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International Automotive Technicians Network
Re: What is acceptable Back Pressure?
Posted to Technical Discussion Forum on 11/23/2009 21 Replies



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Depends on the car and the conditions at the time of inspection however as a rule of thumb:

2500RPM no load about 1.5 PSI max WOT under heavy load about 7-9PSI Max.

Turbocharged m... Login to read more.

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