MSD FI Enhancer
for 2002-2005 Honda VTX1800
PN 4178
Parts Included:
1 - MSD FI Enhancer
1 - Wire Tap
1 - Wire Ties
WARNING:
1 - Velcro®
1 - Alcohol Swab
During installation, disconnect the battery cables. When disconnecting,
always remove the Negative cable first and install it last.
operation
The MSD FI Enhancer is preprogrammed with four base fuel curves. The curves are selected using the
switch labeled BASE. These curves adjust fuel delivery based on throttle position and rpm, providing
the right amount of fuel under all conditions. The four fuel curves correspond to varying levels of
performance modifications. These levels of modification are broken down into the following groups:
Curve 1 - Stock or base modifications. This includes slip on exhausts, intakes, air boxes, and air filters.
Curve 2 - Bolt on modifications such as a full exhaust system.
Curve 3 - Engine modifications, including cams, big bore kits, etc.
Curve 4 - The fourth curve has all of the fuel adjustment values zeroed out. This curve is selected by
moving the rotary switch to any position other than Base 1, Base 2 or Base 3. This curve is
useful for those wanting to just modify the fuel delivery with the potentiometer adjustment,
without having any other adjustments.
In addition to the four curves, there are three potentiometers that allow you to fine tune the curve you
select. These potentiometers allow you to adjust the fuel curve from +20% to -20% in three different
rpm ranges. The rpm ranges are:
Low - Idle - 2,000 rpm
Mid - 2,000 - 4,000 rpm
High - 4,000 - 6,000 rpm
To add fuel, turn the potentiometer clockwise. To subtract fuel, turn the potentiometer counterclockwise.
With the potentiometer pointed straight up at the thick indicator mark (towards the MSD logo), that
is 0% adjustment. Fully CCW is -20%, and fully CW is +20%. Adjusting the potentiometer between
these points will result in adding or subtracting an amount of fuel proportional to how far the knob
was moved from zero.
LED
The FI Enhancer has an LED that will illuminate when there is power to the unit.
MSD POWERSPORTS
• 1490 Henry Brennan DR., El Paso, Texas 79936 • (915) 858-3365 • FAX (915) 858-3496
INSTALLATION INSTRUCTIONS
installation
1. Remove the seat and airbox assembly.
Move the ECU out of the way. Remove
the battery cover.
GROUND
CONNECTOR
Connect the FI Enhancer ground to
the battery ground(Figure 1).
2. Reinstall the battery cover, and reinstall
the ECU. Using the supplied velcro,
mount the FI Enhancer (Figure 2).
3. Route the wiring harness from the FI
Enhancer under the tank and through
the frame (Figure 3).
Figure 1 Connecting Ground.
Figure 2 Mounting the Enhancer.
Figure 3 Routing the Wires.
MSD POWERSPORTS
• 1490 Henry Brennan DR., El Paso, Texas 79936 • (915) 858-3365 • FAX (915) 858-3496
INSTALLATION INSTRUCTIONS
4. Unplug the harness from the stock injectors. Make sure to keep track of which connector is
for the front injector (Figure 4).
5. On the FI Enhancer harness, find the connector pair that has the Orange wires. Plug one side
of it into the stock harness for the front injector. Plug the other side of this harness into the stock
injector. Repeat this step for the rear cylinder and the other FI Enhancer injector harness (Figure
5).
6. The Throttle Position Sensor (TPS) is located on the front side of the throttle bodies, behind the
airbox. Unplug this connector (Figure 6).
7. On the TPS harness, locate the Red wire that has a Yellow stripe. Using the supplied wire tap,
tap into that wire. Make sure that the tap is on the wire securely. Connect the Gray wire from the
FI Enhancer harness to this connector (Figure 7).
8. Reinstall the seat and airbox assembly.
Figure 4 Injector Connections.
Figure 5 Enhancer Injector Connections.
TPS CONNECTOR
TPS
Figure 6 TPS Connections.
MSD POWERSPORTS
Figure 7 TPS Location.
• 1490 Henry Brennan DR., El Paso, Texas 79936 • (915) 858-3365 • FAX (915) 858-3496
INSTALLATION INSTRUCTIONS
CALIBRATION
To select the right curve, start by making sure that all three of the rpm pots are set to zero adjustment.
Then select the base curve which corresponds to your bike’s level of modification. This should make
the bike run better through all rpm.
Once you have selected the correct curve, then you can fine tune any problems with the map by using
the potentiometers. With the arrows on the pot straight up and down, the pots are at 0% adjustment.
To add more fuel, turn the pots clockwise. To subract fuel, turn the pots counterclockwise. Do not
attempt to adjust while riding!
TROUBLESHOOTING
If the STATUS LED does not come on when the ignition is switched On, there is no power to the
FI Enhancer. Make sure that you have the ground connected properly either directly to the battery
ground, or to a lug on the frame that is grounded.
If the LED comes on, but does not run on one or both cylinders, double check all connections at the
injector, making sure the connectors are seated properly.
Service
In case of malfunction, this component will be replaced free of charge according to the terms of the warranty.
When returning components for warranty, Proof of Purchase must be supplied for warranty verification. After the
warranty period has expired, replacement service is charged based on a minimum and maximum charge.
All returns must have a Return Material Authorization (RMA) number issued to them before being
returned. To obtain an RMA number please contact MSD Customer Service at (888) 258-3835 or fax
a request to (915) 858-3496. Send the unit prepaid with proof of purchase to the attention of: MSD
Powersports, Customer Service - RMA #, 12120 Esther Lama, Dock 5, El Paso, Texas 79936.
When returning the unit, leave all wires at the length in which you have them installed. Be sure to include
a detailed account of any problems experienced, and what components and accessories are installed
on the vehicle.
A replacement unit will be returned as soon as possible after receipt, COD/Cashiers Check for any charges.
For more information, call the MSD Powersports Customer Service Line (888) 258-3835. MSD Powersports
technicians are available from 8:00 a.m. to 5:00 p.m. Monday - Friday (Mountain Time).
Limited Warranty
MSD Powersports warrants this product to be free from defects in material and workmanship under its
intended normal use* and if properly installed, for a period of one year from the date of original purchase. If
found to be defective as mentioned above, it will be repaired or replaced at the option of MSD Powersports.
Any item that is covered under this warranty will be returned free of charge through standard shipping
methods. If faster service is required the customer has the option of paying for this service.
This shall constitute the sole remedy of the purchaser and the sole liability of MSD Powersports. To the
extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representations
whether expressed or implied, including any implied warranty of merchantability or fitness. In no event
shall MSD Powersports or its suppliers be liable for special or consequential damages.
*Intended normal use means that this item is being used as was originally intended and for the original
application as sold by MSD Powersports. Any modifications to this item or if it is used on an application other
than what MSD Powersports markets the product, the warranty will be void. It is the sole responsibility of
the customer to determine that this item will work for the application they are intending. MSD Powersports
will accept no liability for custom applications.
MSD POWERSPORTS • 1490 Henry Brennan DR., El Paso, Texas 79936 • (915) 858-3365 • FAX (915) 858-3496
Autotronic
MSD POWERSPORTS • 1490 Henry© 2006
Brennan
DR., Controls
El Paso,Corporation
Texas 79936 • (915) 858-3365 • FAX (915) 858-3496
FRM27764
Created 05/06
Printed in U.S.A.
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