Help guys i trying to figure out why my car is running lean after about 5 mins of running. This is what I got on my 92 Civic HB:
greddy turbo
VAFC
AVCR
RC 450cc
AEM fuel rail
AEM pressure reg.
MSD 6al
p28 ecu
and all your other basic parts.

however, this is what happens. I would start the car, my AF meter would show rich. After boost @ 5psi for about 5 mins or so. The meter would stay around the red zone. Timing is good. however car idle a little rough. thanks for the replys

 

idle is rough most likely due to the large injectors.....310s or 370s would probably suit you much better.

also since you are running since large injectors its possible that you are putting so much fuel through that you fouled out your 02 sensor and now its reading lean.

just a few thoughts

 

i will second that! BAD 02's! or maybe you need to richen your settings on the afc.