPMs.
Note:
Note:
The values you see in the following steps (such as a
redline of 6750) are not necessarily the same values you will see
during your own calibration. Do not worry - this is fine.
41
Setup”
3
Select “RPM
calibration”
4
and press
, press
The G-tech confirms that it has the correct value
for your vehicle’s redline. It is very important that
the G-tech is configured with the proper value for
redline prior to RPM calibration.
Set redline in the G-tech (page 40) prior to this step!
Note:
The steps documented here are current as of time of
printing. Future enhancements may cause a deviation from the
steps you see here... if so, just follow the on-screen instructions.
1
Select “Car
From the Main Screen, press
If the redline value is correct, select
press
. If not, select
and
Car Setup
Follow the steps below to calibrate the G-tech for your vehicle’s RPM signature. For additional information on RPM calibration, please see “RPM Calibration Tips” on page 66.
2
, enter the cor-
rect value for redline as described in the previous
section, and then continue.
for the Main Menu
G-TECH / Pro SS User Guide
41
5
6
7
42
Rev the engine to the requested RPM level and
hold it there. Then press
when vehicle RPMs
are steady at the requested value. Hold the RPMs
steady until the G-tech indicates it is done measuring.
Again match vehicle RPMs to the requested value,
and press
when vehicle RPMs are steady at the
requested value.
You will see a screen that indicates the RPM calibration procedure has been completed, and then
you will be returned to the previous menu.
G-TECH / Pro SS User Guide
Enter car weight
Note:
Vehicle weight must be set properly in order to obtain
accurate HP and TQ measurements. For help determining vehicle weight, please see page 72.
1
2
From the Main Screen, press
Select “Car
Setup”
3
Select “Enter
4
Move using
(Note: Press
for the Main Menu
and press
car weight”
, adjust using
, press
, press
for help during this process).
.
Pitch correction
Note:
The pitch factor depends on your vehicle’s suspension. For help determining the pitch factor, please see page 64.
From the Main Screen, press
Select “Car
Setup”
3
Select “Pitch
4
Adjust the pitch factor using
correction”
for the Main Menu
Car Setup
1
2
and press
, press
, press
Press
to increase
the pitch factor for vehicles with soft suspen-
The default pitch factor of 2.0
is fine for most vehicles.
(Note: Press
43
sions. Press
to
decrease the pitch factor for vehicles with stiff
suspensions.
for help during this process).
G-TECH / Pro SS User Guide
43
44
G-TECH / Pro SS User Guide
G-Tech Setup
This section explains the “G-Tech Setup” menu
items.
45
G-TECH / Pro SS User Guide
G-Tech Setup
7
45
LCD Contrast
US or Metric mode
The G-tech uses a Liquid Crystal Display (LCD) to display
information. You may want to adjust the contrast on the
LCD due to personal preferences, environmental conditions,
etc.
1
2
46
From the Main Screen, press
Select “G-Tech
Setup”
for the Main Menu
Select “LCD
4
Use
to adjust the contrast, and press
save changes and exit.
Contrast”
1
2
and press
3
and press
The G-tech can display units in U.S. units (feet, pounds, miles
per hour, etc.) or metric units (meters, kilograms, kilometers
per hour, etc.). The G-tech stores US and metric data on
every run, so even if you perform a run while in U.S. mode,
the G-tech is also monitoring and storing all the metric milestones as well.
.
to
G-TECH / Pro SS User Guide
From the Main Screen, press
Select “G-Tech
for the Main Menu
Setup”
and press
3
Select “US
4
Choose U.S. Mode or Metric Mode, then press
or metric mode”
, press
.
The following tables list the corresponding units and measurements for each mode.
U.S. unit
Metric unit
Weight
lbs
kilograms
Speed
miles per hour
kilometers per hour
Distance inches, feet
cm, meters
Power
horsepower
kilowatts
Torque
ft-lbs
newton-meters
U.S. Mode Measurement
Metric Mode Measurement
60 ft time
20m time
330 ft time
100m time
1/8 mile time and speed
200m time and speed
1000 ft time
300m time
1/4 mile time and speed
400m time and speed
0-60 MPH time
0-100 km/h time
1
2
From the Main Screen, press
Select “G-Tech
for the Main Menu
Setup”
and press
3
Select “Set
4
Move using
, adjust using
, press
.
