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Message: [QUOTE="TEXAS6.4, post: 878442, member: 13637"] correct, but in a compound turbo system your ratio of boost to drive pressure should be near 1:1. boost is great but excessive back pressure isnt, and i could see with a turbo as small as the vgt on a 6.4 it would be easy for the engine to be pushing more exhaust at it than its getting in return on the intake, nature of an engine designed for EGR who'da thunk it. cant believe theres not even a table in here for boost pressure have you changed your duration? do you see much loss of power with just a couple millisec? [/QUOTE]

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