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  1. #1

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    How much MPH gain to you get per 100 rpm you gain??

    I was told for every 100rpm you get 1mph on an rxp. Is there any truth to this? I have a buddy whos ski we are just starting to play with. Its an 05 rxp he bought it n the guy just put a brand new solas 14/19 prop and wear ring.
    We have since added Speed freaks 4" front air, PPG exhuast, trim bucket, and filled the ride plate holes n side of the plate. Took it out today for a test ride and it would only turn 7750rpm and on my garmin gps it went 67.8 mph. That was with a 1/2 tank of gas and it was 90 degrees with 81 degree water temps. It seems like the prop is a bit much for the mild mods. Just wont turn the 8100-8150 rpm where Id like it to be.

    This week we are gonna order a riva grate, and let eric speed freeks repitch the prop and do a set back mod on the prop as well. We are hoping for like 71 mph once its all set and done? Do you think this is acheivable? Thanks guys.


  2. #2
    home of the dislexic fingers breon's Avatar
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    about 1 mph per 100 rpm

  3. #3
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by breon View Post
    about 1 mph per 100 rpm
    Yes.

  4. #4

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    Thats whats I was told but wasnt sure. So basically if we get this ski to turn another 450 rpm it should pick up 4mph which for a very lightly modded ski we are pleased.

  5. #5
    mac_man_luke's Avatar
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    RPM per MPH depends really on the prop pitch

    Coarser the prop, more mph per rpm you will get.

  6. #6
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by ModularJunk View Post
    Thats whats I was told but wasnt sure. So basically if we get this ski to turn another 450 rpm it should pick up 4mph which for a very lightly modded ski we are pleased.
    Pretty much.

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