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Hi!
I came from the TDI world, even did my own tuning.
Since the vag com gave a very good diagnostic of MAF per revolution, I had to use these pids to get that.
0-0 BMW 335d Air Massrev,Air MassR ,110,(([10]*18000)/[0c]),0,1400,g/r,Auto
0-0 BMW 335d AirPerBar,Air/bar,,(VAL{0-0 BMW 335d Air Massrev})/(VAL{0-0 BMW 335d Intake Boost}+1),300,500,mg/r/b,Auto
One is maf mg per stroke.
The other is maf mg per stroke, per bar (to see sort of an efficiency of airflow- if you take egr out of the system). I used to take logs on vag com and do MAF divided by absolute pressure. It was also useful to see at what higher rpm and boost the turbo and/or exhaust backpressure were choking flow.
The mg/stroke should be around 450-500 ideally without egr at idle no boost.
For the boost version, you use this to diagnose a boost leak or clogged intake.
Disable the egr for best results:
If you run hard boost and get a number higher than 500, you are leaking air boost side.
If you run higher rpm and/or boost and get numbers very low, like less than 300, and dropping, you have a restriction on the intake (valves? throttle? turbo exhaust back pressure?)
I was thinking to add another formula to get fueling of mg per stroke too, which I will look into, but I haven't done it yet.
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