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  1. #1
    b_dolla44's Avatar
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    help me decide on impeller...info inside...

    heres what i have
    04 RXP 160 hrs bone stock
    I have ordered riva metal clutch washers and mcmaster spring washers and shims. SC has 40 hours since last OEM rebuild.
    opas block offs
    riva stg 1 air intake or i can make a 4 inch system...
    Home made free flow exhaust.
    riva stg 2 SC wheel not sure its a gen1 or 2 (not sure when it was purchased new)
    reverse bucket trimed
    rideplate holes filled

    impeller choices purchsed the 14/19 and 15/20 used
    have Brand new OEM impeller = deff not usings it
    stg1 14/19
    stg 2 15/20

    It stills has the OEM intake grate and doesnt have a pump wedge....yet....

    guess the question is do i run the stg1 prop with the 3in intake and leave out the sc wheel? = guessing 8100 rpms
    put wheel in and run 3 in intake with the 14/19 guessing rev limiter.
    run the stg2 sc wheel with 3 in intake and stg 2 prop? = guessing low rpms. 7800-7850
    Or make a 4 in intake stg 2 wheel and 15/20.... guessing this will still be low on rpms 7900-7950

    riding on the ohio river in cincinnati oh... around 500 above sea level...
    also i have no clue what rpms i was at prior because i never rode it on the cermic washers

    what are your guys thoughts???? also im guessing on the rpms above judgeing off what others have noted


  2. #2
    Moderator Snoman's Avatar
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    Run the 14/19 with the 4 inch air intake and gen 2 Scer wheel..Tweek the prop to get your optimal RPMs..15/20 is gonna be to much to turn without an externa ICer..You will be able to turn it but your performance willl be shit..

  3. #3
    ABSOF*CKINLUTELY enjoisht's Avatar
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    agreed.... with my mods im spinning a untouched 14/19 at 8150... now that i have a intercooler and injectors i am upgrading to a 15/20... until the i/c and 42lb injectors i didnt have the power to spin a 15/20

  4. #4
    b_dolla44's Avatar
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    so 4in air 14/19 and stg 2 wheel. any idea of what speeds or rpm i should see with the 14/19 untouched???

  5. #5
    b_dolla44's Avatar
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    Bump. Anyone else?

  6. #6
    ABSOF*CKINLUTELY enjoisht's Avatar
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    Quote Originally Posted by b_dolla44 View Post
    so 4in air 14/19 and stg 2 wheel. any idea of what speeds or rpm i should see with the 14/19 untouched???

    if i had to guess 70-72

  7. #7
    Moderator Snoman's Avatar
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    My wifes ski was running solid 73 MPH with that exact setup

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