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  1. #1

    137+4 supercharger impeller RPM' range?

    I was thinking of just doing the 137+4 and injectors will it shoot the RPM over the 8350? Didn't want to have do valve train because IF I have to do that might as well do RIVA XXX charger. I have the 21R Solas on it now, Fizzle, and 8350 tune


  2. #2
    JFizzleJR's Avatar
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    You would need to add pitch to the prop. You won't need a valve train upgrade if you keep your current RPM limit in place.


  3. #3
    yeah, I just don't want to be constantly bouncing off the rev limiter either guess another $600 parts and labor to beef valvetrain up would be worth it $$$

  4. #4
    JFizzleJR's Avatar
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    Quote Originally Posted by craig41071 View Post
    yeah, I just don't want to be constantly bouncing off the rev limiter either guess another $600 parts and labor to beef valvetrain up would be worth it $$$
    You will definitely get a lot more performance by bumping up the rev limit to accommodate the added boost than just pitching the prop alone and staying at 8300.

  5. #5
    ATNryan's Avatar
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    A lot of people say our ski's don't come alive until after 8500 rpm's. So you might as well do the valvetrain now and reap the extra performance. I play on running mine ski around 8800 this year just to see the difference.


  6. #6
    AtoMIC_OraNGE greenbullet's Avatar
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    8800 rpm. East side fully built ported head and a 140 charger and now your talkin ..... Hang on

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  8. #7
    dpracing's Avatar
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    137 won't make full boost until you're over 8600

  9. #8
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by dpracing View Post
    137 won't make full boost until you're over 8600

  10. #9
    Eastside Powersports Slow 91's Avatar
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  11. #10
    dpracing's Avatar
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    That's what I remember from my testing...... He wants to stay below 8300, it won't make 15 psi that low.

    its advertised to make 15 at 8500, I still remember not seeing 15 till a little beyond that on my data logger....

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