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  1. #1
    redbull's Avatar
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    Aug 2007
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    How to improve holeshot?

    With higher hp how is everyone ensuring a solid holeshot every time?
    From a dead stop or even a holding start my ski fights its way out of the hole (cavitation), after say 10 metres its all sweet.

    At the moment I'm running a c kit sc, xs ic, 4 inch air intake with a 14/19 skat 3 blade, worx grate and other bits and pieces. In the next couple of weeks i'm reprogramming my ecu to 8600 and adding black magic headers and a shorty gibson. I know my prop probably isn't right for this setup but I'm sure the same thing will most likely still happen with a 15/19

    So in short, with this level of performance what is everyone doing to ensure a good holeshot?
    Setback pump?
    setback impeller?
    Pump cones?

    Or is it trial and error, each ski is different?

    Any help or input would be sweet

    Thanks


  2. #2
    formerly Gold06RXP Turbo Nick's Avatar
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    Dayton, OH
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    http://www.4-tecperformance.com/inde...oducts_id=1096
    The Skat Trak drive shaft seal will help

  3. #3
    Richieb's Avatar
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    Change to a B kit(0

    The C kit is for top-end, Low and mid range is where you need the grunt, not top end.

    BTW, did you lighten the valve train parts?

  4. #4
    redbull's Avatar
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    Quote Originally Posted by Richieb View Post
    Change to a B kit(0

    The C kit is for top-end, Low and mid range is where you need the grunt, not top end.

    BTW, did you lighten the valve train parts?
    seadoo centre retainers are going in. we have another rxp with a B kit 8650 rpm limit and gibson. c kit on stock ecu with gutted box matches it for holeshot. with les's tuning i think it will be a monster. b kit is gettin swapped out for another c kit. It's not the boost numbers but the volume of air a C kit flows compared to the B which make them better all round.

    To cure the cavitation on take off I am thinking rotax pumps on both skis or try a pump extension kit. Anyone had any luck with any of these on there 2rude charged boats?

  5. #5
    R88ory RXP's Avatar
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    I would look at 1 of the available pump seals, they will cure alot of cavitation issues, coz with big hp the carbon seal can suck air into the tunnel under a hared accel. Also you may need to have some pitch put into the leading edge of your prop. I found that my top RPM was about right but I had big cavitation out of the hole so I had it pitched to 13 on leading edge and the issue went away. What prop are you running 3 or 4 blade?? R88

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