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  1. #1

    Little help dialing in rxp-x

    Just picked up a rxp-x w/24 hours with the following mods.
    4" intake knaflex (w/ big air filter on the end brand??) r&d intake grate, blow off valve, riva intercooler relocator kit, riva thru hull exhaust, riva sponsons, opas block offs.

    And it came with but not on: Riva intake manifold kit, and pump wedge

    i had it out sat and it was running 8140- 8180 rpm

    what should the sponsons be set at for best speed, high or low

    also what speed est am i running

    need a prop?

    Just love this boat want more speed


  2. #2
    REID2168's Avatar
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    my new RXPX has somewhat same setup with stock prop untouched, homemade partial 4" intake, R&D grate and ride plate holes filled went just over 72 @ 8140.....mine still only has 5 hours but my guess is yours might be a tad faster completely broken in! good luck!

  3. #3
    thanks for the reply. i just dont know much about tuning these things.

  4. #4
    King_Of_Fun's Avatar
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    You should be turning no more than 8000 - 8050 rpms. You need to add 1-mm to the trailing edge of you impeller... Ron

  5. #5
    MPower's Avatar
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    Quote Originally Posted by King_Of_Fun View Post
    You should be turning no more than 8000 - 8050 rpms. You need to add 1-mm to the trailing edge of you impeller... Ron

    Your ski will feel sluggish and slow turning those RPM's and it certainly wont be any faster.

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