any help appreciated
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,987
Likes: 6
From: Arkansas
St. Jude Donor '11-'12-'13-'14-'15,'19
any help appreciated
99 C5
243 heads with some work done on them. A&A V2 supercharger ported LS6 intake and throttle body long tube Kooks and x pipe M12 6 speed 4:10 three rib car was running great until I had a problem auto crossing with steering wheel column lock which was bypassed 7 years ago. I put in one of CLC5 bypass and did the brown wire mod. Problem went away. I went to the next autocross and car was running OK but not great We found the large hose came off supercharger . Now the car wont go at full throttle when it hits 4500 RPMs. Replaced boost a pump but it is the same. P/S it has 65lbs of fuel pressure but do not know what it has under power.
any ideas
243 heads with some work done on them. A&A V2 supercharger ported LS6 intake and throttle body long tube Kooks and x pipe M12 6 speed 4:10 three rib car was running great until I had a problem auto crossing with steering wheel column lock which was bypassed 7 years ago. I put in one of CLC5 bypass and did the brown wire mod. Problem went away. I went to the next autocross and car was running OK but not great We found the large hose came off supercharger . Now the car wont go at full throttle when it hits 4500 RPMs. Replaced boost a pump but it is the same. P/S it has 65lbs of fuel pressure but do not know what it has under power.
any ideas
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
with a car that heavily modded it could be lots of things... I would start by pulling all the codes... do you have hptuners or any other means of datalogging the car?... do you have a wideband in the car?... with that you should at least be able to tell if it's leaning out... will the car go past 4500 rpm free revving or under moderate (not wide open) throttle?... are you still on a maf tune or is it speed density?... if speed density it will not throw any misfire codes so if it is misfiring you will have to diagnose it manually
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,987
Likes: 6
From: Arkansas
St. Jude Donor '11-'12-'13-'14-'15,'19
Thanks for the input The only thing I have is a Tech 2 and it does not show any codes or misfire data.
if I ease the pedal down it will rev to 6000 rpms. If I run it up to say 3000 rpms and then slam it to the floor when it hits 4500 it will bog down until I let the pedal up. It will rev normally without any load
if I ease the pedal down it will rev to 6000 rpms. If I run it up to say 3000 rpms and then slam it to the floor when it hits 4500 it will bog down until I let the pedal up. It will rev normally without any load
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
no wideband or fuel pressure gauge?... do you happen to be running a secondary fuel system or meth?... have you tested the wiring to the boost a pump to make sure it is getting power?... it does sound to be fuel related if it drives fine otherwise, you're just gonna have to start testing things and narrowing it down... I would definitely try to find someone that can datalog it for you to see what's going on
