I have a problem does antone know how to tune this fuel controller? I so I need help. My car is fuel cutting around 4000 rpms I just installed my sti 550cc injectors and a walbro fuel pump. I also hace a 3 inch turbo back unit with a greddy fmic, aec short ram intake with a 2.25 up-pipe connected to a t3/t4 turbo hybrid. Please I need help.

You need to get to a tuner shop that has an AWD dyno and wideband O2 sensor.

Hi, anybody ever installed the S-afc with a HKS fcd, they are both supposed to get their signal from the same air flow sensor wire, how does that work?

The SAFC intersects the MAF sensor signal. The FCD intercepts the MAP sensor signal. :) Not the same. ;)