94 corvette breaking up under heavy load
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,467
Likes: 43
From: Auburn MA
94 corvette breaking up under heavy load
The car appears to idle fine and it's a little rough cruising around under light but that is somewhat normal with the tune that is in this car. When I go full throttle it starts falling on its face and breaking up after 3-3500 rpms under a couple pounds of boost. Let me go over the build, 383 Golen Boosted build fully forged 9.5:1 CR, AFR 210 heads, and it is being forced fed by a Precision 7675 journal bearing rear mounted turbo. The ECU has been swapped to a 411 pcm Torqhead setup, so the car does not have an optispark on it at all and it has 8 brand new LS style coilpacks on it. I am baffled why it is breaking up maybe it fouled it's plugs, I have not had a chance to pull them and look. Just looking for ideas on what could or my cause this driveability issue.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,467
Likes: 43
From: Auburn MA
Unfortunately i do not have a way to log, Do you have know of a way I can log? Do I need to get HP tuner in order to do this? I know the MAP sensor is in good working order as the car will not run without it as it was converted to speed density with a 3 bar MAP. The map sensor is brand new, all the ignition coils are new, new 8mm Taylor wires, new cam position sensor, new crank position sensor, new NGK 3346 plugs gaped to .025"... however the car could have fouled the plugs because I was having a extension harness issue on the driver side coil pack. The extension harness was intermittently dropping power to this bank, this was giving me a P0351 code but now it's not throwing this code anymore, after I replaced this extension harness. I guess maybe I should start by ripping the plugs out of the driver side and see what's doing.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,467
Likes: 43
From: Auburn MA
I forgot to add the fuel pump is a walbro 535 hellcat pump that is rewired and it is feeding racetronix 76lbs injectors.... I was wondering if bad gas could be an issue seeing as I last got gas back in may... but I'm never that lucky that bad gas is an issue, it runs on pump gas 93, no E
Last edited by Impala Balko; Sep 2, 2024 at 03:39 AM.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,467
Likes: 43
From: Auburn MA
I used the NGK 3346 plugs because thats what the engine builder suggested due to the heat range of it and i assumed it fit the head as well, is the NGK 4644 plug the same heat range as the 3346? What would happen using tapered seat plug on this head, would i lose compression?
