I've been trying to tune my MAF (open loop) for a while and I can't figure this situation out:
Car: 98 GTP with CAI, 1.8 Rockers, 3.4" pulley, TOG headers.
Equipment: NGK AFX with Bosch sensor
As I recalibrate my MAF, it appears that I have more airflow than stock up until 8875Hz, but from then on it flows less and less as the frequency rises. See attached tune and log.
I've rechecked this many times and my wideband reads consistently. Every other comparable car flows more than stock with an exponential curve which goes up to 4lb/min over stock at the highest frequency. On mine it reverses and goes negative!
I've cleaned the MAF and get the same response. Any ideas?