the car ran/drove/idled 110% on a hacked to hell harness with 2 OEM and 2 aftermarket injectors with all the emissions stuff removed


Pulled it all out in favor of a PFC with 4 RC 1200's...simplified harness, GM 3 bar map, all the Banzai harness', modified trailing coil (setup was used on another S5 FC with no issues)

Now the car sounds like its running on 1 rotor..SUPER rich (injectors are set on the PFC, and even turned way down to try to get it to run), cleared some of the smoke when I brought the injectors down, but runs exactly the same

PERFECT compression on both rotors as I'd expect because the motors been recently rebuilt/streeported/new 3mm seals

Tried both the GM and OEM MAP sensors on different vacuum points..no change

Injectors are brand new and not sticking open, the compression tester was dry after I pulled it from each housing

I can get it to start and run, it just sounds like hell...like a piston type motor with a miss

New plug wires, has NGK/R's in it

what else can I look for?

 

well I hope you know you have to tune it first..


and 1200cc primaries why it idles and cruises like crap

 

Just to let you know that no two engines are alike. I would post in the pfc section. You need to learn how to tune for those 1200cc injectors or send it to get tunned.
Thanks Robert

 

1200 primaries is going to be difficult to idle lean (unless this car is on E85), it's hard enough with 850s or 1000's. set primary injectors to something like 46% with maybe -.60 lag. then you will have to retune everything. And if you have no idea what I'm talking about, take it to a professional.

Even better, put the stock primaries in. 550/1200 is plenty of fuel for at least 350rwhp.