5
Move using
, adjust using
, press
.
date and time”
, press
G-Tech Setup
Item
Set date and time
Figure 26: US and metric mode units and measurements
47
G-TECH / Pro SS User Guide
47
4
Set to factory defaults
Confirmation is required resetting to defaults.
This option restores the G-tech to the condition it was in
when it was shipped from the factory — it clears out all the
configuration information and stored runs.
Note:
Resetting the G-tech to Factory Defaults resets nearly
all the information stored in the G-tech. Perform this step only if
you are sure that you want to delete all configuration information and stored runs!
1
2
3
From the Main Screen, press
for the Main Menu
Select “G-Tech
Setup”
Select “Set
factory defaults”
to
and press
,
press
48
G-TECH / Pro SS User Guide
Use
to select either
then press
to finish.
or
, and
After you have performed this step, you will need to
Note:
perform the steps in “Quick Setup Before First Use” on page 10
before using your G-tech!
Mounting System
This section explains the G-tech’s mounting system.
In order to obtain accurate measurements, the Gtech must be mounted properly.
Please read this section carefully, it is very
important!
49
G-TECH / Pro SS User Guide
Mounting System
8
49
Mounting the G-tech
Assembling the Bracket
The G-tech is shipped with a sophisticated mounting system
that is used to hold the G-tech steady in your vehicle. This
section describes:
1
Insert Large Vacuum Nut into Mounting Bracket.
2
Insert suction cup into mounting bracket.
• the different pieces of the mounting bracket
• how to assemble the mounting bracket
• how to mount the bracket in your vehicle
Figure 27 shows the pieces of the G-tech mounting bracket.
Suction Cup
Large (Vacuum) Nut
Suction Cup
Release Tab
Mounting Bracket
Small
(Tensioning)
Nut
Mounting
Clip
Figure 27: Mounting bracket parts
50
G-TECH / Pro SS User Guide
3
Turn suction cup clockwise into the Large Vacuum
Nut until approximately 1/4 inch of threads protrude.
5
Turn Large Vacuum Nut counter-clockwise until it
touches Small Tensioning Nut.
1/4"
4
Place Small Tensioning Nut on threaded spindle,
and turn it clockwise a until it is snug on the stem.
There should be a small gap between the Small
Tensioning Nut and the Large Vacuum Nut.
6
Gently insert rubber ball of mounting clip into
mounting bracket. It should go in with very little
force and should fit snugly. If rubber ball does not
go in with little force, adjust tenisioning nut(s) until
it goes in easily. Do not force rubber ball into
mounting bracket, as this may deform / damage it.
Small Gaps
51
G-TECH / Pro SS User Guide
Mounting System
No Gap
51
Mounting the Bracket
1
3
Push the Large Vacuum Nut firmly towards the
windshield to expel all air between the suction cup
and the windshield. This is a very important step
to ensure proper operation of the mounting system.
4
At this point, the mounting bracket should stay
attached to the windshield when you remove your
hands. If it doesn’t, inspect the rubber suction cup
for cracks or tears, and make sure the windshield
surface is clean.
Find a place on your vehicle’s windshield where you
can mount the G-tech without affecting visibility.
Make sure the mounting area on the windNote:
shield is very clean and dry; otherwise, the mounting
bracket may not work properly.
2
Place the large rubber suction cup on the mounting
area of the windshield. Make sure there is a large
gap between the Large Vacuum Nut and the
mounting bracket.
AI
R
Large Gap
52
G-TECH / Pro SS User Guide
Turn the Large Vacuum Nut clockwise in order to
expel air and create a vacuum between the suction
cup and the windshield. Be sure to turn the Large
Vacuum Nut as far as possible.
U
U
VA
C
Tighten
Gap
6
The mounting clip should be steady and should not
move easily. If this is not the case, slowly turn the
Small Tensioning Nut counter-clockwise just
enough to secure the mounting clip.
Note:
You should only need to use the Small Tensioning Nut for fine adjustments the first time you
mount the G-tech. After the initial mounting, you
should secure the clip only by turning the Large Vacuum Nut clockwise to tighten it.
The clip should be completely rigid. A GNote:
tech which moves or vibrates during a run will provide
inaccurate results.
Loosen
53
G-TECH / Pro SS User Guide
Mounting System
M
5
53
7
Insert the small end of the power cord into the DC
jack, which is located on the back of the G-tech.
