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  1. #1
    rick xp's Avatar
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    Loss of boost on C-kit

    Hey Guys,

    I have just had my C-kit rebuilt and the slip set to 16 ft-lbs but i am currently only seeing 12 PSI at the manifold.

    I have pressure tested my entire system and have found and fixed a few tiny tiny leaks but i dont think it would make me lose 3 psi.

    Everything in the charger is set right but the only thing that may be causing it is the wheel has had a light touch down about 10mm in on the outer edge.

    Im turning a prop pretty close to a 15/24 to 8450 RPM with a 82mm reduction ring.

    I wouldnt of thought the very outer edge would have that much affect on peak boost?

    Get the wheel replaced?

    Any ideas?


  2. #2
    richrxp's Avatar
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    Get the wheel tightened to 40 nm and put some red loctite on the wheel,the bigger wheels tend to slip,due to the bigger power they make.

    Try this ,almost sure this is the problem you have.

  3. #3
    rick xp's Avatar
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    Thanks Rich,

    Yeah the wheel is tightend to 35NM with red loctite.

    Will test tomo and maybe increase it by 5NM and see what happens.

  4. #4

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    where you riding tomorrow might come down need to tune this 9100rpm ecu and then hopefully borrow your jd1 nozzle if thats ok(hopefully see 20-21 psi with this setup)

  5. #5
    richrxp's Avatar
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    Quote Originally Posted by rick xp View Post
    Thanks Rich,

    Yeah the wheel is tightend to 35NM with red loctite.

    Will test tomo and maybe increase it by 5NM and see what happens.
    Really hopes this helps,but 35 nm and red loctite normally must do the job.
    But you never know,maybe the 5nm helps.

  6. #6
    richrxp's Avatar
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    Quote Originally Posted by rick xp View Post
    Thanks Rich,

    Yeah the wheel is tightend to 35NM with red loctite.

    Will test tomo and maybe increase it by 5NM and see what happens.
    Did you put the loctite on the shaft also?
    This way you lock the shaft on the impeller.

  7. #7
    2006 Turbo RXP boBO's Avatar
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    Quote Originally Posted by richrxp View Post
    Did you put the loctite on the shaft also?
    This way you lock the shaft on the impeller.

    +1

  8. #8
    ROTAX RACING performance
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    Quote Originally Posted by rick xp View Post
    Thanks Rich,

    Yeah the wheel is tightend to 35NM with red loctite.

    Will test tomo and maybe increase it by 5NM and see what happens.

    leave the SC alone, you have a boost leak , airbox IC , piping , IC blockoff, etc

  9. #9
    Moderator Snoman's Avatar
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    Quote Originally Posted by mrracing View Post
    leave the SC alone
    +1....

    Quote Originally Posted by richrxp View Post
    Get the wheel tightened to 40 nm and put some red loctite on the wheel,the bigger wheels tend to slip,due to the bigger power they make.

    Try this ,almost sure this is the problem you have.
    192 inch LBS is more than enough slip to have on a C-kit SCer..You do NOT need to make the slip higher..Im Running My 2 rude at 180 inch Lbs and she is running perfect..So your slip,IMO is fine..

  10. #10
    rick xp's Avatar
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    Yeah i found some really tiny leaks coming out of the adjustment screws on my regulator and bov.

    Guys i would def check these if you are running these as they are only sealed by an oring but they can still leak out the M6 thread.

    I just put some thread tape around the thread and tested again and no leak.

    I pressurised the system to 17 PSI and sorted these tiny leaks but i just dont see a 3 PSI drop.

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