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  1. #1
    Vern's Avatar
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    2004 Rotax Racing ECU rev limit & fueling?

    I have a friend with a 2004 RXP with a Rotax Racing ECU and 42 lb injectors, Green Wheel SC impeller, good rear air, etc. He has run this setup for a couple years, runs great, around 8450 - 8500 depending on air, and usually 80+ mph.

    I am less familiar with this ECU setup ... what is the rev limiter on this ECU? Am also thinking he might be lean with a stock X charger and this ECU and 42 lb injectors ... has anyone run this setup, or does he need a RRFPR to be safe?


  2. #2
    speedskixp's Avatar
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    Rev limit is 8550 but 8500 is perfect. We ran that set-up on a friends 04 for a short time before adding a wheel and spacer to the X and at that time added a rrfpr. Never checked A/f on the x-charger set-up but it seemed to run ok without issue. However, I dont need to tell you that it's always best to check to be safe, especialy if it will be run hard with alot of long wot runs.

  3. #3
    Vern's Avatar
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    Phew, good to hear. I do agree its always better to test, but I have no familiarity with that ECU and somewhat safe setups on 42s and stock FPR. We will prop for 8500 max, thanks!

  4. #4
    I have an 05 RXP. I ran 42's with the Rotax ecu, external intercooler, ported and decked head, racing cam, air intake, rotax +2 psi wheel (which is equivalent to the green wheel), etc. for a couple of years with no problems. That combo was recommended by Rotax Racing. It was fairly rich down low (smoke at idle) and, although I never checked afr's, Rotax considered them to be safe up top...probabally in the high 12's to low 13 ish area. If I Knew then what I know now I would definetly recommend checking your afr's and I would have added a rrfpr. With a stock head and cam you should be ok.

    Mark

  5. #5
    Vern's Avatar
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    Thanks Mark, appreciate the input!

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    dhoad's Avatar
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    Vern, in my experience with the rotax ECU he will be lean up top if he is adding an x charger and running 42s. I am sure 48s and RRFPR would make it safe

  7. #7
    Eric Ocman's Avatar
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    Quote Originally Posted by dhoad View Post
    Vern, in my experience with the rotax ECU he will be lean up top if he is adding an x charger and running 42s. I am sure 48s and RRFPR would make it safe
    Bosch 48s flow like mofos

  8. #8

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    it depends on which generation rotax ecu. I still have one of the original 04 ecu's. the rev limit on it is either 8450 or 8500 and it still uses the knock sensor. if he had the update done, than it went up to 8600 and they removed the knock sensor.

  9. #9
    dhoad's Avatar
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    Quote Originally Posted by seadoo1120 View Post
    it depends on which generation rotax ecu. I still have one of the original 04 ecu's. the rev limit on it is either 8450 or 8500 and it still uses the knock sensor. if he had the update done, than it went up to 8600 and they removed the knock sensor.
    Hmmm, that is news to me , interesting

  10. #10
    Vern's Avatar
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    Quote Originally Posted by seadoo1120 View Post
    it depends on which generation rotax ecu. I still have one of the original 04 ecu's. the rev limit on it is either 8450 or 8500 and it still uses the knock sensor. if he had the update done, than it went up to 8600 and they removed the knock sensor.
    It has been updated, was in a batch that Mark sent overseas for an update a few years back. Says no knock control on it.

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