MAFT+AFC2 Tuning

[whitegst97]

Im running an upgraded turbo at 20 psi, 255 FP and 650cc injectors. I have my Base settings set for 650 injectors but my fuel trims are extremly lean, SHTM 15 LGTM 0, so i need to add a lot of gas but even without adding gas the car shows signs of being pig rich(backfires between shifts, smell gas, black smoke) when the trims are showing very lean conditions. I added gas with the AFC to the low settings to try and get the trims at 0 but it just gets it even more rich... Then at WOT i have to take away about 30% with the WOT knob because the cars bogs, sputters, backfires... this goes away when deducting gas. So what to do, car runs really rich but trims shows very lean. If i adjust the base to get the trims to 0 then the WOT sputters, backfires... pulls timing..

 

[slowpokin699]

Your stock o2 sensor is probably bad. And getting a wideband might not be a bad idea.

 

[OverboostXS]

I didn't see an adjustable FPR in your profile or in your pics, thats hand in hand with a 255lph fuel pump like you say you have. ( possible solution to your symptoms ).

 

[whitegst97]

The 02 sensor reads fine, it cycles and well it is 2 months old so i don't think it went bad already.
I see im going to need an AFPR, i guess but why the weird readings, logger showing lean and car sounds rich..