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Cummins 855 boost pressure
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coastalBend
Posted 2/4/2025 09:34 (#11088584)
Subject: Cummins 855 boost pressure


south texas
Still fighting my high egt. Reading online forums some have suggested that boost pressure should be 28 - 32 psi. I'm gonna pressure test my air system and see if there is any leaks but for this discussion, let's say there is no leaks.

Under full load I'm getting 12 psi at the intake manifold. Turbo was sent in last rebuild. Let's says 1500 hrs ago. No oil leaks. Egt is running 900 post turbo.


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