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Thread: Impeller help

  1. #1
    agibbs's Avatar
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    Impeller help

    Hey guys,

    I'm am about to put a Rotax Racing Intercooler on my Stage I (with GH waterbox) RXT. What impeller is best for this setup, my conditions are similar to that of Florida, mid 70's to mid 80's.

    Also, what impeller would I need if I were to add in addition to the above setup:

    1) Green Supercharger wheel with a Rude rising rate regulator.

    2) '08 X Supercharger with a RRR.


    Thanks


  2. #2
    agibbs's Avatar
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    anybody?

  3. #3
    Focker Foggy's Avatar
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    I would say start with a Solas 14/19.. You'll just have to see where your Rpm's and Mph are and then tweak the pitch a little to get it into the sweet spot

  4. #4
    agibbs's Avatar
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    Thanks, is that a rotax intercooler in your signature? You run a rear exhaust or no? jw because you said it doesn't fit!!!

  5. #5
    15/20 with the addition of the S/C IMO!

  6. #6
    agibbs's Avatar
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    I would feel better with a 15/20 now that you brought it up, the rpms are at 8150 right now, I could always depitch a little if need be.

  7. #7
    Rxt with a riva air intake, green wheel (or Rotax wheel) and a riva grate with no opas in fresh water is perfect with a 14/19 4-blade depitched to 14/18.5. In salt water you'll lose 150 rpm's or so. I'de say with an intercooler you'll be close with the 14/18.5. With an intercooler and sc'r wheel repitch to 14/19.5 or get a 15/20 and take some out.

    Mark

  8. #8
    Focker Foggy's Avatar
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    Quote Originally Posted by agibbs View Post
    Thanks, is that a rotax intercooler in your signature? You run a rear exhaust or no? jw because you said it doesn't fit!!!
    I haven't gotten it installed yet. I ordered it and didn't know that I would have to remove the resonator, so I'm on the fence about installing it. I like the quiet stealth mode.. I still haven't been on water with the ski yet, still winter here (zero hours).
    Come On Spring!!!

  9. #9
    ctriverguy's Avatar
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    Our rxtwill have an s2 set up:

    4inch front air
    s3 charger
    riva ic
    thru hull exhaust
    158 thermo
    42lb injectors


    I was advised and purchased the 15/20r.

    if it needs more fine tuning, we will add the venturi nozzle.

    Will let you know how it works out, in 2 months

  10. #10
    JFizzleJR's Avatar
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    keep in mind the s3 charger has a little more pull than the stock s/c or green wheel ...

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