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Message: [QUOTE="Charles, post: 271154, member: 103"] Some people do in fact look to backpressure as if the cast manifold, held to the head with two bolts per cylinder is stronger than the cylinder itself, and that the exhaust system actually held fast while the poor headgasket with 6 fasteners per cylinder and wire backup let go, lol. The only correlation I could venture would be that higher drive pressure is going to increase exhaust gas reversion, increasing the in-cylinder temperature at SOI, and possibly reduce combustion delay enough to cause a meaningful change to the start of combustion. Although I don't feel strongly that it would usually produce enough of a change for practical concern in any usual setup, but, I've never sat and tested it either. As far as ideal.... none? Operating sub 1:1 is the sweet spot. Engines start getting very happy and willing to make power when drive drops below boost. [/QUOTE]

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