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  1. #1

    xs intercooler no gain

    Hello,
    I have a RXT 07 with the following modifications.

    RR wheel
    XS intercooler ( this year 2009 )
    14/19R + 1mm
    OPAS block off
    Riva intake grade.

    I'am running 68.5 mph and 8170 rpm. Is this normal.

    My friend is running the same modifications but not a XS. He is running 68 mph and 8170 rpm.

    Is this normal. I have no gain mith the XS intercooler

    Thanks
    Mike


  2. #2
    Water4fire's Avatar
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    Mike you are most probably hitting the rev. limiter. I would add pitch or try a 15-20 solas prop.

    also what intake you running?

    .

  3. #3

  4. #4
    Dave Sharp dav_dman's Avatar
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    also you are probably running 50deg cooler intake air...worthwhile in itself, imo.

  5. #5
    Yea, looking at this again I agree with Austin. Try a 15/20R prop.

    But I'm still thinking a small boost leak somewhere too. Check the IC blockoff and seal it with silicone if you didn't already. Check your couplers. Did you spray the inside of the couplers with Windex or some other glass cleaner? Helps them go on easier and creates a better seal.

  6. #6
    ROTAX RACING performance
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    you need more fuel !!!

  7. #7
    I have no boost leak.

    Is 8170 rpm on de limiter ?

    Now i put 2mm on my prop.

    Tomorow i'am testing.

  8. #8
    Quote Originally Posted by mmvane2 View Post
    I have no boost leak.
    How do you know? What's your boost gauge telling you?

    Also, what size injectors are you running? 42# or a RRFPR?

  9. #9
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by mmvane2 View Post
    Hello,
    I have a RXT 07 with the following modifications.

    RR wheel
    XS intercooler ( this year 2009 )
    14/19R + 1mm
    OPAS block off
    Riva intake grade.

    I'am running 68.5 mph and 8170 rpm. Is this normal.

    My friend is running the same modifications but not a XS. He is running 68 mph and 8170 rpm.

    Is this normal. I have no gain mith the XS intercooler

    Thanks

    Mike

    If your prop is the same pitch as before the XS mod then your going to run the same speed. You need more pitch when you add more power.
    NOt sure why everyone thinks that just adding power will go faster without repitching prop.

    MMVANE2, that was not intended at you but to all that are new to adding power to these skis.

  10. #10
    Quote Originally Posted by RXP-REX View Post
    How do you know? What's your boost gauge telling you?

    Also, what size injectors are you running? 42# or a RRFPR?
    My rxt hard pull to 8170 rpm.

    I have 10.5 psi boost.

    Is this a soft limiter ?

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