Trims and WB dont match
05-23-2007, 11:04 AM
#1
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Trims and WB dont match My LTFT's are anywhere from -4 to -12, my STFT is from -2 to -8, and my WB02 is from 0 to -4 or -5. My afr err is almost dead on with the maf since I dialed it in. Anyone know what the deal is with this? Does anyone have their trims matching their wb, if not what should I tune by?
05-23-2007, 11:26 AM
#2
I always go by the wideband, fuel trims are driven by the average of the O2 switch point voltage (typically around 450mV) and not actual AFR. After I tune the fueling to match the commanded, then I adjust the switch point voltage (in regard to the airflow mode) to achieve my desired cruising AFR (within the narrowband's limits). 
05-29-2007, 04:28 PM
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Originally Posted by 12secSS
I always go by the wideband, fuel trims are driven by the average of the O2 switch point voltage (typically around 450mV) and not actual AFR. After I tune the fueling to match the commanded, then I adjust the switch point voltage (in regard to the airflow mode) to achieve my desired cruising AFR (within the narrowband's limits).
Im thinking about disabling my LTFT and just using the STFT and WB02.