1 way to calculate GMVE.
Here is how I did it a while back. Without MAT I found the bias of 0.35 worked for me. The bias also changes depending on how your driving. E.g, for power pulls, your bias could start out at 0.35 but by the end of the pull be down at 0.31. Spent way to many hours on this. Trust me here, best is with MAT.
You need 2 formulas. One for closed loop, and another for open loop where your commanded AFR is used.
This formula sitting inside smokeshows formula ends up been pretty nasty to look at. Especially worse if you make an error, then trying to work out where you mucked up
Without MAT
GMVE = IFR * IPW * AFR * (IAT + (ECT - IAT) * BIAS) / MAP
With MAT
GMVE = IFR * IPW * AFR * MAT / MAP
IFR g/sec Injector flow rate
IPW msec Injector pulse width
MAT degK Manifold air temperature
IAT degK Intake air temperature
ECT degK Engine coolant temperature
MAP kPa Manifold air pressure
BIAS Constant, 0.2875 -> 0.35
Required channels:
Manifold Air Temp
Engine Coolant Temp (if no manifold air temp available)
Intake Air Temp (if no manifold air temp available)
Intake Manifold Absolute Pressure
Injector Pulse Width Avg.
Injector Flow Rate
Credit to:
http://redhardsupra.blogspot.com/200...odels.html?m=1