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  1. #1
    Lbaronio's Avatar
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    HOLESHOT…Pump configuration, 15lbs boost...???


    I been upgrading lots of parts of my RXP, the last upgrade was a ET68-140 SC that gives an awesome power BUT I de been having some problems with Holeshot.
    I touch the rev limiter 4 times before it arrives to a medium speed…
    I already changed:

    -15/22R Solas impeller
    -Riva Stainless wear ring
    -Worx Grate
    -SKAT driveshaft bearing seal
    -R&D RXP Extended Pro Steering Nozzle

    I know the OEM nozzle comes in 83mm and 87mm for the RXP-X.
    Right know I’m hitting 8300RPM at WOT, I also need some RPM to gain too…
    I’m thinking in trying a 87mm nozzle, because I only have a RXP Pro-Series Reduction Nozzle with a 83mm, 82mm ring and a friend that could lend me hes RXP-X,s .
    What you think????
    Maybe a 85mm ring or pitching the impeller?
    Many thanks in advanced.
    Leonardo
    PD: I put all the nozzle down for holeshot


  2. #2
    SPEED COMES 1/10 @ A TIME SpeedFreeks Racing's Avatar
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    Bellows

    Before yor go nutz pitching props and changing rings you may want to try one of our (Bellow Bands) your problem may be in your bellows not in your prop and nozzle combo. Our Bellow Band has helped many ski's to improve hole shot and helped to cut down on cavitation or totally eliminate it in some cases.... check out the link bellow.

    http://www.greenhulk.net/forums/show...LLOW-BAND-quot

    Thanks, Erik SFR

  3. #3
    Moderator beerdart's Avatar
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    He is running the Skat seal..
    Quote Originally Posted by SpeedFreeks Racing View Post
    Before yor go nutz pitching props and changing rings you may want to try one of our (Bellow Bands) your problem may be in your bellows not in your prop and nozzle combo. Our Bellow Band has helped many ski's to improve hole shot and helped to cut down on cavitation or totally eliminate it in some cases.... check out the link bellow.

    http://www.greenhulk.net/forums/show...LLOW-BAND-quot

    Thanks, Erik SFR

  4. #4
    Lbaronio's Avatar
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    someone else have any other opinion?

  5. #5
    R88ory RXP's Avatar
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    Quote Originally Posted by Lbaronio View Post
    someone else have any other opinion?
    3 blade prop, you will prob need something like a 14/18 or 14/19. You could have a look at setting it back as well, mine is set back and its awsome but I dont have the mods on that boat like you have on yours, I have read that setting them back is not so good on the bigger power boats.

    Mine has just a 4" air, X SCer and Gutted thru hull exhaust with 42s on the stock internall ICer. I have the 14/18, right at 8100-150

    The holeshot and mid range on mine is crazy, it really pulls hard and hooks up much better then it does with a 13/21 solas I have.

    R88

  6. #6
    richrxp's Avatar
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    Try a plastic oem wearring,and see if the cavitation is still there,some people have some cavitation with the stainless wearrings.

    If your impellers is more tight in your wearring,you won't have cavitation.

    Then the next move is working on your impeller, to get the rpm's up around 8500 - 8600 rpm,s for the riva ecu.

    I would suggest to give it 2 mm ,and see where you are.

  7. #7
    Got Boost? psycho rxp's Avatar
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    U may wanna try the 83mm nozzle, it should help getting out of the hole. With modified skis, they bang the limiter harder, the larger the nozzle. Maybe could even try a different pump cone, or wet wolf's adjust a thrust..?


    http://www.4-tecperformance.com/inde...roducts_id=909

    http://www.wetwolf.com/

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