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  1. #1
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Boost Pressure @ 8100rpm

    Does anybody have the data on how much boost each of these aftermarket sc's produce @ 8100rpm.

    Riva stage 3
    Les B-kit
    Rude

    With external IC.


  2. #2
    Banned User
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    Riva S3 - 8400 RPM - 10.8 Lb
    Rude/B-kit 13 Lb

    I don't know what they push at 8100...

  3. #3
    MoTeC_Master's Avatar
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    I logged boost readings from an RXP with a stg1 SC impeller.

    Its boost is about 8.8 psi @ 8150- 8200.

    I have logged it over 10 times it will not do over 9psi.

    we checked the clutches metal washers everything was ok...
    It makes 7 psi at 7400-7500.
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  4. #4
    MoTeC_Master's Avatar
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    Dunno about the big ones your talking about until I try one.

    People say a lot of things you will not know till you see for yourself.

    But the big ones will make more boost

  5. #5
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Thanks Motec Master

    The reason I'm asking is that, for reliability sake I want to keep rpm as close to stock as pos. I run indurance so finishing is paramount. But! on flat water there are still the odd boats that have a slight speed advantage. I am running the new Les Cooke 10lb wheel. 10lb @ 8100rpm? and are wondering what SC would provide more boost at 8100rpm, providing I can can still fuel it with a stock ecu.

    Any input would be helpful.

  6. #6
    1101rwhp Wolverine's Avatar
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    My stageII riva boost [email protected]
    Rotax wheel [email protected]
    Riva stageIII [email protected]
    The Rude charger [email protected] 13.5psi at 8400

  7. #7
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Thanks Wolverine

    So maybe Rude charger is at 11+ish psi @ 8100rpm. What about volume? Could 42lb injecters work with a rude sc and stock ecu @ 8100rpm and provide an improvement (hp) over my current setup? With prop pitch?

  8. #8
    CRS's Avatar
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    B kit is 11psi at 8100 14 psi at 8450 cross my palm with enough silver and you could borrow mine for a test and I'll throw in a boost gauge with it. Stop worrying at man,do you want to win every round.Leave some crumbs for us with the fast but not always reliable ski's eh Ginger

  9. #9

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    Speak for yourself a!

  10. #10
    CRS's Avatar
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