Quote:
Originally Posted by oldman
correct me if I'm wrong, ST and LT trims are not affected by WOT, i.e. WOT is open loop?
2nd question, the big red negatives I see on ST / LT are too rich i.e. above the stoi levels x (temp,rpm)table. For instance if the (temp,RPM)table has a vale of 1.1 = 13.36 air / fuel, a large negative in the ST / LT trims would mean the car is running much richer than 13.36. Basically if I see negative numbers the fuel curve in the (temp,PRM)talbe should be adjusted down say to 1.05.
I have a new wideband, the suggestion is to run lambda out vs AF. It is all voltage. Can you shed some light on the advantages of mapping labda vs AF. I'm old and only think in AF.
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WOT does not affect trims. But positive trims at the time you go WOT can affect WOT fueling. If the trims are maxed out negative the ECM thinks the AFR is too rich and is pulling fuel based on the primary O2 readings. Make sure you O2 voltages in front are constantly oscillating up and down during part throttle. Send me a log if you aren't sure.
Correcting for closed loop fueling calibration is fairly time consuming. I would have to create an entire post on that.
Think lambda not AFR. Lambda is fuel independent. AFR is not. Lambda for stoich is 1.0 no matter whether you are running E0 or E85. A lambda less than 1 is rich. A lambda greater than 1 is lean.