Originally posted by Russell:
even with a custom chip from streetflight?


You are still stuck using the flow calibration of the meter.

(generalized example)
If the MAF calibration has 200kg/hr as .1 volts and you idle at 75kg/hr you will never be able to tune idle worth a damn.

This is what I mean by not leaving any room for the MAF to read properly at such low flow rates.


Yes a chip can help compensate ($$$ of dyno time!) but even if you trick the PCM into making that 200 look like 75 for a stable idle when you leave idle and are flowing under the MAF's minimum you will always run lean!


Your best bet is to get a MAF calibrated for your kg/hr range of operations. An SVT MAF is a good place to start (it has a higher maximum kg/hr flow calibration and can support ~300FWHP)
Also a Pro-M (straight calibration) would be a great choice due to it's less restriction. (No center post) Then you can take the supplied transfer function and have it used as a base for your program.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.