Hello all.
I have used the search function but still seek clarity on an issue Im having tuning a 2005 Grand Prix supercharged series 3 with a 3.6 pulley, headers, intake.
I did a MAF calibration based on a MAF HZ vs LTFT and pasted special multiply by %. FUel trims went from -15% to -5% after the calibration, so sucess there, only thing is we get KR at part throttle and when going WOT, but let up when we see KR. Why do I get KR now, but not before?
Im confused why with a smaller pulley, the MAF calibration wanted a lesser number indicating less air, so leaner. Wouldnt a smaller pulley yield more air flow and want richer?
Also, when the KR happens the NB02 reads 850-920mv.
Thanks for any Insight.