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  1. #1
    EH Team Water Pig's Avatar
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    RXPX vs RXP Nozzle & Venturi

    I've seen the ads for WTB stock RXP nozzles (83mm) but I can't find details on why.
    What is the size of the stock RXP venturi & steering nozzle compared to the RXP-X venturi & steering nozzle?
    Is there hole shot gains to be had by changing them up or is it just top end?
    Inquiring minds want to know.


  2. #2
    Moderator Snoman's Avatar
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    RXP 215 Hp ski venturis are 83mm while the X boats are 87mm..The smaller diameter usually equates to higher top speed while the bigger equates to better hole shot..These guys want the 83 for more top speed..

  3. #3
    REID2168's Avatar
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    the stock RXPX pump nozzle is 87mm and the stock RXP pump nozzle is 83mm..........people are going to the RXP nozzle on their X models for top speed performance usually after modding their skis....... it also helps lower rpms after modding for more power and getting the prop dialed in and is a faster top end nozzle without sacrificing to much holeshot.........to get these speeds u need the smaller RXP 83mm nozzle and it helps get the correct pitch because due to pump limitations/depth with the X 87mm nozzle installed and higher performance u cannot usually get the prop dialed without it hitting the rear of the pump.......u need the 83mm nozzle to help lower rpms so u have the abilty to pitch the prop far enough and still fit in the pump and turn over without hitting the back of the pump to get to these speeds people are tryin to attain! in other words the larger 87mm stock X nozzle obviously makes more rpms and most times depending on the mods and power added to the ski u cant pitch the prop far enough to get the rpms reduced enough with the stock X nozzle because it will hit the back of the pump when adding power and trying to get the most top end out of your X boat! this is my personal experience thus far and others may have other reasons but this is the main reason most are doing this mod! good luck!

  4. #4
    EH Team Water Pig's Avatar
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    Venturi & Steering Nozzle Questions

    Thanks guys, that makes sense.
    I know that with my old XP800 the R&D (venturi-nozzle) 85/83mm setup used to be the choice of many guys that raced.
    I was told that for best performance you needed to get the venturi and steering nozzle sizes within a couple of mm of each other.
    Is that the case with the 4-tec's?
    For best hole shot and overall performance which steering nozzle works best on a PX with the (1) RXP 83 mm venturi? (2) RXP-X 87 mm venturi?

  5. #5
    Eric Ocman's Avatar
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    I have been told that you get a better holeshot with the 83 and a proper pitched prop.

    This and the 1mph gain is why I switched.

  6. #6
    EH Team Water Pig's Avatar
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    Venturi Nozzle Questions

    So you run the RXP 83mm venturi with the stock RXP-X steering nozzle?

  7. #7
    Dave Sharp dav_dman's Avatar
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    Quote Originally Posted by Water Pig View Post
    So you run the RXP 83mm venturi with the stock RXP-X steering nozzle?
    both use same steering nozzle.

    The higher top end makes sense..nozzle size has been used forever in hole shot /top end mods for races.

    But the stmt about better holeshot with 83 vs 87 because of prop dialing didnt make sense to me. Not disputing, just wondering if Ocman actually real world got better holeshot or is that just what people told him.

  8. #8
    MPower's Avatar
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    It's all about the combo of the prop pitch and nozzle, they work together. I had my ski setup to run 87mm during the summer and 83mm during the winter and prop pitch stayed constant. I preferred the 87mm.

  9. #9
    Eric Ocman's Avatar
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    Re: RXPX vs RXP Nozzle & Venturi

    might be a mind thing but mine feels better with the 83. Could be dukes prop job though.

  10. #10
    Dave Sharp dav_dman's Avatar
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    [/quote]
    Quote Originally Posted by Water Pig View Post
    So you run the RXP 83mm venturi with the stock RXP-X steering nozzle?
    both use same steering nozzle.[/quote]

    you make a good point. When running the 83 on the xboat one might want to use JD's steering nozzle ring to bring the steering closer to the nozzle diameter.

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