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  1. #1
    Mtuned's Avatar
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    Pitch Vs Rpm. Your speed.

    Since you can take out ALL engine mods from this equations.

    List your:


    Impeller
    RPMS
    GPS Speed
    Ski

    15/19
    8900
    83.3
    2006 RXP


    Trying to find the path to more top speed. And Knowing what Rpms vs pitch will help me see where i need to end up with power. Or if my issue is with the hull.

    For example if people are only seeing 89-90 MPH with a 15/22

    Then it would be almost impossible on the stock RXP hull to do same speed with 15/19

    I want this thread to better give us an idea of speeds and props.


  2. #2
    Moderator Snoman's Avatar
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    Impeller 15/22
    RPMS 8120
    GPS Speed 81.1
    Ski 06 RXP

  3. #3
    Mtuned's Avatar
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    Quote Originally Posted by Snoman View Post
    Impeller 15/22
    RPMS 8120
    GPS Speed 81.1
    Ski 06 RXP


    Judging by reading that, You can tell your on a large charger 2rude, rude 140r or et 68-140.

    Pretty good thread IMO

  4. #4
    Moderator Snoman's Avatar
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    2 Rude

  5. #5
    Moderator beerdart's Avatar
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    We need more data as everything affects impeller selection.
    What brand/model impeller?
    What nozzle size?
    What intake grate?
    Etc....

    Impeller ## are only used for reference and you tweek from there and every tweeker uses the ## different.

  6. #6
    dnielsen's Avatar
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    08 RXPX
    8340
    15/22R (untouched)
    80.6 MPH (straight up on the seat and in the heat)
    Pro-X Charger
    84mm ring
    R&D Grate
    Last edited by dnielsen; 11-16-2011 at 10:58 AM. Reason: added info

  7. #7

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    Impeller: 15/21
    RPMS: 8320
    GPS Speed: 78.4
    Ski: 08 RXPX
    Impeller Type: Skat SuperSwirl 3-blade
    Nozzle: OEM RXP 83mm
    Intake Grate: Worx

    Definitely like what your doing here and think it will be a great reference tool, but taking engine power out of the equation, ride-plate type, impeller root angle (what original pitch was, if pitch has been added or subtracted) and impeller type/brand will all play a role in efficiency/performance especially at higher RPM's. I realize your trying to remove as many variables as you can, and keep this as simple as possible, but just thought that worth mentioning.
    Last edited by boostaholic; 11-16-2011 at 08:49 AM. Reason: Or what Beerdart said, he hit post while I was spell/grammer checking ;-)

  8. #8
    Moderator Snoman's Avatar
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    Impeller 15/22
    RPMS 8120
    GPS Speed 81.1 best...80-80.1 average
    Ski 06 RXP
    What brand/model impeller? Solas 15/22R trued to 15/22 by Duke
    What nozzle size? 83mm
    What intake grate?Riva


    Anything else????

  9. #9
    Moderated
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    Impeller 15/22R
    RPMS 8850
    GPS Speed 85+
    Ski GPRXP, 2rude, ported, ems, doo pump
    Grate Dual Bar 1200

  10. #10
    Mtuned's Avatar
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    Quote Originally Posted by izz0 View Post
    Impeller 15/22R
    RPMS 8850
    GPS Speed 75+
    Ski GPRXP
    Grate Dual Bar 1200
    shouldn't you be 85+?

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