Spoolin92GSX
10+ Year Contributor
- 491
- 2
- Oct 4, 2011
-
Inland Empire,
California
Okay, I've tried searching for several hours and can't find a thread with my problem, let alone one that answers my question.. I'm on stock ECU (no Link, no SAFC, no tuning at all), stock MAF, stock injectors, stock fuel pump (rewired), stock FPR, stock turbo.
Car runs fine in closed loop, but as soon as it hits open loop and I start to build boost it runs way leaner than the stock fuel maps, and leaner than is recommended on a proper tune. At WOT it will start out around 11.5:1 and as RPM's rise it will lean out more and more, as far as 12.2:1
I tried pulling my MBC and running WG pressure to see if I was pushing my fuel system too much, and exactly the same behavior/AFRs. I've done so many boost leak tests I can do them blindfolded, tested alternator voltage, messed with spark plugs/gaps, lowered boost, reset the ECU, checked/swapped MAFs, everything I can think of.
ECU is perfect repaired from ECMTuning, MAF is known perfect working condition, o2 sensor is MTX-L wideband running narrowband sim, TPS is verified 100% accurate, throttle body is freshly rebuilt..
Can anyone point me towards what the hell could be causing this!?
Car runs fine in closed loop, but as soon as it hits open loop and I start to build boost it runs way leaner than the stock fuel maps, and leaner than is recommended on a proper tune. At WOT it will start out around 11.5:1 and as RPM's rise it will lean out more and more, as far as 12.2:1
I tried pulling my MBC and running WG pressure to see if I was pushing my fuel system too much, and exactly the same behavior/AFRs. I've done so many boost leak tests I can do them blindfolded, tested alternator voltage, messed with spark plugs/gaps, lowered boost, reset the ECU, checked/swapped MAFs, everything I can think of.
ECU is perfect repaired from ECMTuning, MAF is known perfect working condition, o2 sensor is MTX-L wideband running narrowband sim, TPS is verified 100% accurate, throttle body is freshly rebuilt..
Can anyone point me towards what the hell could be causing this!?