Plug the large end of the DC power cord into your
vehicle’s 12V cigarette lighter socket. The G-tech
will power on.
Note:
Some vehicles supply power to the 12V
socket only when the ignition is in the ACCESSORY
position or when the vehicle is running.
DC Power Jack
8
9
Note:
The G-tech does not have an ON/OFF
switch. Please be sure to unplug the G-tech when exiting your vehicle to avoid draining your vehicle’s battery.
Snap the G-tech into the mounting clip.
Note:
Please do not move the mounting clip if you need to
adjust the orientation of the G-tech! This will damage your
mounting system and will not be covered under warranty. To
safely re-orient the mounting clip, please refer to “Adjusting the
Bracket” on page 55.
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G-TECH / Pro SS User Guide
Adjusting the Bracket
It is very important that this technique be followed in order
to avoid damage to your mounting system.
3
Turn the Large Vacuum Nut clockwise until it is
snug and the mounting clip is held firmly in place.
Turn the Large Vacuum Nut counter-clockwise until
the mounting clip can rotate freely.
VA
C
U
U
M
1
Adjust the position of the mounting clip gently. If
the clip does not pivot easily, loosen the Large Vacuum Nut even more, otherwise you risk damaging
the ball portion of the mounting clip.
Turn Counterclockwise
55
Tighten
G-TECH / Pro SS User Guide
Gap
Mounting System
This section describes how to adjust the position of the
mounting clip for better viewing.
2
55
Removing the bracket
1
Turn the Large Vacuum Nut counter-clockwise until
it is snug up against the Small Tensioning Nut.
Turn Counterclockwise
2
Pull the suction cup’s small rubber tab gently away
from the windshield.
Tab
56
G-TECH / Pro SS User Guide
Advanced Testing
This section will show you how to use some of the
more advanced speed measurements of the G-tech.
57
G-TECH / Pro SS User Guide
Advanced Testing
9
57
Measuring 0-40 MPH, etc.
2
Select the 0-60 results menu choice and press
to view the Speed graph.
Suppose you want to measure the time it takes you to reach
a certain speed (say, 40 MPH) from a standstill. (In this example, we measure 0-40 MPH time, but you can use the same
procedure to measure the time it takes to reach any speed
you wish.)
1
58
Perform an acceleration run, making sure you hit
the speeds you want to measure.
In this example, we are measuring 0-40 MPH, so
we made sure the driver reached 40 MPH during
the acceleration run.
G-TECH / Pro SS User Guide
3
Notice how the speed (vertical axis) rises for a
while, and then falls again. This is because the vehicle braked to a complete stop at the end of the
run. For now (0-40 MPH), we only care about the
rising part of the graph, during acceleration from 0
to 40 MPH.
Use the
keys to move the cursor over the
40 MPH milestone on the rising part of the graph.
The 0-40 MPH time is displayed.
Measuring 50-70 MPH, etc.
Perform an acceleration run, making sure you hit
the speeds you want to measure.
In this example, we are measuring 40-60 MPH, so
we made sure the driver reached 60 MPH during
the acceleration run.
You may also wish to use this feature to measure the same
interval (e.g. 50-70 MPH) in several different gears. For example, many vehicles can cover 50-70 MPH in 2nd gear, 3rd
gear, 4th gear, and 5th gear. This measurement will tell you
which single gear is the best choice for this speed range.
Let’s suppose you want to measure your 50-70 MPH time.
This example will show you how to use the G-tech to do it.
You can measure any interval you wish using the proNote:
cedure described below — we have just chosen 40-60 MPH for
this particular example.
59
2
Select the 0-60 results menu choice and press
to view the Speed graph.
G-TECH / Pro SS User Guide
Advanced Testing
Suppose you want to measure a vehicle’s acceleration at
highway speeds (sometimes referred to as a “passing test”).
This test is often done in the vehicle’s top gear (5th or 6th
gear in most vehicles) to measure how well the vehicle can
accelerate on the highway without downshifting.
1
59
3
60
Notice how the speed (vertical axis) rises for a
while, and then falls again. This is because the vehicle braked to a complete stop at the end of the
run. For measuring the 40-60 MPH acceleration
time, we only care about the rising part of the
graph, during acceleration from 40 to 60 MPH.
