ttls1
May 1st, 2014, 06:21 PM
Hi, I was just wondering if there is a multiplier somewhere that would affect the AFR relating to IAT. The reason I ask is yesterday afternoon I noticed my AFR at idle was indicating approx 13.2 on the wideband when the PCM was commanding 14.63. I ran a quick auto VE at idle and adjusted the VE to suit and measured AFR exactly matched my commanded AFR. This morning I was logging for RAFPN and noticed once the car was up to temp the measured AFR was back around 13.5. The only difference I can see is the IAT's this morning were 22 deg C and yesterday due to a hot engine bay and high mount turbos the IAT was 55 deg. Could this temp difference be causing the issue?
Cheers
Cheers