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GSR Pistons in LS

Discussion in 'Engine Building' started by ExoticRides, Apr 23, 2007.

  1. ExoticRides

    ExoticRides New Member

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    I have a Ls swap im doing, and im boosting it. I wanted to use LS rods and GSR pistons with the turbo. I will only be running around 10 pounds of boost, but im not quite sure what the compression is going to be with the GSR pistons. I know the LS internals will hold somewheres between 300-350 HP before giving out.. So im not quite sure what the best route to go is, (on a budget). I already ordered the pistons and they are USDM p72AO (B18C1). Thanks
     
  2. formby

    formby learning in progress

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    why the gsr pistons?
    use the LS 81.5mm with some nice rings.

    lower CR with cast pistons will do better than having a little higher CR and cast pistons.
     
  3. ExoticRides

    ExoticRides New Member

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    Well I figured that the GSR pistons would hold up better. So LS internals are going to be better for a turbo settup?
     
  4. jeffie7

    jeffie7 Wrong Whole! VIP

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    Problem with the GSR pistons is you'll bump your compression up. This will make it harder to run boost on a safe level.

    LS motors IMO are the best (safest) ways of doing a stock motor turbo car.
    I'd just leave it be and down the road when stuff gives out, do a nice build.
     
  5. ExoticRides

    ExoticRides New Member

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    Thanks bro, I want to do a mild build right now, Just mess with the head a little bit and maybe run 12 or 13 pounds. I was thinkin 5 angle valve job, and a port and polish.
     
  6. ExoticRides

    ExoticRides New Member

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    I am running a turbo that is out of a ford probe, so yes it is small
     
  7. stmotorsports

    stmotorsports Senior Member

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    yeah definitely wouldn't go with the gsr pistons, as mentioned your raising your cr for no apparent reason plus the wrist pin widths are different between B16/LS and GSR/ITR- they won't fit quite right on the LS rods.

    If those gsr pistons are .25 over I might be interested in them tho- they'll fit nice in my motor :)
     
  8. TheManRSW

    TheManRSW TheManRSW

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    High compression+turbo=A decent engine if tuned properly or a blown engine if you don't know what you're doing.
     
  9. formby

    formby learning in progress

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    sure but he has cast pistons

    HC forged pistons and low boost is okay.... but the cast pistons is his weak link
     
  10. TheManRSW

    TheManRSW TheManRSW

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    True, but I would think with that high of compression plus boost, if he doesn't have a good tune and premium gas, alcohol injection, or semi race gas...he is flirting with detonation. The stock cast pistons would not be the way to go, just as Formby stated.
     
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