Thomas0zero

99% Stock Redtop SR20DET in an S13.

I was running STUPID rich, 10 at idle and cruise, maybe lean out to 11.4 in full boost at redline. Replaced the bad maf pigtail, cleaned maf and fixed the terrible leak between the turbo and manifold. Now the car ran 13.7-15 afr's idle, cruising and in full boost. It has since leaned out and holding 15.7, in and out of boost. Car runs amazing and feels strong, but these lean AFR's are no good.

I dont think it is a clogged fuel filter because the AFR's good at redline before i changed anything.

Things to know.

Boost leak test/vacuum leak. System held 14psi without problems and without any real leaks.
ECU Code 55, all good.
Vacuum lines consist of, FPR, BOV, Gauge, Wastegate and vacuum booster.
Stock boost, Greddy BOV, AEM Wideband, stock injectors, FMIC.

Ive searched quite a bit with no definitive answer. I honestly cant figure out whats going on at this point. I really appreciate your help guys