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  1. #1
    mikelytle1077's Avatar
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    riva ecu prop pitch ?

    hey guys just installed a riva ecu and im running an et 137 +3 currently i have a 14/19 pitched to a 22 rpms are 7850-7900. how much pitch should i take out to get me to 8550-8600 i was thinking 3mm ? loving the throttle response of the riva


  2. #2
    Quote Originally Posted by mikelytle1077 View Post
    hey guys just installed a riva ecu and im running an et 137 +3 currently i have a 14/19 pitched to a 22 rpms are 7850-7900. how much pitch should i take out to get me to 8550-8600 i was thinking 3mm ? loving the throttle response of the riva
    Uhm...wow...somethin way off here.

    List of complete mods, please...uhm..nvm...'03gtx?

  3. #3
    RXP 260 X Short Course Veteran RXP244's Avatar
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    General Rule of Thumb, and I say General, but I find 1mm = 100rpm = 1mph. But of course as rpm increases, so does boost, therefore HP increases. Its a bit trial and error and I will have my pump in and out 2 or 3 times before I get my rpm spot on.

  4. #4
    it ain't the prop

  5. #5
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Quote Originally Posted by VaRedneck View Post
    Quote Originally Posted by mikelytle1077 View Post
    hey guys just installed a riva ecu and im running an et 137 +3 currently i have a 14/19 pitched to a 22 rpms are 7850-7900. how much pitch should i take out to get me to 8550-8600 i was thinking 3mm ? loving the throttle response of the riva
    Uhm...wow...somethin way off here.

    List of complete mods, please...uhm..nvm...'03gtx?
    Thats what I thought too. I thought that the 137 would have had that 14/19 even with pitch added, turning more than 7900. But this is a GTX Hull and they ran a smaller prop with similar mods to an RXP, which is what I ran.

  6. #6
    That sc is on par with an x..add 50 of fuel..and an exic...he should be all over the limiter..even in a 3seater.

    I got a smaller wheel...rear air instead of front...no extra fuel...no exic and can spin a 14/19 +2 to 7950-8000.

    Somethin's off.....and if he's havin probs hitting the limiter now...no way he'll hit 8500...even if his "riva ecu" would let him.
    Last edited by VaRedneck; 06-09-2013 at 10:17 PM.

  7. #7
    mikelytle1077's Avatar
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    i can smash the 8650 limiter out of the hole just to much prop i think the speed and power seem right 10lbs of boost and 71.6mph at 7850-7900 rpm i took 3mm pitch out of the prop i will test tomorrow anyone else running high rpms and what is your prop pitched to ? temps were 92 humidity was 80%

  8. #8
    monaroman76's Avatar
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    I think everything is fine, you just have too much pitch, you'll likely need to remove more than 3 mm.

  9. #9
    monaroman76's Avatar
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    I have 2 rude, riva ecu and a trued 15/22. It would only turn about 8150. Took a couple mm out to get rpm to 8340, still need to remove a few more mm. Not riding season down under, so I've been lazy.

  10. #10
    Quote Originally Posted by mikelytle1077 View Post
    i can smash the 8650 limiter out of the hole just to much prop i think the speed and power seem right 10lbs of boost and 71.6mph at 7850-7900 rpm i took 3mm pitch out of the prop i will test tomorrow anyone else running high rpms and what is your prop pitched to ? temps were 92 humidity was 80%
    No offense. I'd be curious why someone with a smaller wheel OEM fuel OEM intercooler can spin a 14/19+2 to [email protected] on a good day and 71.7 @8000 with full fuel and less than optimum conditions. I'm @ 800',fresh water. 185#. You see what I'm trying to say? You say you're all over the limiter at launch. But not afterward?..cavitating?

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