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Less than a 1:1 exhaust/intake pressure possible?

Discussion in 'Turbo Tech Questions' started by KooK, Jun 13, 2013.

  1. KooK

    Joined:
    Sep 10, 2003
    I was talking with a man who claims that in the 80s, some Indy cars were using a setup that would allow them, "with the use of heat," to be able to achieve more intake pressure than exhaust back pressure. I'm finding this very hard to believe and wondered if anybody here had ever heard of this? I wouldn't believe that even a 1:1 would be possible. You can get close but, beyond atmospheric pressures, it doesn't seem logical to me.
     
    KooK, Jun 13, 2013
    #1

  2. MONTEGOD7SS

    Joined:
    Jul 29, 2009
    It's very possible. You have to think about the turbine diameter and leverage, not just pressure. Big turbo turbo Buicks are under 1:1 all the time. Your downpipe will also affect the pre-turbine pressure, because any pressure there will be added upstream.
     
    MONTEGOD7SS, Jun 13, 2013
    #2

  3. PrecisionTurboMustang

    Joined:
    Jan 27, 2006
    Doesn't happen often but has been discussed here from time to time.
     
    PrecisionTurboMustang, Jun 13, 2013
    #3

  4. jridenour31

    Joined:
    Sep 3, 2009
    Very possible, just need a large enough turbine and downpipe.
     
    jridenour31, Jun 13, 2013
    #4
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