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  1. #1
    LTX Master


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    Dec 2011
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    Louisiana
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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
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  2. #2
    LTx Guru


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    Apr 2013
    Name
    Fred
    Vehicle
    1994 Formula - SOLD
    Location
    Central NJ
    Posts
    2,279

    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 Master


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    Dec 2011
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    Louisiana
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    600

    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
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  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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