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  1. #1
    alex29573's Avatar
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    Prop and nozzle tunning

    If my ski is turning 8250 and I want to drop 100 rpms to gain mph what would be the better route?

    - pitch the prop
    or
    - put a smaller nozzle?

    which would result in a higher mph?

    On other ski's i understand that smaller nozzles make you loose holeshot/acceleration, but honestly on these rxpxs the hole shot rocks no matter what!


  2. #2
    West Texas RXP skoepp's Avatar
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    What are your mods?

    Ecu ?

  3. #3
    alex29573's Avatar
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    Just want to know what usually yields more gains - pitching the prop or changing the nozzle?


    stock ECU
    riva grate
    15/22r
    modded stock waterbox, free flow and rear exit exhaust
    4 inch kanaflex
    flame arrestor removed
    82mm nozzle
    50lb injectors
    some type of supercharger upgrade (seller said it was a rude but i dont know)

  4. #4
    Moderator Snoman's Avatar
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    You will see better Gaines by pitching your prop.

  5. #5
    West Texas RXP skoepp's Avatar
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    Prop will result in larger difference.

    The reason i asked what ecu, is that you are on the limiter at 8,250 rpm and X ecu.

    You asked which will result in higher rpm, you do not want to go higher rpm with that ecu.

  6. #6
    Moderator Snoman's Avatar
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    Quote Originally Posted by skoepp View Post
    You asked which will result in higher rpm, you do not want to go higher rpm with that ecu.
    Hes asking for higher MPH brotha,not RPM.......

  7. #7
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by Snoman View Post
    Hes asking for higher MPH brotha,not RPM.......

    duh????

    My bad!!

    He still on limiter tho.
    I bet its lean up top, sorry got off topic.

    Repitch your prop then nozzles.

  8. #8
    Mtuned's Avatar
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    I've read 81 nozzle is smallest to go.. from there repitch. I have not tested this it is only what I read.

  9. #9
    West Texas RXP skoepp's Avatar
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    On my RXP I prefer oem nozzle or 83 ring, as the 81 seems to dog the motor and hurt acceleration IME.

    On the T-X I liked the 84 ring. Even the 85 worked good.
    I might have gave up a tiny bit up top but holeshot, acceleration and handling were much better. It takes a big prop in good air to stay off limiter but worked great on the T-X.
    Just the way I roll!

  10. #10
    !!!! wave jumper !!!! 05_RXP's Avatar
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    aren't most of the guys with the x boats only going as small as 83mm

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