TFI W/ 02 sensor

[flhtcrp]

Is there a TFI I can use that don"t elimiate the 02 sensors? 2009 FLHTC

 

[Hoople]

The o2 sensors is what makes the A/F ratio run lean. (14.3-14.7) You have to bypass them in order to run outside of that window.

 

[flhtcrp]

Yes but don't a TFI change fuel pulse to richen it up?

 

[Hoople]

Yes but don't a TFI change fuel pulse to richen it up?

Yes Exactly.

But if you left the o2 sensors working, they would see that extra richness and would tell the ECM to lean out. There would be a big tug of war going on.

You really need to disable them which will force the ecm to go by "look up tables" only,, and then "stack" some extra pulse width on top of the look up table value using the TFI.

 

[Hoople]

Did not see this was official Support area. Please delete my replies.

 

[DobeckTechSupport]

Great answers Hopple and you are absolutely correct.

If you did not want to bypass the O2 sensors then you would just have to turn the GREEN pot to 1:00 which is OFF. What you would lose though is the down low horsepower and torque most people are trying to gain. Without turning the GREEN pot off you would end up in the "tug of war" which Hopple mentioned. This causes horrible drivability and could lead to throwing engine lights.

 

[flhtcrp]

The cobra system has one for o2 sensors does it work different? Thanks for replys just learning

 

[Hoople]

The cobra system has one for o2 sensors does it work different? Thanks for replys just learning

Just wondering,,why do you want to utilize the o2 sensors?

 

[flhtcrp]

Want to keep the o2 sensors to help out with fuel mileage