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  1. #1

    Anyone with a 137+4 on RXT 260? Tell me about real life gains?

    Thinking

    If I purchase the Engine Tech 137+4
    1100 injectors
    already have fizzle and 20R impeller
    and get whatever tune v-tech says

    will I be hitting the rev limiter?
    What advantage would the valvetrain kit give if any with that setup?


  2. #2
    www.eastcoastpwc.net Scott's Avatar
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    Just do it. Do it all.

    You'll also need a fuel pressure regulator

    May have to pitch to keep it off the limiter.

    Valve train setup saves your motor due to high revving.

    You'll be happy!!

  3. #3
    Boost addict hotbird's Avatar
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    Stepping up the rpm will gain you more boost and more power.

    Good fuel regulator.
    Injectors
    Wheel
    Spring kit
    Prop pitch
    4" intake and flame arrestor removal.
    Vtech / motec

    =

  4. #4
    JFizzleJR's Avatar
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    The main function of the valvetrain kit is to allow you run higher RPM safely. The heavy duty springs/retainers don't add performance by themselves. But raising the rev limit will do wonders for performance You can run a V-Tech 8375 tune and keep the stock valve train. That will get rid of all stock computer limiters and will also let you run about 150 RPM more.

    Quote Originally Posted by craig41071 View Post
    Thinking

    If I purchase the Engine Tech 137+4
    1100 injectors
    already have fizzle and 20R impeller
    and get whatever tune v-tech says

    will I be hitting the rev limiter?
    What advantage would the valvetrain kit give if any with that setup?

  5. #5
    imp0ster's Avatar
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    you'll be on any rev limiter unless it's set to 9300+.

  6. #6
    JT jpt7779's Avatar
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    Pittsburg, Texas Lake Bob Sandlin
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    I see no mention of monitoring AFR, like with a LC-1……..got to have it to set the FPR correctly……and you need a good data logger and software.

    You can really uncork that beast but requires some smart planning!

  7. #7
    with those mods do you think i'll be over the 8350 rpm?

  8. #8
    imp0ster's Avatar
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    no thinking about it. It's a guarantee and if you plan on touching that SC you better install a wideband o2 and monitor your AFRs

  9. #9
    AtoMIC_OraNGE greenbullet's Avatar
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    The sound will make it all worth it ! Just make sure to monitor afrs and have a rrfpr

  10. #10
    Quote Originally Posted by craig41071 View Post
    Thinking

    If I purchase the Engine Tech 137+4
    1100 injectors
    already have fizzle and 20R impeller
    and get whatever tune v-tech says

    will I be hitting the rev limiter?
    What advantage would the valvetrain kit give if any with that setup?
    We used the 137 +4 and got 8900 and 87 mph GPS speed w out Vtech tune.

    And 20r, but all impellers we got delivered where differnt pitched even tho it said the same on the box..

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