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  1. #1
    philys21's Avatar
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    Possible problem or just need repitched???

    Last year when I just had the intake, grate, 83mm nozzle, and free mods I had you repitch my 15/22 with a setback and I was right around 8100 all summer with 74-75mph.

    Now I added the wedge, waterbox, intercooler relocation kit, and BO's. At 3/4 throttle I'm hitting the rev limiter and my speed is down to 71mph or lower. Also have lots of cavitation from a start and in tight turns. I thought that my wear ring was bad but i checked the clearance and it was well within spec of what the manual said is allowed.

    Is this normal of how drastic the mods make the prop pitch or should I check some other things out?


  2. #2
    Wheels-X's Avatar
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    Yeah repitching would most likely be your problem there if you haven't neglected any maintenance or winterizing, etc. You're talking mods that, theoretically, should add 3-4 mph...though this is a stretch. But if you were near the limiter before you should absolutely be on the limiter now I would assume. Look up repitching in the how to section its's very simple, just need an impeller removal tool, preferably the long one for repitching...

  3. #3
    philys21's Avatar
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    Alright thanks. I just wanted to make sure I'm not missing something.

  4. #4
    JFizzleJR's Avatar
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    I don't see any mods that you added that should yield RPM gains. The cooler temperatures are probably giving you 200+ RPMs. Try a 80mm nozzle ring before you go crazy. Dinging up the prop in any way by hitting a rock etc. can easily cause a gain in RPM and a loss in speed. Don't ask me how I know

    Quote Originally Posted by philys21 View Post
    Last year when I just had the intake, grate, 83mm nozzle, and free mods I had you repitch my 15/22 with a setback and I was right around 8100 all summer with 74-75mph.

    Now I added the wedge, waterbox, intercooler relocation kit, and BO's. At 3/4 throttle I'm hitting the rev limiter and my speed is down to 71mph or lower. Also have lots of cavitation from a start and in tight turns. I thought that my wear ring was bad but i checked the clearance and it was well within spec of what the manual said is allowed.

    Is this normal of how drastic the mods make the prop pitch or should I check some other things out?

  5. #5
    Bob 1tommygunner1927's Avatar
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    Lets think about this.......wedge lifts front of hull for less water friction on the hull, & the waterbox added a couple of HP. This alone will add some rpm/speed. Combine that with excellent weather conditions and suddenly you're over the rev limiter......in summer heat your ski was previously at 8100 rpm and now in cooler temps its over the rpm limiter.

    Add more pitch to the impeller......but have it pitched for the summer heat. Keep a weather log of every ride and document performance changes of mods added.

  6. #6
    bigvincent's Avatar
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    Quote Originally Posted by 1tommygunner1927 View Post

    Add more pitch to the impeller......but have it pitched for the summer heat. Keep a weather log of every ride and document performance changes of mods added.
    I think that's a great idea about the log. I was just curious if people have two sets of props or just use the adjustable nozzle (or a combination of both) for different weather conditions?

  7. #7
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by bigvincent View Post
    I think that's a great idea about the log. I was just curious if people have two sets of props or just use the adjustable nozzle (or a combination of both) for different weather conditions?
    I think the pervailing wisdom is having 2 impellers: one pitched for summer, the other for much cooler temps, used with a fixed venturi of 83mm. But because I'm lazy, its easier to use an adjustable venturi. I want my impeller pitched for summer using an 84mm ring, even an 85mm.....and go tighter for cooler temps, or other conditions.

    I think the adjustable venturi is better because you can fine tune RPMs for different barometric pressures from day to day, or even on the same day. Each ring is worth about 40-50 rpm.

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