alright guys I just can't figure what to do anymore !!

I installed the gm supercharger on my 1997 z24 cavalier....

here's my setup !

Walbro 255 fuel pump
370cc RC injectors
gm supercharger ( that was on a 2001 sunfire )
modified cams to the 2.3 quad 4 HO spec
4-1 ceramic coated headers with a full 2¼ exhaust Magnaflow dual catback

Now I have been with some pro guys that has the hptuner, they tried to tune the car but my computer was quite @!#$ up.
Anyhow the guy went out with my car 6 to 7 hours to try and tune it and just couldn't fixe the dam thing.
We have been able to give a good idle but when we get into boost it revs fine.
on the road from time time to it was quite good but without any warning the engine start to rumble and goes too rich !
we tried with the stock injectors but no more succes.

Now would I need to rise my fuel pressure ?
or even use an 8-1 fmu ?

If anyone as any idea what I could try next, please !

Ben

I run 11psi boost and the stock regulator. Did you install a 2 bar map? what were you injector constants before you started and after?


HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED

the guy played a lot with the constant to get the engine running good, and yes we tried 1 bar and 2 bar map.
at fist my IAT sensor was no good so I changed it and just there it got all better to tune but still can run it good.