BigStuff3 4 Stage Dry Nitrous (NOS) System Set Up

BigStuff3 Four (4) Stage Dry Nitrous System
GEN3 PRO SEFI System
Four (4) Stage Dry Nitrous System
User Instruction Manual
Version 1.0 – February 2011
1
BigStuff3 Four (4) Stage Dry Nitrous System
Introduction
Thank you for purchasing BigStuff3’s GEN3 PRO SEFI four (4) stage dry nitrous system. The
system described in this User’s Manual is targeted for race applications only using the Alpha/N
control algorithm within the GEN3 ECU. A street version will be available in the summer of
2011.
The GEN3 PRO SEFI four (4) stage dry nitrous system is available in two configurations as
described below. The preferred system configuration must be specified when ordering.


Four stage nitrous and spark control via the GEN3 ECU, and BigComm software.
Four stage nitrous (only) control via Digi-set timing controllers. The Digi-set controllers
allow for last second adjustability in the staging lanes (Digi-set timers sold separately).
The spark retard for each stage remains under the control of the GEN3 ECU.
Note: When using Digi-set timers, extreme care must be taken to ensure that the spark retard
timing tables and the Digi-set timers are configured to work together.
Before Installing
This manual is a supplement to the GEN3 System User’s Manual. The GEN3 system needs to be
installed in the vehicle as described in the GEN3 System User’s Manual.
System Contents
The ECU, supplied with the four (4) stage NOS system, will include two (2) header connectors at
each end of the ECU housing. It is essential that the NOS harness connector be installed in
the correct header location. Not installing the NOS header connector into the correct
header location will damage the ECU and void the warranty!! The header connector (header
2) on the GEN3 ECU will be marked “NOS”. The harness side NOS header will also be marked
“NOS”. Mate the matched “NOS” connectors together. The remaining NOS functionality is
contained within the GEN3 ECU.
The header connector
will be marked ““NOS”
to indicate where to
connect the NOS header
connector.
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BigStuff3 Four (4) Stage Dry Nitrous System
NOS System Installation Overview
BigStuff3’s Four (4) Stage Dry Nitrous system was designed to turn on nitrous solenoid valves
(via relays), in a user defined timed sequence. The additional fuel required, when the nitrous
solenoids are turned on, is added through the injectors already present in the system.
Note: Once the NOS system is activated, fuel and spark are controlled using the simple
graphs described below.
Wiring the Relays to Control the Nitrous Solenoids
Note: The relays, used to activate the nitrous solenoids for each stage of nitrous, must be
wired to the NOS header connector in the exact order (stages 2 – 4) shown below to avoid a
mismatch between the spark retard tables and each stage of nitrous.
Note: If the GEN3 system is being upgraded to the four (4) stage nitrous system, the data log
trigger will now be activated from pin Y2 in header 2. The new data log trigger wire is included
in the wire harness provided with the NOS system upgrade. The “Timer Enable” wire will
remain in pin A of the boost connector and must be wired per the Timer Enable/Clutch wiring
diagram shown below.
The diagrams below show how to wire the relays into the system. Relays are required to activate
the nitrous solenoid valves. BigStuff3 recommends using solid state relays for increased speed
and reliability. Solid state relays are available from BigStuff3. Call BigStuff3 for more details.
One (1) of two (2) wiring configurations will be used based depending on whether the GEN3
ECU internal timers, or Digi-set timers will be used to activate the nitrous solenoids.
Solenoid Wiring using the GEN3 ECU for Spark Control & Nitrous Control
The following diagram illustrates how to wire the nitrous solenoids when the GEN3 ECU will be
used to control the nitrous solenoid timing/activation and the spark retard for each stage of
nitrous used.
The four (4) way “Boost” connector shown in the diagram is part of the GEN3 main wire harness
and is labeled “Boost” The GEN3 NOS system includes a wire harness/header connector labeled
“NOS”. This connector will mate to the ECU header connector also labeled NOS.
The NOS wire harness will have 5 wires in the header connector. If the GEN3 ECU is going to
be used to control the nitrous solenoid timing/activation and the spark retard for each stage of
nitrous, only the wires labeled “data log trigger” (Y2) and “BS3 Stage 4” (P2) will need to be
connected as shown below. The wires labeled X1, X2 and X3 are used in the Digi-set timer
