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  1. #1

    VXR 2012 locked at 7680rpm , help !

    hi !

    i so despair

    i have a 2012 VXR with lot of MODS and i have a problem !
    My max top speed is 70mph and my max RPM is 7680 ( alway 7680 with my ECU R3 ) ?
    Stock prop = 7680rpm
    Skat trak 12/18 = 7680rpm

    WTF ? the prop pitch is the problem ? the diameter of nozzle ? or other ?

    I did check the R3 whit Jerry ( green hulk ) and everything is OK ( invoice for him last month ) last week i received my R3 ( audited ) and the result is the same , 7680rpm ...

    i have a very good low and middle range ( no cavitation or rebounce ) , incredible accelerate , but my rpm is locked to 7680

    how did you solved this problem ?

    i go crazy ...

    this is my setup : `
    2012 VXR 70 mph (GPS)│R&D Reflash R3│RIVA free flow exhaustRiva Ribbon DeleteStock Ride Plate│Riva grate│No stock spacers│BMC air filter12/18 Skat Trak / R&D anti-cavitation cone / R&D sponsons

    big thanks my friends !

    best regards

    yoann


  2. #2
    LugNutLS1's Avatar
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    I assume you are reading RPM on a TTO/tiny tach correct?

  3. #3
    this is my tachometer :
    http://www.ebay.com/itm/181417983118?item=181417983118&viewitem=&sspagenam e=ADME:L:OU:FR:3160&vxp=mtr
    • Brand new
    • Easy to install
    • Maximum RPM Recall Function
    • LCD digital display (5 Digit Display)
    • Show both engine RPM and hours of operation
    • Reads up to 30,000 RPM & 99,999 Hours
    • Eliminates guessing for the oil change intervals
    • No power connection required (internal batter CR2430)
    Common Applications: 2/4 Stroke Engines, RC Toys, PWC, ATV, Motorcycles, Marine Engines, Chain Saws, Tractors, Lawnmowers, and gas powered tools

  4. #4
    i check all parts on my VRX , spark plug , oil level , gaz tiger , baby pump , exhaust , air filter ... and the result is always the same 6780rpm .

    but one day i jump a big wave with trigger gaz at full and my tachometer register 8120rpm

    sorry for my very bad english ...

  5. #5
    LugNutLS1's Avatar
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    Have you checked compression? Getting right amount of fuel (AFR gauge)? Throttle body opening completely? Something is obviously limiting revs

  6. #6
    the compression is OK !

    for the AFR gauge , i dont know ... how tow check ?

    and for the throttle body this is a capture of my sensor ( at full or not ) :







    how tow check if the throttle body opening completely ?

  7. #7
    LugNutLS1's Avatar
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    Pull intake boot off and look at the blade.

  8. #8
    AWA MEMBER
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    http://www.greenhulk.net/forums/show...rop+suggestion



    seems to me the Vtech gets better results

  9. #9
    AWA MEMBER
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    or maybe try a 13/16

  10. #10
    Quote Originally Posted by LugNutLS1 View Post
    Pull intake boot off and look at the blade.
    sorry i don't understand

    i pull intake boot off and look the blade whit motor ON ?

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