Use the
keys to move the cursor over the
40 MPH milestone on the rising part of the graph.
Press
and a box will be drawn around the 40
MPH milestone. Since the cursor is still on 40 MPH,
a 40-40 MPH time of 0.000 is displayed.
G-TECH / Pro SS User Guide
4
Now use the
key to move the cursor over the
60 MPH milestone on the rising part of the graph.
Since the cursor is now on 60 MPH, the 40-60
MPH time is displayed.
Measuring 0-60-0, 0-100-0, etc.
5
Select the 0-60 results menu choice and press
to view the Speed graph.
The G-tech provides you with all the tools you need to perform this test!
1
Stage the G-tech and launch your vehicle
(page 18).
2
3
4
Accelerate up to the desired speed.
61
6
Notice the “upside down V” shape to the curve.
Use the
key to move the cursor all the way to
the right hand side of the screen. In this case, the
driver actually went up to 61 MPH, so we get the
0-61-0 time, which is displayed on the bottom line.
Immediately brake hard, all the way to a stop.
Keep the vehicle at a stop until the E.T. clock stops
counting (about one second once you have completely stopped).
Advanced Testing
Suppose you want to perform a 0-60-0 MPH timed measurement... how quickly can your vehicle reach 60 MPH, and how
quickly can it bring the vehicle back to a stop?
Note:
You can use this same procedure to measure acceleration and braking to any speed, such as 100 MPH.
G-TECH / Pro SS User Guide
61
62
G-TECH / Pro SS User Guide
More info
More info
10
Additional detailed information and tips.
63
G-TECH / Pro SS User Guide
63
Rollout
Determining your pitch factor
The rollout distance is the distance that the vehicle moves
before the E.T. clock starts timing. This is exactly what happens at a dragstrip.
By matching the rollout distance you use at the track to the
rollout distance used by the G-tech, your times will be very
close to those measured with the track’s equipment.
The G-tech uses a roll-out distance of 12 inches. In other
words, the G-tech starts timing when your vehicle has moved
12 inches.
At a dragstrip, to achieve a rollout of approximately 12
inches, you would creep your vehicle forward little by little,
just until the stage bulb is lit. Once the stage bulb comes on,
stop moving your vehicle forward immediately. This is called
“shallow staging”, because your vehicle barely “dipped its
toe” into the staging area.
Had you continued to move your vehicle forward a few
more inches (but not enough to un-block the stage beam),
your vehicle would have been “deep staged.”
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G-TECH / Pro SS User Guide
“Vehicle pitch” is the up and down movement of the front
(and back) of your vehicle during acceleration.
You may be aware that under strong braking conditions,
most vehicles experience “nose dive.” By the same token,
most vehicles experience a slight raising of the front end
under strong forward acceleration. You may not even notice
it. But this motion means the G-tech’s measurements require
slight adjustments to obtain the highest accuracy.
The G-tech has an adjustable “pitch correction factor” that
allows you to fine tune the G-tech’s accuracy. You must set
the pitch factor correctly to ensure the best accuracy.
Typical cars have a pitch correction factor of approximately 2
degrees per forward G of acceleration, and this is the default
setting. Most cars will not require any adjustment at all. If you
have particularly stiff suspension, lower the pitch factor. If you
have a very soft suspension, consider raising it.
You can take the guesswork out of determining this value by
going to your local dragstrip and doing a few runs while using
the G-tech.
First, you must set your pitch correction factor to 0.0, or the
following procedure will not work! (The default pitch correction factor is 2.0).
Example: Determine the correct pitch factor when the G-tech
indicates a trap speed of 104.0 MPH and the track ticket gives
a trap speed of 100.3 MPH.
Perform a run at a dragstrip with the G-tech. Then you will
have the track speed from your racing ticket and the G-tech
trap speed from the G-tech results.
Trap Speed- – 1 × 57.3
Pitch Factor =  Gtech
------------------------------------------
Track Trap Speed
Trap Speed – 1 × 57.3
Pitch Factor =   Gtech
--------------------------------------------
  Track Trap Speed

The above formula assumes that the G-tech’s trap
Note:
speed is always greater than the trap speed from the track
timeslip, which it almost always is. If the G-tech’s trap speed is
lower than the timeslip’s trap speed, use a pitch correction factor
of 0.0.
The following example shows how to calculate the pitch correction factor for a real-world situation.
