ok... update... I tried a Nismo FPR and installed a fuel pressure gauge... well the brand new nismo I bought is leaking vacume out the top
.... sooo I put the stock one back on because I was curious to see what kind of fuel pressure it was running that way... 36psi, which is normal, right?! AHHH!!! I installed a Apexi SAFC to turn the fuel down some... I leaned out my idle and the black fuel smoke went away, lol... My wideband is broken though, so I have no idea what kind of AFR I'm running. I took it out to do a rough street tune and ended up fouling my plugs again
. I hate this car, lol.
Are there any differences between the Kouki s14 injectors and the Zenki's? I have a Kouki engine running from a Zenki computer/wiring harness. I forgot about that fact until right now, haha.
ooo yea.. another edit... I just remembered that I am also using the s13 MAFS... could that make the difference?