C5 LS3 swap barely runs?
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Teching In
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C5 LS3 swap barely runs? Hi all, I swapped an LS3 stock Corvette engine into my C5 track car and barely runs. Im using HPTuners and downloaded a stock LS3 tune for starters. Just some background on car, has no emissions, traction control, only rear 2 O2 sensors, Wide band O2 sensor installed, and 1 7/8' headers no cats, manual trans, Vararam intake.
It has the Gen3 ECM and wiring with all the necessary wiring adapters, with the Lingenfelter 58x conversion box.
Engine internals are all stock.
Now the MAF sensor is located about 15" from throttle body, which might be a little far but all i can do for now.
I have attached the scan when I ran it and if anybody can see any thing obviously wrong please let me know. THX Brian!
It has the Gen3 ECM and wiring with all the necessary wiring adapters, with the Lingenfelter 58x conversion box.
Engine internals are all stock.
Now the MAF sensor is located about 15" from throttle body, which might be a little far but all i can do for now.
I have attached the scan when I ran it and if anybody can see any thing obviously wrong please let me know. THX Brian!
Last edited by mrvedit; Aug 22, 2023 at 11:36 AM. Reason: Fix typo
Thread Starter
Teching In
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Im not sure if its a 411 or earlier, all I know its the 2002 C5 Z06 PCM. The entire wiring harness is Gen3 with Racetronix adapters. Oh and a LS2 throttle body. I wish I knew more but I guess thats why Im here, but thanks for the reply...
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@nicD must have a good eye examining your log file as I see no reason why a "stock" tune would have/need any kind of scaling. NicD - did you mean MAF scaling or are the MAP values that crazy?
How does a stock LS3 tune from a E38 PCM get loaded onto a P01 PCM? They don't even share the same strategies.
I might suggest that you have a custom tune that somebody said is stock, but really it's their custom tune for a stock engine, and it might very well not be a good tune either.
I might suggest that you have a custom tune that somebody said is stock, but really it's their custom tune for a stock engine, and it might very well not be a good tune either.
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MAP sensor scaling is off, look at what it's reading key on engine off. He is still using the LS1 map sensor settings when it should be set for the LS3 style.
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Verdad Gallardo Thread Starter
Teching In
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Ok here is my latest run. I attempted a throttle body relearn procedure but no help.
Yes it could be a wrong/bad tune from HP repository, but Im not proficient enough to tell. The tune did say 2008 LS3 OEM manual trans, but I guess thats a crapshoot...
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From: Ann Arbor, MI
TECH Senior Member
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From: Central Cal.
Is there a problem or just a mental block??
Borderline....