DYNATEK DFCH-3 User manual

Dynatek • 164 S. Valencia St. Glendora CA 91741 www.dynaonline.com 800.928.3962
User Manual
Parts List
FI Controller
Installation Guide
Wire tap
Wire ties
Velcro®Strip
Alcohol Swab
2002-2005 Harley-Davidson
Twin Cam Touring Models
Part Number DFCH-3
2801188 REV. 5-18-05
Congratulations on your purchase of this Dynatek product.
Please take a moment to read these instructions completely before
installing the FI controller. The installation will only take a few minutes,
but proper setup for your specific bike will take longer

Remove the seat. Remove or raise the fuel
tank. The tank needs to be raised enough to
give access to the fuel injectors and TPS
wires.
Unplug the front injector. On the FI Controller,
there are 2 pairs of injector connectors. Plug
the pair with the orange wires into the front
cylinder injector harness and front cylinder
injector. Repeat this using the other
connector pair and the rear cylinder injector.
Locate the TPS connector behind the throttle
body.
STEP 1
STEP 3
STEP 2
Installation
Rear Cylinder Injector Front Cylinder Injector
TPS Connector
STEP 3 STEP 2
STEP 1
Part# DFCH-3 2

Unplug the connector from the TPS. Crimp
the wire tap onto the wire that is grey with a
purple stripe. This wire should be in position
"C" on the connector. Plug the grey wire from
the FI Controller into the wire tap.
Run the wiring harness for the FI Controller
from the engine to the seat. Make sure that it
will not get damaged when you reinstall the
tank. Use one of the wire ties to tie the wires
to the frame, away from the cylinder head.
Place the FI Controller where you plan on
mounting it permanently. In most cases, this
will be next to the ECU, on the right hand
side of the bike. Connect the ground lug
(black wire) to a grounding point on the bike.
Use the Velcro tape to mount the FI
Controller in position. Use alcohol swab to
clean mounting surface prior to attaching
Velcro.
Reinstall fuel tank and seat.
STEP 4STEP 6 STEP 5
STEP 4
STEP 6
STEP 5
Part# DFCH-3 3
Installation

For Tech Support: 800.928.3962
Controls
The FI Controller is preprogrammed with 4 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 4 fuel
curves correspond to varying levels of performance
modifications. The levels of modification are broken
down into the following groups.
Base Curve 1 - Stock or basic modifications. This
includes slip on exhausts, intakes, air boxes, and air
filters.
Base Curve 2 - Bolt on modifications. This includes
full exhaust systems.
Base Curve 3 - Motor modifications. This includes
cams, big bore kits.
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 4 curves, there are 3 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 3 different RPM ranges. The RPM
ranges are:
LOW Idle - 2000 RPM
MID 2000 - 4000 RPM
HIGH 4000 - 6000 RPM
To add fuel, turn the potentiometer clockwise. To
subtract fuel, turn the potentiometer counterclockwise.
With the potentiometer pointed straight up at the thick
tick mark (towards the Dynatek logo), that is 0%
adjustment. Fully counterclockwise is -20%, and fully
clockwise 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.
Calibration
To select the right curve, start by making sure that all
3 of the RPM pots are set to zero adjustment. Then
select the base curve which corresponds to the bikes
level of modification. This should make the bike run
better at all RPMs. The AF ratio if measured on a
dyno should be much smoother throughout the RPM
range than without the FI Controller. If it feels worse
or the AF ratio gets too lean at any RPM compared to
stock, try a different curve.
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 subtract 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
Controller. Make sure that you have the ground
hooked up 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.