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Thread: rxt-x 8120 rpm

  1. #1

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    rxt-x 8120 rpm

    hello everybody again , my ski is running great with just the r&d grate and air filter but it is turning 8120-8140rpm on the water was wondering how much the 15/22r impellar would bring my rpm's down? boat runs 70.5 to 71.5mph now on radar with no cavitation


  2. #2
    Moderator Franko's Avatar
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    Get the 15/22. Your RPM are too high for optimum performance. You should be turning 8000-8040 RPM. The 15/22 should get you there.

  3. #3

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    Quote Originally Posted by chokehold View Post
    hello everybody again , my ski is running great with just the r&d grate and air filter but it is turning 8120-8140rpm on the water was wondering how much the 15/22r impellar would bring my rpm's down? boat runs 70.5 to 71.5mph now on radar with no cavitation
    +1

    Yup... right there with ya on my P-X (check sig). I turn 8160 solid with 8180 flashes @ consistant 71.X mph during the first 20 minutes or so of riding. 70 deg water. 65 deg air (mornings). Then I settle down to 8140 with flashes of 8160 (even on flat water), but still with 71+ consistant. I'm hoping that the prop will bring my RPM down too (and give more speed ). I picked up the Free-flow exhaust too (for $80 can't go wrong), so I may need to re-pitch the 15/22 even (I hope not).

    I hope to get it all installed this coming weekend (when I get back from Iowa ... installing new firewalls and wireless at one of our sites).

    -=Mike G.

  4. #4
    West Texas RXP skoepp's Avatar
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    Ithink the 15/22 will be perfect right out of the box for you. I ran 8,060 rpm on T-X last weekend at 500 ft and 100 degrees.
    When i am at home 2,600 ft. i ran 7,800 rpm with exact same setup, so i run my stock impeller with + mm and run 8,060 rpm.

    I would think that if you compare stock X prop to 15/22 you talking like 200 to 250 rpm difference.

  5. #5
    Aimstylus's Avatar
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    How many hours on it? I'm at 7, can't wait to hit the 8-10mark on my RXP.

  6. #6

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    Quote Originally Posted by Aimstylus View Post
    How many hours on it? I'm at 7, can't wait to hit the 8-10mark on my RXP.

    You need to catch up! I hit 27 hours this week and it's about 6 weeks old

  7. #7

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    I have the 15/22 on my rxt x and he goes down 200rpm to 7860 so with the prob you can become a good turn

  8. #8
    Laxcrazy23's Avatar
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    whats the stock prop at?

  9. #9
    Banned User
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    Progressive Pitch 13-17 over 145 degrees
    Progressive Pitch 23 degrees over the last 15 degrees
    Total blade length in degrees is 160 degrees
    Total blade pitch average 13/17/23

    This is from the R&D website.

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