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  1. #1
    HardmanGT's Avatar
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    spinning a Riva XX Charger at 9200, what boost pressure, what issues?

    I have a XX charger on my ski now and am getting ready to run 9200 RPM. I wanted to find out how the supercharger will behave and contacted Vortech and they were zero help. All they said was that it would be "fine" to do so. They didn't respond to questions about boost pressure or extra heat generated at those speeds. Does anyone have any experience with running a XX to 9200 RPM?

    Keep in mind that I am aware that there are other options for superchargers/turbos at this level but this is what I have for the time being.


  2. #2
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    I can almost guarantee you it will be outside its efficiency zone... (But willing to be told otherwise)
    Most chargers are 'designed' to operate efficiently at 7800-8200... Thats assuming the guys designing the cut are aerospace engineers.

    I can get you a billet wheel made up thats blue printed and designed to be most efficient (Read: Least heat generated vs cfm) at 8950-9200 with solid CFM @ psi figures to work off, but it may take up to 4 weeks for it to be slotted into the production line as its a '1 off'.

    The problem with most companies that sell wheels is the lack of data that they provide... "15 psi @ 8500" doesn't mean shit if its 170 degrees @ 15 psi.

    The other problem that some billet wheels/cuts on the market have are blade flexing issues @ higher rpm which can lead to inefficiency, touch downs and dramatic failures.

    I'd push them for more information... Ask to speak to the impeller designer

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  4. #3
    i hate my bipolar disorder its great
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    just means its going to det easier take less timing and more fuel to keep it alive... and make ass loads less power...

    id imagine they would start to fall of the edge after 8600rpm... but only real way tell would be inlet air temp sensors and egt sensors... i guess

  5. #4
    HardmanGT's Avatar
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    I had been suspecting that the XX would be a poor choice at those speeds. I just needed some input. XX is for sale in the classifieds

    http://www.greenhulk.net/forums/show...29#post2040929

  6. #5
    GRF + DashPac:) seadoo02xp's Avatar
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    My xx was building good boost all the way to 8700, but i wanted more low end power so i went to the xxx, you will be happier with the xxx IMO after running them both

  7. #6
    Eric Ocman's Avatar
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    Re: spinning a Riva XX Charger at 9200, what boost pressure, what issues?

    Scs build boost based on rpm so.... As long as you have a good ic you should be fine. They just need rebuilt more often imo.

  8. #7
    The most interesting man in the world. Nils888's Avatar
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    The most interesting man in the world. Nils888's Avatar
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    Quote Originally Posted by HardmanGT View Post
    I have a XX charger on my ski now and am getting ready to run 9200 RPM. I wanted to find out how the supercharger will behave and contacted Vortech and they were zero help. All they said was that it would be "fine" to do so. They didn't respond to questions about boost pressure or extra heat generated at those speeds. Does anyone have any experience with running a XX to 9200 RPM?

    Keep in mind that I am aware that there are other options for superchargers/turbos at this level but this is what I have for the time being.
    The guys at Vorteh are rite. 9200 will not be a problem

  10. #9
    HardmanGT's Avatar
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    Quote Originally Posted by Nils888 View Post
    The guys at Vorteh are rite. 9200 will not be a problem
    So anything more to add? Boost, excess heat?

  11. #10
    The most interesting man in the world. Nils888's Avatar
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    Quote Originally Posted by HardmanGT View Post
    Quote Originally Posted by Nils888 View Post
    The guys at Vorteh are rite. 9200 will not be a problem
    So anything more to add? Boost, excess heat?
    A 137mm vortech impeller is not going to have heat issues. Boost around 16 lbs.

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