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  1. #1
    RXP rider's Avatar
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    I only see 69 why ? And SC slip

    Hi

    I was back om the water after a SC rebuilt and a lot of other stuff I add over the winter.
    I was only running 69 mph and 8160 rpm ( after the speedo ) this winter I put in a Rotax Racing 127 mm wheel that was suppost to put out 9,5 psi @ 8500 rpm. And a new 15/22 untouched solas.

    Last year I was running 68,9 with stock SC and a 14/19 solas. thats why it doesn´t make sens it is that slow ?

    Seaond question :

    When I rebuilted the SC with new rebuilt kit and the 127 mm Rotax Racing wheel I set the slip at 11,8 NM The manual suggested 10 to 12 NM. Do I need to set the slip a little higer when I run that wheel ?

    My setup is:

    Rotax Racing SC wheel
    front 4¨ intake
    free flow exhoust
    Rotax Racing ECU ( 8300 rpm limiter )
    42¨ injectores
    XS intercooler
    Riva valve train
    15/22 solas
    SS wear ring
    Worx intake grate

    I appreciate any help
    Last edited by RXP rider; 04-19-2011 at 05:10 PM.


  2. #2
    R88ory RXP's Avatar
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    Quote Originally Posted by RXP rider View Post
    Hi

    I was back om the water after a SC rebuilt and a lot of other stuff I add over the winter.
    I was only running 69 mph and 8160 rpm ( after the speedo ) this winter I put in a Rotax Racing 127 mm wheel that was suppost to put out 9,5 psi @ 8500 rpm. And a new 15/22 untouched solas.

    Last year I was running 68,9 with stock SC and a 14/19 solas. thats why it doesn´t make sens it is that slow ?

    Seaond question :

    When I rebuilted the SC with new rebuilt kit and the 127 mm Rotax Racing wheel I set the slip at 11,8 NM The manual suggested 10 to 12 NM. Do I need to set the slip a little higer when I run that wheel ?

    My setup is:

    Rotax Racing SC wheel
    front 4¨ intake
    free flow exhoust
    Rotax Racing ECU ( 8300 rpm limiter )
    42¨ injectores
    XS intercooler
    Riva valve train
    15/22 solas
    SS wear ring


    I appreciate any help
    I would think you want your slip 10-12ft,lb. Not Nm.

    I take it your using GPS to measure your speed.

    Unfourtunatly the speed doesn't come from just bolting things on, you have to make all the parts of the setup work together.

    R88

  3. #3
    Matatan tocullo's Avatar
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    Are you using a gps?

  4. #4
    Moderator Snoman's Avatar
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    Quote Originally Posted by tocullo View Post
    Are you using a gps?
    +1...Are you measuring your speed off the speedometer??Or are you using a GPS??If your using the speedometer then you will never see anything above 69 on it,no matter how fast your going..

  5. #5
    Check with GPS, 06 speedos were known to go to 69 and thats it no matter how fast the paddle wheel was spun.

  6. #6
    mrbtd's Avatar
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    Not making enough power to turn that 15/22 is my guess

    Sent from my Desire HD using Tapatalk

  7. #7
    Moderator Snoman's Avatar
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    Quote Originally Posted by mrbtd View Post
    Not making enough power to turn that 15/22 is my guess

    Sent from my Desire HD using Tapatalk
    You might be right Bill, But even with that prop,all his mods and the ECU he should still see speeds above 69 IMO....

  8. #8
    RXP rider's Avatar
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    year snoman that was my thought too. Today I will tweak the prop to get the last 140 rpm. The speed was measuret with the speedo so it the speedo stops at 69 I see why Tomorrow I will do a test run with the repitched prop with my gps. What speed do you think I will se on the GPS ?

  9. #9
    RXP rider's Avatar
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    btw I saw 8160 rpm should I let it be there or will I have it at 8300 like my rpm limiter ?

  10. #10
    Got Boost? psycho rxp's Avatar
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    The factory speedometer stops @ 70, no matter how fast you go. Use a GPS for all speed runs.

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