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DFO/TFI Information


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Here's the latest update on the default setting on the TFI/DFO fuel management units.

I spoke to to George at Techlusion I found out about the default setting of the TFI pot #4, to change it to 7 from the recommended setting of 4 on most models . The setting of this pot to 7 changes the characteristics of the unit to default to other settings that may benefit the fuel mileage but not necessarily the performance .

If you set the #4 pot (high speed) to 7 on the dial, it then makes the crossover from low to the high speed circuit at 4500 RPM instead of the usual 4000 RPM when set at 4 on that pot. It also removes the extra fuel that is added by the green (low speed pot) until approximately 2000 RPM's.

This may be beneficial to some that are running stage 2 upgrades in the ECM in that it would eliminate an overly rich condition on a cold start up and also reduce the fuel added in a low RPM range below 2000 RPM's. It may not however serve any useful purpose on stock ECM's with the factory downloads.

It may not be beneficial to all applications, but well worth a try.

Techlusion Tech Support..877-764-3337

Here's the setup info for the TFI/DFO

Tuning 1995-2007 Harley kits(except Gen3 kits)

Green LED pot(1st): Air fuel mixture screw adjustment. With TFI installed and the bike fully warmed up, screwdriver in hand, locate the green LED and the pot right below it. Using the throttle raise the RPM to a high idle or about 2000-RPM. Once there, slowly turn the green pot clockwise from the 1:00 position (off)

until you achieve the highest RPM and smoothest running sound (like a mixture screw on a carburetor). You should find the best setting between 2:30 and 4:00 o’clock. If you turn the green pot clockwise and the engine does not accept any more fuel (RPMs drop when adding fuel) you may have one or more of these problems .

Yellow LED pot(2nd): Acceleration fuel adjustment. Anytime the LED is on, this pot is adding fuel. In neutral raise the RPM slowly up through the mid range and see no yellow LED. However, opening the throttle quickly from idle you “should” see the yellow LED come on. Add one clock position at a time until the bike says too much (hesitation) then back off 2 clock positions, if adding makes it worse go opposite direction. The yellow pot adds most of its fuel below 75% of maximum RPM. If no yellow LED there is not enough load to turn it on. At that point the street or dyno will be able to show the difference.

Red LED pot(3rd): Main jet fuel adjustment. It adds about 5 points of main jet fuel with every clock position. For example, one clock position is the same as 150 to 155 main jets. Fine tuning: Start with the suggested setting and then add one clock position at a time until the bike says too much (hesitation) then back off 1 clock position, if adding makes it worse go opposite direction. The red pot adds most of its fuel above 70% of maximum RPM.

RPM pot(4th):
1 - Sets RPM that the red LED pot (main jet fuel) turns on. All Harley. One clock position is roughly 1000 RPM. This pot should be set to about 70% of redline. (For example: Harley Softail redlines at 5600 rpm and 4000 is roughly 70% of redline which would be 4:00 o’clock). Verify setting by raising the RPM in neutral, look for green and yellow LEDs to shut off and the red to turn on at the chosen RPM or refer to suggested settings if you have no tachometer.

2 - Shuts off idle fuel. In some cases modified engines
can produce a richer than normal idle mixture. 1:00 o’clock through 6:00 o’clock sets RPM that the red LED pot (main jet fuel) turns on. When the 4th pot is turned
to 7:00 o’clock the software is instructed not to add fuel until 1250 RPM. Also, when setting the 4th pot at 7:00 o’clock the software automatically defaults to 4000 RPM (internally) to switch to the red LED pot (main jet fuel).

Installation pics here...Click on "installation pictures" on the left.

EFI - Electronic Fuel Injection Controllers - Motorcycle, ATV, Snowmobile, UTV
my yellow light used to come on when I wack the throttle but now it doesn't.Also the red light is always on and I don't know if that is normal.I also can't seem to get any noticable rpm change with the first pot.Does my dfo need to be replaced.My bike is a 04 standard with bassanni prostreets and ness big sucker.
If your light doesn't come on now and it did before, try backing it down a bit and try hitting the throttle again. If it still doesn't come on, call George at techlusion. The red shouldn't be on unless it is supplying fuel from that pot.He'll probably tell you to send it back. 877-764-3337