Is the Long Term Fuel Trim(LTFT) used during WOT? I'm fairly sure that the Short Term Fuel Trim(STFT) is thrown out the window during WOT.

 

Bump... Come on... Someone has got to know.

 

I think you correct. The ecu is not trimming fuel at WOT i believe.. it relies off other sensors such as O2 voltage and stuff... someone step in if im off

 

At WOT, The ecu is using only the factory maps to dump in fuel, based on throttle position, intake and coolant temps, and calculated load. The o2 is not used in WOT operation, and that 'mode' is called open loop. In closed loop operation the o2 sensor is used to adjust fuel mixture by using LTFT and STFT.