I have seen a few threads about LTFT. But my question is can it help determine AFR if you are lean or rich and what is the acceptable LTFT on an evo x I have been anywhere from 0 to 3.9% is my ecu still learning or does it change that much from day to day?

 

anything within -+ 5% is good. and for STFT you should target 0% - if its just going from 0 to 3.9% and back and forth its nothing to worry about. as long as both LTFT trims are where they should be your injector scaling and latency should be good to go.

 

Thanks for the reply I meant to be in the x management/ forum area if a moderator could move my post that would be great. I did see the +- 5% is ok so you confirmed my research. It seems that LTFT should be less variable but who am I to say how a tune should be im a novice. ive seen + 3.9 to 0 in one non wot trip seems like the ecu is always learning as apposed to learning and running with it.

 

had a good discussion with tscompusa about LTFT thanks for the help! Its always good to see people willing to partake in a short IM discussion.

 

no problem. glad you appreciated it. feel free to msg me on AOL if you have anymore questions.