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  1. #1
    home of the dislexic fingers breon's Avatar
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    stage 2 pos vortec 15/20r low rpm

    running a stage 2 with the pos vortec wheel and a 15/20r prop. my ski only spins 7600 to 7700 rpm ...people are saying keep the 15 20 when i install the rude and rotax ecu ...so that leads me to believe that a 15/20 is to steep for a stage 2 hence why the rpm is down??does this sound about right ??? or do i have a problem w my current set up


  2. #2
    Matthew K ReDevilRXP's Avatar
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    Nevermind i just re read the post and answered my own question
    Last edited by ReDevilRXP; 10-07-2007 at 11:03 PM.

  3. #3
    bttek1's Avatar
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    Yes, you need more power in order to turn the 15/20. Depending on what exit venturn nozzle you are using also determines the max rpm's that you can achieve with that prop.

    With the Rude Charger, external IC and a bunch of your usual bolt-on mods, using a 83mm nozzle you should be able to turn that prop 8400+ without much trouble. This is assuming that your boat is dialed in correctly air fuel wise.


    Quote Originally Posted by breon View Post
    running a stage 2 with the pos vortec wheel and a 15/20r prop. my ski only spins 7600 to 7700 rpm ...people are saying keep the 15 20 when i install the rude and rotax ecu ...so that leads me to believe that a 15/20 is to steep for a stage 2 hence why the rpm is down??does this sound about right ??? or do i have a problem w my current set up

  4. #4
    home of the dislexic fingers breon's Avatar
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    that is about what i have determined the 15 20 is what riva recomended ...why i am not sure but thanks for the conformation

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