willingtowork Posted February 13, 2011 Share Posted February 13, 2011 I am wondering what should be the max boost pressure on a 2009 Mach Granite dump truck with a Mack MP8 485M engine. The one I drive will max out at around 32 psi. To me it seems low. What do you guys think. Any opinion would be appreciated. Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/17961-boost-pressure/ Share on other sites More sharing options...
rhasler Posted February 13, 2011 Share Posted February 13, 2011 The 2007 specs., which should cover your engine, say 30 psi at 1900 RPM. It can go higher than that. If you suspect a boost leak there's a good chance that it is on the "hot" side of the engine at the flange connecting the CAC pipe to the turbo or to the CAC. If you let the engine idle long enough to enter heat mode you may be able to hear a slight leak at one of these connections. The pipe is sealed at each end by an o-ring. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/17961-boost-pressure/#findComment-72770 Share on other sites More sharing options...
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