65
= ( 1.03689 – 1 ) × 57.3
= ( 0.03689 ) × 57.3
= 2.1
After you enter a pitch factor of 2.1 into your G-tech for this
vehicle, the G-tech traps speeds will agree more closely with
the track timeslip.
More info
Your pitch correction factor can be calculated by the following formula:
=  104.0
------------- – 1 × 57.3
100.3
Even with proper pitch correction, G-tech E.T.s may
Note:
not agree closely with the timeslip unless you shallow stage!
Changes to your vehicle’s suspension, weight distribution, etc.
can affect the pitch correction factor. Also, not all dragstrips
are as level as they seem. This can also have small effects on
your pitch correction factor on different terrains.
G-TECH / Pro SS User Guide
65
RPM Calibration Tips
The G-tech monitors vehicle RPMs constantly. In order to
accurately convert your vehicle’s electrical signature to RPMs,
however, you must first perform an “RPM calibration”
(page 41).
You can perform the RPM calibration while the vehicle is stationary or while it is moving (in gear).
The only thing that matters during RPM calibration is that the
vehicle RPMs are stable (unchanging) and that they are at the
value requested by the G-tech.
This means that if the G-tech instructs you to rev the engine
to 4000 RPM and press , make sure the RPMs are steady
right at 4000 RPM before pressing . The more careful you
are during calibration, the better your RPM readings will be.
66
case, you should have assistance from a passenger. You can
calibrate the RPMs when the vehicle is moving in gear, or in
neutral and stopped, so long as the RPMs are at the specified
level.
Vehicles with automatic transmissions might need to be
placed in first gear to keep the transmission from upshifting
during the High RPM calibration.
Some vehicles have a very faint RPM signal. If you have performed an RPM calibration but the G-tech tachometer does
not accurately represent your RPMs, your vehicle might fall
into this category.
On these vehicles, you may have better results by turning on
some of your electrical systems (such as the headlights,
defroster, or fan) during the RPM calibration process. If you
do this, however, you should keep these systems powered
when using the G-tech as well.
Some vehicles will allow you to rev the engine to redline
while parked; others have a rev limiter that kicks in early
(such as at 3000 RPM) when the vehicle is not moving.
Another point of note: with many vehicles, the RPM signal is
very weak below 1000 RPMs (even 1500 RPM on some vehicles). If this is true of your vehicle, at low RPMs the G-tech
will register the default value of 750.
If your vehicle rev limiter kicks in early while stopped, you will
need to calibrate your RPMs while moving in gear. In this
During the RPM calibration process, the G-tech suggests certain RPM values to use (e.g., 4000 RPM and 2000 RPM).
G-TECH / Pro SS User Guide
These suggestions are based on what you input for your vehicle redline.
In all but a few cases, the suggested RPM values will provide a
good RPM calibration. If you are not pleased with how well
the G-tech is measuring RPMs after a calibration, the G-tech
will allow you to change the two RPM calibration points.
For example, during RPM calibration, the first screen may
come up as such:
If you would like to calibrate at 6000 RPMs instead of 4000
RPMs, just press
twice to change the “4000” to a “6000”,
and then rev your engine to 6000 RPMs and press .
67
This section provides detailed information on the G-tech’s
horsepower & torque measurements and some guidelines
and tips to help you get repeatable results.
The G-tech does not measure engine horsepower at the crank,
which is what the automobile manufacturers and magazines
typically report.
The G-tech does not measure wheel horsepower either (a
dyno measures wheel horsepower). As you may know, wheel
horsepower always measures lower than engine horsepower,
since it includes drivetrain loss, the rolling resistance of the
tires on the road, and other factors.
More info
For example, for a vehicle with a redline of 6500 RPM, the Gtech may suggest revving to 4000 RPM for the high value, but
you are free to change this number to a larger number, like
6000 RPMs, during the calibration process.
Horsepower, Torque & G-tech
The G-tech measures net horsepower, which reads even
lower than wheel horsepower. The G-tech’s net horsepower
value is a measurement of all the horsepower that is available
to accelerate your vehicle after all power losses have been
subtracted.
As one example, on a dyno, the vehicle is not experiencing
any aerodynamic drag (“wind resistance”) because it is not
actually moving through the air — it is stationary on rollers.
G-TECH / Pro SS User Guide
67
However, in the “real world” (i.e., at the track), your vehicle
has to contend with issues such as aero drag.
