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  1. #1
    Site Admin Green Hulk's Avatar
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    Very important info for those with X models

    Guys, everything we have learned in the past in regards to RPM was to pitch accordingly to run 8100 RPM's with the stock ECU.

    This is NOT the case for the X models. In fact, ideal RPM for these machines is no more than 8000 with the stock ECU.

    My sources informed me that the most power is made at 8000 RPM's. Any higher than that timing is reduced aggressively. There is also a hard rev limiter on the X models which is set at 8200.

    I just wanted to post this up as i know many of you with X models have been depitching to achieve 8100 RPM's.

    This only pertains to the X models and not the 08 215 HP versions.


  2. #2
    TERRY bigbuck12345's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Guys, everything we have learned in the past in regards to RPM was to pitch accordingly to run 8100 RPM's with the stock ECU.

    This is NOT the case for the X models. In fact, ideal RPM for these machines is no more than 8000 with the stock ECU.

    My sources informed me that the most power is made at 8000 RPM's. Any higher than that timing is reduced aggressively. There is also a hard rev limiter on the X models which is set at 8200.

    I just wanted to post this up as i know many of you with X models have been depitching to achieve 8100 RPM's.

    This only pertains to the X models and not the 08 215 HP versions.
    thanks jerry, i am running 7400 at 70.9 mph with the 15.5-22.5 right now will be looking for mor boost and power soon HAVE FUN IN VEGAS
    Last edited by bigbuck12345; 04-03-2008 at 12:38 PM.

  3. #3
    That's great news for those of you with X models currently running above 8K RPM. Means you have more speed left in them. Possibly another mph.

  4. #4
    Live to RIDE. brendus's Avatar
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    thats awesome info jerry thanks heaps.

  5. #5
    ROTAX RACING performance
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    i have that information also from the engine dyno.

    the power is in kw, 1 kw = 1.36 HP
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  6. #6
    REID2168's Avatar
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    looks as though the dyno confirms what Jerry was told! 8000 rpm is max power output with the STOCK ECU and any rpm above that decreases power! thanks for the information guys...helps us guys know to tune in those props for 8000 rpm after break! thanks again!

  7. #7
    EZ Dock of Long Island Shibby1485's Avatar
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    Quote Originally Posted by mrracing View Post
    i have that information also from the engine dyno.

    the power is in kw, 1 kw = 1.36 HP
    is that from a stock ski?

    243 HP out of the box at the crank... not bad at all not too far off from the advertised 255

  8. #8
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Guys, everything we have learned in the past in regards to RPM was to pitch accordingly to run 8100 RPM's with the stock ECU.

    This is NOT the case for the X models. In fact, ideal RPM for these machines is no more than 8000 with the stock ECU.

    My sources informed me that the most power is made at 8000 RPM's. Any higher than that timing is reduced aggressively. There is also a hard rev limiter on the X models which is set at 8200.

    I just wanted to post this up as i know many of you with X models have been depitching to achieve 8100 RPM's.

    This only pertains to the X models and not the 08 215 HP versions.
    thanks for the info Jerry.
    I was running 7,980 to 8,000 with stock prop. As per my thread i took out -1mm and ran 8,100. I am now running with -.5 on the stock prop and turnning 8,040 to 8,060 with avg of 70.5 mph low on fuel and that was with the wedge added. I think I loss over 1 mph with wedge.
    I guess i will put back .5 mm and try it at 8,000 rpm.

  9. #9
    ROTAX RACING performance
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    stock production engine

    Quote Originally Posted by Shibby1485 View Post
    is that from a stock ski?

    243 HP out of the box at the crank... not bad at all not too far off from the advertised 255

  10. #10

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    The 255 has power for more mph.... BUT, reducing drag and increasing hookup is hard to doo. I"ve danced all around the sweet spot.... hopefully I'll find it. From 1 extreme to another and missed the window somehow.

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