Overspool hx35?
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In a twin turbo set each turbo is considered a stage of compression. The low pressure turbo will compress the air from atmospheric pressure to 20lbs or so(pulling numbers out of the air here) That is a 2.3 Pressure ratio. If the High pressure turbo compresses that to 40lbs it would only be a 2 pressure ratio. The overall boost pressure is greater but the pressure ratio the turbo sees is much lower.
Pressure ratio is the ratio of boost pressure from after the turbo to before the turbo expressed in atmospheric psi.
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BIG SOCHA
24 Valve 2nd Gen Dodge Cummins 98.5-02
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10-23-2014 11:01 PM