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  1. #1
    Matatan tocullo's Avatar
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    Prop advice needed!!

    I need an advice from the experts here, please! This is the deal I'm spinning a 15/20 at 8760 with the old fizzle cooler a 70-145 charger and 9000 rpm vtech tunned. Now I'm upgrading the cooler to the new high efficiency fizzle and my rpms should go up a little right? So the ? Is do I need a taller prop or should I repitch the 15/20?

    Thanks andy


  2. #2
    Moderator Snoman's Avatar
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    I would leave it,see were your RPMs are then IF needed adjust accordingly BUT i dont think youll need to do much if any tweeking...

  3. #3
    Matatan tocullo's Avatar
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    Quote Originally Posted by Snoman View Post
    I would leave it,see were your RPMs are then IF needed adjust accordingly BUT i dont think youll need to do much if any tweeking...
    Would I be ok spinning the engine so high on rpms? I have no work done to the engine other than rev racing springs and retainers. How much boost can the intake mani handle?

  4. #4
    83.0 @ 8400 jhill19's Avatar
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    Do you have the updated valves and 08+ sc oiler upgrade?

  5. #5
    Matatan tocullo's Avatar
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    Quote Originally Posted by jhill19 View Post
    Do you have the updated valves and 08+ sc oiler upgrade?
    Yes to both!

  6. #6
    GPRXP vspec1's Avatar
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    Quote Originally Posted by tocullo View Post
    Would I be ok spinning the engine so high on rpms? I have no work done to the engine other than rev racing springs and retainers. How much boost can the intake mani handle?
    These engines are very durable, we run 60-80 miles every weekend in the upper rpm range. Last weekend Duke, JP amd myself came back from catfish hotel to the ramp at 85+mph, so the skis were in the upper 8800 rpm range for an extended period. Its about a 7 mile trip from catfish to the ramp. Duke, Jp1300r and myself all try and pitch for around 9,000+ rpm. Boost #'s will be lower in the summer. Stock intake should be ok till around 17-18 lbs. Duke likes to put some extra bolts around the seams of the stock plastic intake when useing the higher boost chargers. My 68-140 makes around 16lbs at 9,000 in the cooler months. Right now I'm only seeing 14 .

    Jp's conversion ski has a bone stock engine out of his 2009 rxpx with a set of Riva springs in it. He ran 92.2 last week with a reflashed ecu and his 2 Rude @ 9100 rpm. Jp's mild ecu is set-up with a 9500 rpm rev limit, he also has a 10,000 rpm ecu

  7. #7
    Matatan tocullo's Avatar
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    Quote Originally Posted by vspec1 View Post
    These engines are very durable, we run 60-80 miles every weekend in the upper rpm range. Last weekend Duke, JP amd myself came back from catfish hotel to the ramp at 85+mph, so the skis were in the upper 8800 rpm range for an extended period. Its about a 7 mile trip from catfish to the ramp. Duke, Jp1300r and myself all try and pitch for around 9,000+ rpm. Boost #'s will be lower in the summer. Stock intake should be ok till around 17-18 lbs. Duke likes to put some extra bolts around the seams of the stock plastic intake when useing the higher boost chargers. My 68-140 makes around 16lbs at 9,000 in the cooler months. Right now I'm only seeing 14 .

    Jp's conversion ski has a bone stock engine out of his 2009 rxpx with a set of Riva springs in it. He ran 92.2 last week with a reflashed ecu and his 2 Rude @ 9100 rpm. Jp's mild ecu is set-up with a 9500 rpm rev limit, he also has a 10,000 rpm ecu
    Cool, will stick to your advice!

  8. #8
    GPRXP vspec1's Avatar
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    Quote Originally Posted by tocullo View Post
    Cool, will stick to your advice!
    We all run either straight av gas or a mixture of 93 with av gas with the higher boost.........none of us trust the shitty gas we have here in Florida.

  9. #9
    Matatan tocullo's Avatar
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    Quote Originally Posted by vspec1 View Post
    We all run either straight av gas or a mixture of 93 with av gas with the higher boost.........none of us trust the shitty gas we have here in Florida.
    Where you guys get the av gas? One more ?? I never has never check my head torque, should I retourque the head just to make shure that is within specs? Is that necessary?

    Thanks

  10. #10
    83.0 @ 8400 jhill19's Avatar
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    Quote Originally Posted by tocullo View Post
    Where you guys get the av gas? One more ?? I never has never check my head torque, should I retourque the head just to make shure that is within specs? Is that necessary?

    Thanks
    Yes, I would recheck it after a few heat cycles

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