I have followed all the steps to disable STFT/LTFT, DFCO, and VE so that I could tune the MAF.
I went out and logged my wideband vs. MAF frequency and then applied that to the table (Multiply by half %) but I noticed it didn't change my idle AFR at all, even though it subtracted a substantial amount. So I thought I would just play with the idle section only to see what was going on. Normally at idle, it would be around 8g/s (~3300 Hz). I tried lowering it more and more but the AFRs didn't change. I took it to 2g/s and it still idled fine and still was rich (12-12.5). Just to make sure I wasn't missing something, I zeroed it all out and the car would die immediately upon starting.
Couple questions:
- Why is the AFR not changing whether I have 2g/s or 8g/s set for that particular MAF frequency? Is there a minimum fueling setpoint?
- When MAF tuning, should I be targetting 14.7 across the entire range, and then add back VE to compensate for the "load" regions? (I plan to do VE after MAF is done, and then enable both for the blend)
Here's the current tune:
2001 Corvette_with_Procharger_MAF_tuning.hpt