I have the mods in the sig.....plus a set of ported heads.......the heads flowed 270@525 and I am having problems with the car running lean at the end of my gears.....I had it dynoed with AF and it was almost 15 at the end the gear and it would start to miss around the same time it started getting lean.......so I thought well it was bad tuning.....sent the computer back to PCMFORLESS and it was suppose to fix it.....I haven't had it dynoed yet but the miss is still there.....Maybe my fuel pump is not able to pump enough gas......Would buying a 255 lph fuel pump fix this with stock injectors or do I have to go ahead and buy in #30 injectors for this......maybe a AFPR would help a little.....thanks for all help...

Michael

 

Get a fuel pressure gauge on it and watch the gauge when you get to the top of your gears. If your pressure drops, your pump is struggling. If not, then you need bigger injectors or more fuel pressure. (as long as the tuning is right)


-Dave C. '97 Z28

 

Yeah see what the FP is, your stock injectors are probably getting close to their limit too.