Converting LB9 to use LS wiring harness
08-18-2024, 05:05 PM
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Converting LB9 to use LS wiring harness
Has anyone ever tried to convert a TPI engine to use the LS wiring? Ive got a fairly fresh 350 that i custom built years ago but the ECM is my limit and i cant find anyone to burn PROM's for an 1985. I dont want to junk my engine nor buy a whole new engine so im looking for advice or direction
08-18-2024, 09:00 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: Converting LB9 to use LS wiring harness
Your TPI harness and an LS are too far different to try and make a Frankenstein product. You'll need to ditch the TPI harness and start researching LS wiring.
08-19-2024, 07:49 AM
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Car: 86 IROC
Engine: Twin turbo L31 HSR
Transmission: 700R4 w ProBuilt
Axle/Gears: 9 bolt 4.11
Re: Converting LB9 to use LS wiring harness
Or you could buy a Painless Performance TPI engine harness ( I think there's one for sale in the parts section) and convert your ECM to one from Dynamic EFI. Not that difficult and relatively cheap, probably $1000 all in with new stuff, less if you found those things used.
08-19-2024, 08:02 AM
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Re: Converting LB9 to use LS wiring harness
I assume you are more interested in the LS ECM capabilities vs the wiring? If that is the case I would research any of the aftermarket set-ups that are all widely used. FI Tech, Holley EFI, etc.
08-19-2024, 08:22 AM
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Car: 86 IROC
Engine: Twin turbo L31 HSR
Transmission: 700R4 w ProBuilt
Axle/Gears: 9 bolt 4.11
Re: Converting LB9 to use LS wiring harness
You can start here for some light reading on LS wiring stuff . https://www.eficonnection.com/. I'll just dust off the antique and totter on down the road...
08-19-2024, 02:51 PM
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Converting LB9 to use LS wiring harness
I feel badly saying this because Brian P said both comments...
I mean no offense.
I would avoid using anything from Painless Performance.
Their Harnesses are really poorly made (especially the Wire Crimping) and use poor Materials.
Go with something from Holley (Better quality, but not great. None of the big Brands are great unfortunately.)
If purchasing Connector Components, avoid EFI Connection. (They are way over priced.)
Instead purchase from Mouser.com and use the Thread below by QwkTrip:
Hyperlink
I mean no offense.
I would avoid using anything from Painless Performance.
Their Harnesses are really poorly made (especially the Wire Crimping) and use poor Materials.
Go with something from Holley (Better quality, but not great. None of the big Brands are great unfortunately.)
If purchasing Connector Components, avoid EFI Connection. (They are way over priced.)
Instead purchase from Mouser.com and use the Thread below by QwkTrip:
Hyperlink
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jmd (08-19-2024)
08-20-2024, 06:45 AM
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Car: 86 IROC
Engine: Twin turbo L31 HSR
Transmission: 700R4 w ProBuilt
Axle/Gears: 9 bolt 4.11
Re: Converting LB9 to use LS wiring harness
No offense taken, vortec. Those parts worked for me a number of years ago but I read your posts diligently and gladly defer to your considerable expertise.
Brian
Brian
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