Suppose that two vehicles with identical engines, drivetrains,
and tires go to the same dyno. One vehicle has been modified to minimize aerodynamic drag. They both go to the dyno
in town and measure identically.
On the G-tech, the vehicle that is more aerodynamic will
measure a higher net horsepower, because it loses less power
due to aerodynamic drag on the track.
The driving technique for horsepower and torque measurements
differs from the technique for obtaining the best 1/4 mile results.
We will describe the technique here and then provide some
supporting information afterwards.
1. Stage the G-tech just as you would for a 1/4 mile run.
Wait for the “Launch when Ready” message.
2. At a moderate RPM value, start your vehicle briskly off
the line, enough to trigger the G-tech and start its clock.
Don’t launch as hard as you would for a quarter mile.
For example, if your vehicle redline is 6000 RPM, launch
at 1500 to 2000 RPM.
3. Shift out of 1st gear before you are halfway to your
vehicle’s redline. So if your vehicle has a 6000 RPM redline, shift to 2nd before you reach 3000 RPM in first
gear. Be sure to let off the throttle between shifts, i.e.,
while the clutch is not fully engaged, and be sure to shift
smoothly and avoid jerks.
4. As soon as 2nd gear is fully engaged (which should be at
a low RPM, since you shifted out of 1st gear very early),
floor the accelerator. Keep the “pedal to the metal” until
your vehicle’s redline.
5. This allows you to cover a very wide RPM range in 2nd
gear at full throttle. Don’t worry about the fact that you
aren’t in the “sweet spot” of your power band when
you first shift into 2nd gear. That’s the point: we’re measuring the power over the whole RPM range.
6. Once you reach your upper RPM value (e.g. redline) in
2nd gear, shift into 3rd gear and accelerate briefly
(maybe one second or so.) This does not have to be
full-throttle, since we are using 2nd gear for our horsepower measurement.
7. At this point, you can press
to stop the G-tech from
measuring, or just coast (foot off accelerator). The Gtech will stop its clock.
8. Now you can view the dyno plot (p. 31).
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G-TECH / Pro SS User Guide
• There is significantly less wind drag in 2nd gear as
opposed to 3rd gear; that is the reason we chose 2nd
gear in this example.
• No matter which gear you do your runs in, be sure to
use the same gear for all runs you wish to compare.
Suppose you do a 2000-7000 RPM run in 2nd gear and
another run from 2000-7000 RPM in 4th gear. The run
in 4th gear was at a much greater speed, and hence the
aero drag was much greater. This will have the effect of
lowering the net horsepower on the 4th gear run.
• Vehicles with extraordinary power, or poor traction,
may spin the wheels at full-throttle in 2nd (and even
later) gears. The G-tech horsepower measurement
relies on no wheelspin being present, just like a chassis
dyno. If your vehicle experiences wheelspin in 2nd gear,
please perform the run in 3rd (or 4th...) gear.
• Do multiple runs and average the results for the most
accurate and repeatable numbers.
69
• Vehicle weight is factored into the horsepower calculation. This number should be as accurate as possible.
Refer to “How much does my vehicle weigh?” on
page 72 for more information on vehicle weight.
• External environmental conditions such as wind, air temperature, and humidity affect net horsepower. The same
vehicle with the same driver will measure more net
horsepower at 32 degrees Fahrenheit than it will at 100
degrees Fahrenheit. Cold air is more dense, and hence
contains more combustible oxygen. That’s why your
vehicle feels so much stronger when it’s cool outside!
• Cars with Continuously Variable Transmissions (CVT)
might be a problem, as the G-tech relies on gear shifts
and broad RPM ranges when determining peak horsepower and torque. For these situations, you can use the
G-tech’s Horsepower vs. Time graph to find the peak
horsepower.
More info
• Shop dyno testing is often done in 4th gear, because in
many cars, 4th gear provides a 1:1 gear ratio with the
least amount of driveline loss. However, using 4th gear
for dyno testing with the G-tech is usually not practical
(and certainly not necessary) because of high speed and
large aero drag.
• With the G-tech, repeatability and tuning is the goal, not
necessarily comparisons to magazines or dynos.
• Ensure your RPMs are calibrated properly and working
throughout the entire RPM range before doing a horsepower run. Otherwise your torque values will be
skewed.
