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Thread: Low RPMs

  1. #1
    Mutilation is the sincerest form of flattery bretster's Avatar
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    Low RPMs

    Hey guys.. After adding an x-charger, 42# injectors, wear ring, and 15/21 SOLAS prop to my otherwise stock 08 RXT, my rpms have dropped to around 7600 at WOT. Question 1) is my prop too tall for my mods? 2) how do I raise the rpms? Runs great up to the 7600 point and feels like it has more pull but just cant get it higher. Im thinking that a CAI would give me a couple hundred but even then wouldnt be at the 8100 point.


  2. #2

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    You need more power to turn that impeller-- external inter cooler, 4 inch intake, depending on which 42 you have a RRFPR and then take a little more out of the prop to bring it up to 8100

    I went the same route as you 6 months ago. I also liked the 160 thermostat...

  3. #3
    Mutilation is the sincerest form of flattery bretster's Avatar
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    Ok cool. I was thinking my prop was the prob. So I can either up the power to match the prop, or reprop? Great I know where this is heading.. More Power!!

  4. #4
    MSRXP's Avatar
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    Re-pitch the prop if money is your factor. It's easy, affordable, and did I mention easy. Send it to Jerry, give him a list of your mods and he will dial it in. If you plan on upgrading you will have to have it re-pitched again. It's a personal choice. Pitch now or pitch later or spend a chunk of change to turn it. Up to you.

  5. #5
    Mutilation is the sincerest form of flattery bretster's Avatar
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    Great advice. Im planning more mods for next summer so maybe I'll repitch it. But the general opinion so far seems to be prop is the problem. Whew!!! I was worried I had something else going on.. LOL

  6. #6

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    that all sounds about right. my '09 wakepro with x-charger, injectors, 4" intake, and pro nozzle with 83 mm ring is turning 7800 rpm with a 15/20 prop. i took the info from the RXP's people were talking about and got that prop, which is a bit much for the heavy three seaters. just have the prop re-pitched and it'll turn the higher rpm's. i need to take mine out and have that done. a 14/19 would have been better, but when i get an external intercooler, the 15/20 will be better.

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