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Thread: speed problem

  1. #1
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    speed problem

    hi guys,

    i moded an gtx 215hp and a rxt '06
    1problem: i dont get my skis over 70mp/h!!!

    i have the folowing setup:
    -stronger valve springs
    -riva compressor
    -riva injectors 50lb
    - franco's racing ecu
    -franco's intercooler
    -racing waterbox
    -large air intake
    -r&d intake
    -riva 3blade prop 15/19
    -steel clutch-washers
    -wedge
    ...


    the skis running 8300/rpm and 70mp/h and i dont get it over that 70...
    any suggestions to get them over that 70mp/h?

    kind regards!


  2. #2
    tick.. tick.. RXPteamtimebomb's Avatar
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    what are you using to measure your speed? if you are going by your speedometer on your ski its probably wrong... you may be going over 70, they don't read more than 70mph... if you are using GPS, sorry...have no idea

  3. #3
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    70mp/h on gps!

  4. #4
    tick.. tick.. RXPteamtimebomb's Avatar
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    sorry... someone will chime in and give ya some pointers im sure

  5. #5
    Gotta love this sport! 05Limited's Avatar
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    Quote Originally Posted by blackpearl View Post
    ... the skis running 8300/rpm and 70mp/h and i dont get it over that 70...
    Are you seeing this 70mph on the stock speedometer?
    The stock speedo rarely reads over 70 mph.

    With those mods you are definately going faster than 70

    Jeff


    Oops... I wasn't fast enough... just saw that you saw this speed on GPS

    ... man, I'm stumped
    Last edited by 05Limited; 02-19-2007 at 04:28 PM.

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    do you have a fuel controller?

    straight up Franko Rotax Racing ECU with 50lb injectors?

    Which Riva compressor?

    do you have a boost gauge? how many psi of boost?

    you could be running pig freaken rich (ask bttek)... could have a boost leak...

  7. #7
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    i dont run a fuelcontroller.
    just the 50lb's and the rotax racing ecu.

    I use the rive pro-series sd charger.

    I have 10.2psi boost on my gauge at 8250-8300 rpm.

    And i already checked for boostleaking!

    bp.

  8. #8
    shhr's Avatar
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    does it spin the prop out of the water ? check wear ring

    also are you running a catch can? remove one of the pipes to the intercooler and check for clogging

    you need a fuel controller does it run rough at take off or at WOT

  9. #9
    Quote Originally Posted by blackpearl View Post
    i dont run a fuelcontroller.
    just the 50lb's and the rotax racing ecu.

    I use the rive pro-series sd charger.

    I have 10.2psi boost on my gauge at 8250-8300 rpm.

    And i already checked for boostleaking!

    bp.
    if u got the rr ecu & a riva s3 s/c u should b running 42 lb injectors u don't need the fuel controller unless u have the b-kit then u need the 50 lb injectors
    which rr ecu do u have the stock class it should b running 8400-8450 rpm
    or the 8600 rpm which u should b turning 8500 rpm u might need 2 repitch ur prop 2 get ur r's up
    check ur wear ring & get rhe riva intake grate 1 mph over r&d
    do u have the same mods on both skis
    Last edited by yellow jacket; 02-19-2007 at 07:46 PM.

  10. #10
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    should give the 50lb's together with the franco rr ecu the problem? riva rr ecu better?

    i just checked my sparkplugs and the color is realy fine!
    I think when i am running the 42lb's, i dont get enough fuel!!!


    the wear-ring and prop are fine and brand new!
    i dont spin it out.

    the both ski's have the same setup.

    I tried also the 15/20 4-blade prop and than i run 8000/rpm max!!!

    regards!

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