configuration and therefore will not be used.
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BigStuff3 Four (4) Stage Dry Nitrous System
BigStuff3 4 Stage Nitrous Solenoid Wiring - Using the GEN3 Internal
Spark & Nitrous Control and Solid State Relays
Dual State Clutch Switch
12V
Boost Connector from Main
Wire Harness
With Clutch IN
– 12V is
supplied to the
optional
systems wire
GEN3 ECU Header 2 - Terminals L - Y
L
M N
P
R
S T
W X Y
Row 1
A
With Clutch
OUT – 12V is
supplied to the
Timer Enable
Input
B
C
D
Row 2
Row 3
Y2, Data Trigger Wire
Timer Enable Wire
Battery 12V
Switched 12V
Input
Input
1
2
1
2
Output
Stage 1
tex
t
3
2
Output
3
1
2
tex
t
tex
t
1
Stage 4
tex
t
tex
t
Ground
tex
t
tex
t
Nitrous Solenoid
Nitrous Solenoid
Ground
4
Output
Stage 3
Nitrous Solenoid
Ground
Input
4
Output
Stage 2
tex
t
Nitrous Solenoid
Ground
Input
4
Solid State Relay
3
Solid State Relay
4
Solid State Relay
2
Solid State Relay
3
Solenoid Wiring using the GEN3 Spark Control & Digi-set Nitrous Control
The following diagram illustrates how to wire the nitrous solenoids when the GEN3 ECU is
going to be used to control the spark retard for each stage of nitrous and Digi-set timers will be
used to control the nitrous solenoid timing/activation.
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BigStuff3 Four (4) Stage Dry Nitrous System
The four (4) way “Boost” connector shown in the diagram is part of the GEN3 main wire harness
and is labeled “Boost” The GEN3 NOS system includes a wire harness/header connector labeled
“NOS”. This connector will mate to the ECU header connector also labeled NOS.
The NOS wire harness will have 5 wires in the header connector. In this configuration only the
wires labeled “data log trigger” (Y2), Digi-set Stage 2 (X1), Digi-set Stage 2 (X2) and Digi-set
Stage 3 (X3) will need to be connected as shown below. The wire labeled “BS3 Stage 4” (P2)
will not be used.
BigStuff3 4 Stage Nitrous Solenoid Wiring – Using Digi-set Timers and
Solid State Relays
A
With Clutch
OUT – 12V is
supplied to the
Timer Enable
Input
B
C
X1
D
X2
GEN3 ECU Header 2 - Terminals L - Y
L
M N
P
R
S T
W X Y
X3
Row 1
Timer Enable Wire
Row 2
Row 3
Y2, Data Trigger Wire
Battery 12V
To P2
Switched 12V
Input
2
1
2
Output
1
2
tex
t
tex
t
tex
t
tex
t
Ground
tex
t
tex
t
Nitrous Solenoid
text
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Stage 4
Nitrous Solenoid
Ground
4
Output
Stage 3
Nitrous Solenoid
Nitrous Solenoid
Ground
3
Output
Stage 2
tex
t
Input
4
Solid State Relay
1
Stage 1
tex
t
3
2
Output
text
Ground
Input
4
Solid State Relay
3
Solid State Relay
Solid State Relay
2
4
text
Input
3
text
Dual State Clutch Switch
BS3 Boost Connector
from Main Wire Harness
Digi-set Timer
Stage 4
With Clutch IN
– 12V is
supplied to the
optional
systems wire
Digi-set Timer
Stage 3
Digi-set Timer
Stage 2
12V
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BigStuff3 Four (4) Stage Dry Nitrous System
Clutch Input Wiring
The clutch input wiring, required to activate the four (4) stage dry nitrous system, is shown in the
diagram below. Ignore the 2-Step input below if the system does not include BigStuff3’s
optional 2-Step RPM launch control.
In order to activate the staged NOS control, 12 Volts must be applied to the “Timer Enable”
wire, when the clutch is released. The “Timer Enable” input is Pin A of the 4-way Boost
connector in the main wire harness. An ON/OFF switch can be added between clutch switch and
the Pin A of the Boost connector to allow the timer enable input pin to be turned on and off.
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BigStuff3 Four (4) Stage Dry Nitrous System
BigStuff3 - Data Log Trigger/Timer Enable - Wiring Diagram
Using a Dual State Clutch Switch
This harness/header connector is supplied
with the NOS system upgrade.
Switched 12V Source in the
Vehicle
GEN3 ECU Header 2 - Terminals L - Y
L
M N
P
R
S T
Required On/
Off Switch
W X Y
Row 1
Row 2
Y2, Data Trigger Wire
Row 3
With Clutch IN –
12V is supplied to
the optional
systems wire
W1, Optional 2-Step Wire
Boost Connector from Main
Wire Harness
A
B
C
With Clutch OUT
– 12V is supplied
to the Timer
Enable wire
D
L2, Timer Enable Wire
Optional ON/
OFF Switch to
turn the “Timer
Enable” signal
On and Off.
Version 1.0 – February 2011
Dual State
Clutch Switch
7
BigStuff3 Four (4) Stage Dry Nitrous System
Configuring the NOS System
From the main BigComm screen, go to NOS.
When the drop-down screen opens, select “NOS parameters”, as shown below.
NOS Parameters Configuration
Up to 4 stages
can be selected
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BigStuff3 Four (4) Stage Dry Nitrous System
The “NOS Parameters” table defines:


