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  1. #1
    incognito's Avatar
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    Supercharger on 2015 FZS

    Question:supercharger on this ski is mechanically driven off crank
    by gears,if the engines RPM's is 7500,what is the turbo's impellar
    spinning at? (I.e.ratio between crank and supercharger impellar)


  2. #2
    HydroStream6's Avatar
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    9.86:1

  3. #3
    HydroStream6's Avatar
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    To answer your question, 7500rpm engine = ~74,000rpm blower

  4. #4
    incognito's Avatar
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    WoW!...no wonder they have clutch problems!,does the stock 2015 FZS have a BOV? And if so,what is
    blow off pressure?

  5. #5
    HydroStream6's Avatar
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    No

  6. #6
    That is why we recommend getting the add on BOV. Helps save the parts

  7. #7
    abracadabra's Avatar
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    Or does it??????

    It's possible that the free spinning of the clutch is what's wearing it out!!! There is absolutely less to none free spinning without a BOV, Julio...

  8. #8
    incognito's Avatar
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    Interesting,a mechanical driven turbo without a BOV/waste gate!what was yamaha
    thinking!...no wonder they have all these problems!...never heard of a supercharger
    Or turbo without some sort of dump for excessive over pressure,especially when you
    let off the throttle,looks like they use the "clutch" as some form of "waste gate/dump
    mechanism....IMPO,engine needs a factory dump valve!

  9. #9
    ptscon's Avatar
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    SeaDoo also uses a clutch so there must be a reason they went this route and it sure has to be a good one considering the issues these clutches face.

  10. #10
    HydroStream6's Avatar
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    The Sea-Doo clutch is a different type than ours. Also, the primary purpose of a bov is to reduce the stress on the turbine shaft. Air pressure back feeding due to a sudden closing of the throttle body tries to counteract the drive force and twists the shaft.

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