Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

Boost PSI inquiry

Old 03-05-2019, 02:58 PM
Mmgg44's Avatar
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Default Boost PSI inquiry

I have recently installed a boost gage. I am wondering the psi that i have been seeing is normal/ok. When i am traveling around 70mph i am showing a concestant level around 12psi. When i am accelerating anywhere from 12-14psi i would say is about avarage. I have seen it spike to 15 a few times and 16 once when climing a steep hill at 70mph.
Old 03-05-2019, 05:10 PM
Bigg Redd's Avatar
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12 - 14 psi sounds about right for accelerating or pulling heavy loads, But you don't wanna see more than 15-16 psi for too long, and keep EGT's below 1100 degrees. That's when **** blown head gasket(s) resulting over heating and cracked head(s), a broken crankshaft etc... Concern yourself with EGT's more than boost pressures with that rig. Do you have a pyrometer gauge? If not, get one. Its cheap insurance.

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