When the system will become active, via the minimum RPM and TPS setting.
When each stage (nitrous solenoid) will turn on.
The four “Stage Timer” cells in the table allow the user to define the time intervals between the
stages. From one (1) to four (4) stages can be used.
Using the parameters shown in the “NOS Parameters” table below, the system will activate
when:





The engine RPM exceeds 4,500 RPM
The Throttle Position Sensor (TPS) exceeds 80%
12V is applied to the Timer Enable wire via the clutch switch (see diagram above).
There must be a timer value in all four (4) “Stage Timer” cells, even if all four stages are
not being used. For example, if only two stages are being used, stage timer one (1) is set
for one (1) second, stage timer two (2) is set for four (4) second and stage timers 3 & 4
are set at zero seconds the system will not activate.
The timer values in all four (4) “Stage Timer” cells must grow in duration. For example,
if stage one has a timer value of one (2) second, and the stage two (2) timer has a value of
one (1) second, the system will not activate.
NOTE: If 12V is not applied to the “Timer Enable” wire, the minimum TPS and RPM
parameters are not met, and the Stage Timers are not configured as defined above, the NOS
system will not become active!
Once all these criteria are met, the stages will respond as follow:




Stage 1 will be activated one (1) second after 12V is applied to the Timer Enable wire
(the clutch is released).
Stage 2 will be activated three (3) seconds after 12V is applied to the Timer Enable wire.
Stage 3 will be activated four (4) seconds after 12V is applied to the Timer Enable wire.
Stage 4 will be activated seven (7) seconds after 12V is applied to the Timer Enable wire.
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BigStuff3 Four (4) Stage Dry Nitrous System
The RPM axis, for both the Spark and Fuel Control Graphs, is configured using the NOS axis
configuration table below.
NOS Axis Configuration Table
NOS Staged Fuel & Spark Control Graphs
Once the criteria defined in the “NOS Parameters” are met, and the nitrous system is
activated, the GEN3 ECU will ignore the base fuel and spark maps and complete control
(of the fuel and spark) is handled per the settings (curves) in the Fuel and Spark graphs.
NOS Staged Fuel Control Graph
Use the left mouse button to drag the lines (representing each stage) in the graph to the desired
value. The Y axis of the Fuel Control Graph represents fuel flow in pounds (lbs) per hour.
When the mouse button is released, the software will provide the following information for that
point in the graph:
 The injector duty cycle
 Fuel flow in lbs/hr
 Engine RPM
The new fuel flow value will be updated in the graph once the mouse button is released.
BigStuff3 recommends saving your changes as you go along. Go to the GEN3 system User’s
Manual for information on how to save changes.
The firmware supplied with the four (4) stage nitrous system was configured based on eight
(8) 160 lb/hr Bosch injectors at 80 PSI of rail pressure, which equates to 2230 cc/min w/0.5
mS injector opening time. The injector flow rate input is configured in the Operating
Parameter Configuration table in the BigComm software as shown below.
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BigStuff3 Four (4) Stage Dry Nitrous System
Injector Opening Time table
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BigStuff3 Four (4) Stage Dry Nitrous System
NOS Staged Spark Control Graph
The Y axis of the Spark Control Graph represents ignition timing as a function of RPM. When
the mouse button is released, the software will provide the following information for that point in
the graph:
 Ignition timing
 Engine RPM
The new spark value will be updated in the graph once the mouse button is released. BigStuff3
recommends saving your changes as you go along. Go to the GEN3 system User’s Manual for
information on how to save changes.
Note: The spark values for each stage are absolute spark values and not spark retard
values. In other words, the spark value at any point in the spark graph is the total spark
the engine will see at that RPM!
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BigStuff3 Four (4) Stage Dry Nitrous System
If the “Engine Saver” RPM limit is reached, the GEN3 ECU will shut off the Nitrous control!
The rev limiter can be set from the Operating Configuration table in the BigComm software, as
shown below.
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