Originally Posted by
hjtrbo
My method is based on the russK method for gen 3's.
With your fuelling pretty good...
Using the VCM scanner set the idle rpm at 650, 800, 1000 & 1200 for 30 seconds each time on a fully warmed up engine.
Using the averaged dynamic air flows recorded in the scanner for each rpm band; put those into your min air table with the exception of the 1200 rpm cell. In that cell, put in less than the recorded dynamic air (but still more that the 1000 rpm cell). This helps with blips returning smoothly to idle speed.
To set the ECT multiplier change your tune so every idle rpm table is 1000rpm. The colder the weather the better. Do an idle run from engine cold to hot. Log your dynamic air vs minimum air and average them over 10 second rolling blocks I.e pidNumber.avg(10000). The 2 curves in the scanner should be very close to overlapping and follow each other on the way. When they do, you know you have the multiplier dialled in sweet.
Depending on your OS, if the multiplier in the around 90degC cell is 0.25 then the formula for minimum air flow is Min Air Flow vs RPM table x (ECT Multiplier / 0.25)