G-TECH / Pro SS User Guide
69
Self-leveling the G-tech
Tips for improving Accuracy
Note:
The G-tech must only be used on flat, level ground.
Any slope, bump or grade in the surface may cause inaccuracies.
• Do your acceleration runs on a very flat / level track.
Even a gentle slope may cause your readings to be off.
Note:
When the G-tech is mounted in your vehicle and the
vehicle is stopped on flat, level ground, the G-Value will be very
small. If not, you should “self-level” the G-tech (described below).
• Avoid measurements on windy days. A tail wind will
artificially lower your time and increase your measured
horsepower. A head wind will artificially increase your
time and lower your measured horsepower.
Every time you do an acceleration run, the G-tech automatically self-levels. Thus, to self-level the G-tech, simply perform
a brief acceleration run (page 18). You need only go far
enough to trigger the G-tech and start the E.T. clock — just a
few feet.
At this point, you can press
to stop the G-tech from measuring, or just coast (foot off accelerator). Either way, the Gtech will stop its clock. If you are careful to go less than 60
feet forward, the run will be automatically discarded, otherwise you may wish to go into your Saved Runs and discard
the newest run (page 38).
Once you have done this, be sure to not move the G-tech
mounting clip. You G-tech is now self-leveled.
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G-TECH / Pro SS User Guide
• Do several runs in both directions to average out the
effects of slope and wind.
• Ensure that the G-tech is not loose in its mounting
bracket and also make sure the mounting bracket is
firmly installed.
• A smooth, strong launch will typically yield the most
repeatable measurements. A jerky or violent launch
might cause the G-tech to trigger before or after you
intend.
• When doing a braking test, bring the vehicle to a complete stop and wait for the E.T. clock to stop counting. If
you begin moving again before the E.T. clock stops, you
may not be able to view braking distance results.
• To get the results closer to the track timeslip, shallowstage and fine-tune your pitch correction factor (p. 43).
• When trying to measure horsepower and torque,
please follow the procedure in the manual very closely
(p. 67)
Bypassing the Boot-up screen
When the G-tech is first turned on and initializing, an image
of a car gradually appears on the screen.
As you analyze your runs with the G-tech and measure your
horsepower and torque vs. RPMs (p. 31), you may determine
that the best shiftpoint is not at vehicle redline, but at a different value.
71
Figure 28: G-tech screen during power-on initialization
If you wish to by-pass this altogether, simply press
G-TECH / Pro SS User Guide
.
More info
• Avoid leaving your G-tech in any extreme temperature
conditions. Extreme temperatures will not affect the
physical appearance but may impact the accuracy of the
G-tech’s accelerometer calibration. Examples of
extreme temperatures could include freezing outdoor
temperatures and car interiors in direct summer sunlight.
71
Version and serial number
How much does my vehicle weigh?
If you need to determine the configuration information of the
G-tech (such as the firmware version or unit serial number),
follow this procedure.
• Before applying power to the G-tech, press and hold
the
button.
• While keeping the
button pressed, apply power.
• Wait for a screen to appear that gives configuration
information about the G-tech.
• Once the screen appears, you may release the
ton.
but-
• After viewing the version information, you may press
to continue.
In order to calculate meaningful horsepower measurements,
you must provide an accurate value for your vehicle’s weight.
In this manual, the term “vehicle weight” refers to all the weight
that is supported by the vehicle’s tires (including the tires themselves). So this includes the driver’s body weight, fuel weight,
tools, fast food wrappers, etc.
If you are fortunate enough to have access to an accurate
vehicle scale, go ahead and weigh the vehicle as it would be
equipped at the track (i.e., with you in it, the correct amount
and type of fuel in the tank, etc.)
Some tracks even have scales available for weighing your
vehicle. Also, some towns have dumps or refuse collection
areas with large scales that you may be able to use. Moving
companies may have vehicle scales as well.
If you can’t weigh your vehicle, estimate it. Use the manufacturer’s data to obtain vehicle weight (from the Owner’s Manual or the Internet). Then adjust the weight based on the
difference between your car as it was stock, and as it is now
(Have you added a heavier stereo? Have you removed the
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G-TECH / Pro SS User Guide
spare tire?). Don’t forget to include your own body weight
and the fuel as well.
You do NOT want to use the Gross Vehicle Weight Rating
(GVWR) value that is provided in the vehicle door jamb as
the actual vehicle weight.
