Forum Discussion

lfeather's avatar
lfeather
Explorer
Aug 27, 2015

7-14 psi turbo boost when engine compression brake engaged

With, as always, zero torque and 256 mpg as shown on silverleaf. Anyone have any ideas why this would occur? I wouldn't think that turboboost should activate with engine compression brake engaged? TIA
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wolfe10's avatar
wolfe10
Explorer
Aug 27, 2015
I would suggest that the correct word is that an exhaust brake RESTRICTS exhaust flow. They all have a limit on how much back pressure the engine manufacturer allows. An engine is a LARGE air compressor. Even 55 PSI of back pressure (one of the standard limits) does not completely cut off exhaust flow.

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