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  1. #1
    GGG's Avatar
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    RXP Nozzle on conversion ski question

    Just finished my project and I'm running 75 at 8180. It has a 255 setup in it. I just got an rxp nozzle how much will the rpms drop?

    http://www.greenhulk.net/forums/show...ec-powered-MSX


  2. #2
    mrbtd's Avatar
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    Assuming you were running the 87mm ? If so maybe 40-60. On highly modified set ups there is more of a difference when it comes to weather.

    I ran an 87mm @ 8140-8160 and in the same weather turned an 83mm RXP nozzle @ 8080-8100.

  3. #3
    mrbtd's Avatar
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    I should also add your target should be 8100 in this cool weather so when it heats up you can be @ the 8040-8080 range (unless you plan on playing with props and nozzles all year).

  4. #4
    GGG's Avatar
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    Ya so the nozzle alone isnt gonna do it for me. I still have to get the 4 inch intake too. Im running the stock intake with a stainless filter and the rubber hose has a slight kink in it. Im probably gonna end up on the limiter. but thanks for the advice. Did you gain any MPH by swapping nozzles?

  5. #5
    richrxp's Avatar
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    Quote Originally Posted by GGG View Post
    Ya so the nozzle alone isnt gonna do it for me. I still have to get the 4 inch intake too. Im running the stock intake with a stainless filter and the rubber hose has a slight kink in it. Im probably gonna end up on the limiter. but thanks for the advice. Did you gain any MPH by swapping nozzles?
    I gained 2.5 mph,going from 87mm to 83mm.

  6. #6
    Moderator Insanediego Joe's Avatar
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    Take the filter off your intake and gain 75-100 rpms.

  7. #7
    GGG's Avatar
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    Well considering my 75 mph was read with the ski popping out of the water from chop. It looks like I might be right at 80 and the only mods to the engine are a gutted waterbox, a 160 thermostat, and a 4 inch intake. Im more than pleased with that

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