A rough rule of thumb to estimate your vehicle weight from
the GVWR exists, but don’t rely on it being too accurate.
Again, this is a very ROUGH rule of thumb... each manufacturer calculates GVWR in its own way...
The rule of thumb is to take the passenger capacity of the
vehicle (e.g., 5 for a mid-sized sedan) and subtract from the
GVWR 180lbs for each missing person.
Example: Suppose GVWR = 4200 lbs, vehicle capacity is 5
people, but we have only a driver. Thus there are 4 missing
passengers, which means we subtract 4x180lbs. The value
4200 lbs - 720lbs = 3480 lbs. Thus you would enter 3480 lbs
into the G-tech for vehicle weight.
73
As you use the G-tech and become more familiar with all of
its features, you might be interested in expanding its capabilities. The RR model of the G-tech has some features that you
might find of interest. Please visit www.gtechpro.com for
information on upgrading your G-TECH/Pro SS to an RR.
With the RR upgrade, you can use the G-tech as a dataacquisition system. G-TECH/Pro RR can upload race data to
a computer running G-tech PASS (Performance Analysis System Software), allowing you to overlay and compare runs
and get very detailed information about your measurements.
Are you a Road Racer or a Solo (autocross) enthusiast? If so,
the RR (Road Racer) is the right choice for you. Log over two
hours of racing sessions and review the data later in G-tech
PASS. This is what the professional teams do, only their
equipment costs much more.
More info
GVWR is the fully-loaded vehicle weight with passengers.
Thus, GVWR is always higher than the actual vehicle weight,
and if you enter GVWR instead of actual vehicle weight, your
horsepower numbers will be artificially inflated.
Getting more from your G-tech
If you use the G-tech in more than one vehicle you will be
able to store up-to four cars and easily switch between them.
For more information on upgrading, and to stay up-to-date
with new developments, visit www.gtechpro.com.
G-TECH / Pro SS User Guide
73
Contact info
Tesla Electronics Main Company Website:
http://www.gtechpro.com
G-tech Technical Support:
http://www.gtechpro.com/support.html
G-tech Discussion Forums:
http://www.gtechproforums.com
Company Contact Information:
Tesla Electronics, Inc.
G-tech Division
1749 14th St.
Santa Monica, CA 90404
Phone: (310) 452-0030
Fax: (310) 452-0078
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G-TECH / Pro SS User Guide
Index
0-100-0 time, 61
0-60-0 time, 61
50-70 MPH time, 59
Booting, 71
Braking Distance, 34
Cables, 9
Contact Information, 74
Contrast, LCD, 46
Data Logging, 73
Deep Staging, 64
Drag Runs
see Acceleration Runs
Dyno Plot, 31
Factory Defaults, 48
Firmware version, 72
75
Index
Acceleration Runs
Performing, 18
see also Stored Runs
G force
Graph, 33
Peaks, 16
G Peaks
Resetting, 16
Viewing, 16
Graphs
Braking Distance, 34
G force, 33
HP & Torque vs. RPMs, 31
HP graph, 30
Overview, 25
RPM replay, 28
Speed graph, 27
Horsepower
Graph, 30
Graph vs. RPMs, 31
Wind Effects, 70
Icons, 9
LCD Contrast, 46
Main Menu, 9
Main Screen, 14
G-TECH / Pro SS User Guide
75
Metric mode, 46
Mounting System
Assembling, 50
Mounting In Vehicle, 52
Parts, 50
Removing, 56
Top 10, 37
Self-Leveling, 15, 70
Serial Number, 72
Shallow Staging, 64
Shiftlights, 40
Staging, 64
Passing Test, 59
Pitch Correction
Calculating, 64
Factor, 43
Tachometer, 14
Torque
Graph vs. RPMs, 31
Units (US or Metric), 46
Upgrade, 73
Quick Reference, 11
Quick Setup, 10
Version, 72
Redline, 40
Road Racing, 73
Rollout, 64
RPMs
Adjusting Calibration Points, 66
Calibrating, 41
Calibration Tips, 66
RR model, 73
Weight
Entering, 42
Estimating, 72
Horsepower Calculations, 69
Saved Runs
Capacity, 36
Deleting, 38
Reviewing, 36
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G-TECH / Pro SS User Guide
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