Originally Posted by
cmitchell17
Bad thing with me about airflow and torque models is I tend to go all or nothing, meaning I want it 1000% perfect or I just want to give up haha, so I will end up wasting a lot of time for not much output.
Anyway, I got the MAF bung braised in, pretty crappy job, but its in. So I had a breakout harness, and for some reason I just decided to leave my broken out IAT plugged in, but I plugged in my MAF and checked the wire outputs from a LS9 to ensure everything was in the right position (MAF signal, ground, 12V power). So it seems to be working initially, but then the state changed from No Fail to MAF Failed. So I turned it off and started it back up a few time and kept trying to clear codes (since I had that permanent MAF code (which seemed like it was a circuit high but now its saying performance)) then it didn't find any DTC's anymore, the frequency outputs a signal and it defiantly responds to throttle so it seems to be working.
However, it is not calibrated of course. Once it went from the MAF Failed state to the No Fail, it immediately went super rich like .6 lambda, and the trims pegged to -25% and it was trying to die. So I pasted in a stock LS9 MAF calibration, but I am running a 3 in charge pipe tube, so I would imagine it will need quite a bit of calibration from the stock LS9 values. I am running a Hitachi LS3/LS9/LS7 MAF which was surprisingly cheap, only about $23 or so I think.
One thing I didn't think of was the straight (laminar?) flow, I put it in a straight part of the charge pipe but its only about 3 or 4 inches from a 45 degree bend, I guess it won't effect it too much.
And as for the torque model, couldn't I put in LS9 values? at least to start with? Or does everyone just extrapolate the rest of the curve at the higher airmass/airflows?