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  1. #1
    MRO's Avatar
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    New Rotax Supercharger Impeller with Spacer?

    Is there any information on this new wheel with housing spacer? Has anyone run it yet? Any idea on cost? I know there was some talk about it a while ago, but there were no real specs out for it at that time.

    I am debating this wheel over the Riva Stage 3 wheel and wanted to know if it could be run with 42lb. inj. and stock ecu.

    Thanks
    -Matt


  2. #2
    Site Admin Green Hulk's Avatar
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    It's going to be $595 and we are not sure about fuel requirements as no testing has been done on stock ECU's. Im confident that it will work well with 42's as i don't expect it to perform as well as the Riva stage 3 SC which we already know to work well with the 42's and stock ECU.

    I only say the S3 SC will out perform it because the new Rotax wheel only makes 12.7 psi at 8700 RPM's. That's alot of RPM's to make such little boost

  3. #3
    ROTAX RACING performance
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    I have the new SC with spacer , and will test the boost at 8100, RPM and 8500 ROTAX RACING ECU.

    I will keep you updated next week

  4. #4
    MRO's Avatar
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    Thanks for the fast replies, all!

    Jerry - do you know when these will be in stock?


    mrracing - Thanks in advance for letting us know your boost results.


    -Matt

  5. #5
    Site Admin Green Hulk's Avatar
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    Malte, i look forward to those results.

    MRO last i heard it was 2 more weeks. That was 2 weeks ago

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    riva claims 10.4psi @ 8400
    RR claims [email protected] 8700

    do you think riva will put out another 1.4 psi from 300 rpms?
    or the inverse, do you think the RR will lose more than 1.4 by running at 8400 instead of 8700

    we know the ratio of engine RPMs to supercharger rpms, but does anyone know the proportions of SC rpms to boost pressure?

  7. #7
    Site Admin Green Hulk's Avatar
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    those proportions are going to vary according to impeller design. the only sure way to know is on the water testing with a good accurate digital boost gauge.

  8. #8

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    Quote Originally Posted by Green Hulk View Post
    It's going to be $595 and we are not sure about fuel requirements as no testing has been done on stock ECU's. Im confident that it will work well with 42's as i don't expect it to perform as well as the Riva stage 3 SC which we already know to work well with the 42's and stock ECU.

    I only say the S3 SC will out perform it because the new Rotax wheel only makes 12.7 psi at 8700 RPM's. That's alot of RPM's to make such little boost
    jerry how can a ski run 8700rpms ?

  9. #9
    Site Admin Green Hulk's Avatar
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    With a Rotax Racing EMS system. You ready for one?
    http://www.4-tecperformance.com/inde...roducts_id=285

  10. #10
    Matthew K ReDevilRXP's Avatar
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    So is this one that much better then the old one considering theres olny a 50 dollar price difference after they jacked the price of the current one ? Or are they gona lower the price of the current one ?

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