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  1. #1
    jcc011185's Avatar
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    impeller pitch and rpm question

    Hey guys...

    ok so on my modified rxp... which has riva rear air intake, riva s3 supercharger with rxpx injectors fizzle intercooler, riva scoop grate, solas impeller (14/21 I think)

    I recently added jet works trim nozzle kit, fizzle opas kit, and repitched the solas... I took off 2mm of pitch which brought my rpms up to 8050-8100 from about 7800-7900 rpm but it seems like im running slow! I hit 72.4 today it used to run better then that do you guys think I should increase the pitch again to drop rpms and increase top speed? Now that I have the opas kit and my porposing is gone I think I will go back to the stock grate which should help a bit but I should be 78 or so I would think by now?


  2. #2
    jcc011185's Avatar
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    Its a solas 15/20...

  3. #3

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    This one has me guessing, I would think you should not need to remove pitch on that prop. Almost everyone runs that prop plus some pitch with mods. My guess is your down on hp, maybe sc slip?

  4. #4
    Having Fun jp1300r's Avatar
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    Whats a jet works trim nozzle kit? Maybe that is slowing you down. Take some pictures and post them up.

  5. #5
    83.0 @ 8400 jhill19's Avatar
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    Quote Originally Posted by jcc011185 View Post
    Hey guys...

    ok so on my modified rxp... which has riva rear air intake, riva s3 supercharger with rxpx injectors fizzle intercooler, riva scoop grate, solas impeller (14/21 I think)

    I recently added jet works trim nozzle kit, fizzle opas kit, and repitched the solas... I took off 2mm of pitch which brought my rpms up to 8050-8100 from about 7800-7900 rpm but it seems like im running slow! I hit 72.4 today it used to run better then that do you guys think I should increase the pitch again to drop rpms and increase top speed? Now that I have the opas kit and my porposing is gone I think I will go back to the stock grate which should help a bit but I should be 78 or so I would think by now?
    No way 78 maybe 74-75 tops with your mods.

  6. #6

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    JP1300R--Good question.

  7. #7
    jcc011185's Avatar
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    Ok I was hitting above 76 a couple seasons ago. I took the impeller off again and gave it back 2mm so the rpms are back to 7700ish and switched back to the stock grate yesterday... though the tank is still full i'm having a hard time so far at even hitting 70! Should I be trying to reduce the pitch to get the rpms close to redline or what should I do here. Surely the fizzle opas hull extension kit is not taking that much speed! HELP!

  8. #8
    jcc011185's Avatar
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    This is the steering nozzle reducer... it has good reviews here on greenhulk and I do notice quicker easier steering ... its jet draft not jet works...

    https://www.google.com/url?sa=t&sour...zvojKxsCamM30g

  9. #9
    Mothman's Avatar
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    In the bike world, we make ONE small change and test. You're removing/installing many important speed related parts. You will chase your tail for a long time if you keep doing this.
    I would start back to where it was initially, then make one small change, such as removing the steering reducer. Reduction nozzles are for fine tuning your rpm and can be messed with later.
    If that helps, then make another small change like swapping intake grates. If it hurts performance, swap back and try something else.
    Good luck!

  10. #10
    jcc011185's Avatar
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    I mean does the extension opas kit hurt the speed that much? I had just regular blockoff plates before...

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