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  1. #1
    LTX Regular


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    Default Lt1 vs. Ls1 fuel pressure

    Trying to put a fuel system together on my project. I'm looking at using an LS1 style fuel system with the regulator/filter. If I cap off my return line at the fuel rail, the fuel rail will have ~58psi versus the stock ~47psi. Will 58psi be too much for my stock LT1 injectors? It seems like someone told me before it was ok, but I thought I'd ask if any here have done it before with no issues.
    Nolan
    '94 Z28 Bone stock,4l60e
    '97 SS SLP,T56,385 stroker,AFR210,XFI292,NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56

  2. #2
    LTx Guru


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    1994 Formula
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    Default

    Stock LT1 pressure is 3 bar = 43.5 PSI, with a 41-47 PSI tolerance. Stock LS1 pressure is 4 bar = 58 PSI. I don't know what the tolerance is. But the stock LT1 Delphi Multec injectors do not perform well at 4 bar. FIC has a video showing how they lock up. Scroll down to "Multec Injector Lock UP":

    https://fuelinjectorconnection.com/pages/videos

  3. The Following 4 Users Say Thank You to Injuneer For This Post:


  4. #3
    LTX Regular


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    Default

    Thanks Injuneer, I should have known you can't believe everything you read on the internet. The guy that told me it was ok was wrong. I trust the folks at FIC too, I've done business with them before.
    Nolan
    '94 Z28 Bone stock,4l60e
    '97 SS SLP,T56,385 stroker,AFR210,XFI292,NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56

  5. The Following User Says Thank You to JOATMON For This Post:


  6. #4

    Default

    Exactly what Injuneer said, They WILL lock up, seen that many times..

  7. The Following 2 Users Say Thank You to MoeHorsePower For This Post:


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