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Thread: X pump setups

  1. #1
    Live to RIDE. brendus's Avatar
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    X pump setups

    so had a run with the p-x having a stock 15/22r, r&d grate and reduction nozzle at 82mm. speed gain was minimal only 1 mph so i got 72.1 from previous. acceleration was the same as dads t-x with wings cut off grate .

    my revvs were 8080-8100 constant. so now i pitched the prop 1mm and put the stock nozzle bak on. i want the acceleration and try to get the most on a stock nozzle.

    i put 1 mm in the trailing edge and when i measured it, its now a 15/23 where before (stock) it was a 14/21

    any thoughts????


  2. #2

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    If I were at the stage you are, I would use the 82mm with the extra pitch you now have, just to see if the better RPM range is 8100 or 8000. Thats the side by side test Ive been trying to accomplish. I know the experts say the optimum RPM is 8000. I dont know??

  3. #3
    Live to RIDE. brendus's Avatar
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    i am interested in how you got 75mph on a stock nozzle???

    is that gps speed. what revvs were you turning?

  4. #4

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    Thats the funny thing, my ski is running 74-75 @ 8100 rpms w/ 86mm nozzle, 75-76 @ 8000 rpms w/ 82mm nozzle.

    I do all testing with gps, morning hrs, (since Im in Florida and is 95 degrees by days end), and fresh water.

    Im trying to figure out whats different about my setup, cause I havent heard anyone post similar numbers w/ stock nozzle??

    What is everyone else getting w/ Stage One setup????

  5. #5
    I have a full stage 1 kit set up with RD Grate. I am doing [email protected] 82mm ring. I am happy for now

  6. #6
    I hate things that don't work! SearayEX12's Avatar
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    Yeah finding a good speed with the stock nozzle is gonna allow for some awesome accleration. I don't care what people post, but the 82 mm definately causes loss in the holeshot.

  7. #7
    Live to RIDE. brendus's Avatar
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    i was getting 71mph with the stock nozzle and prop untouched and i was at 8160. so i thought i would put in a reduction nozzle prior to pitching the prop. lucky my mechanic gave me one to try. acceleration is lost but no a huge deal. one thing i did notice was that the ski didnt pull as hard out of turns.

    im back to the stock nozzle and 1mm added to the prop. so important to check the prop as my 15/22r was actually a 14/21 when i measured it.

    with the 1mm added i measured it to be 15/23

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