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Blowing exhaust and back pressure

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MartinV8:
A normally aspirated engine relies on a tuned exhaust length & bore combination for optimum performance as the momentum of the exhaust gases in the exhaust will suck the burnt mixture through the exhaust port rather than absorbing engine power by pushing them out. On a turbo engine the less back pressure the better as previously stated. This lets the turbo spin much more easily and hence more ponies. The power absorbed by the engine pushing the gases out of the cylinder is neglible when compared to the huge benefit of the turbo spinning nice and freely. This is why you see all the jap turbo cars with big bore exhausts.
Remember seeing a 90 in one of the mags, think it was French and called Xtreme, it had a small stubby pipe exiting behind front wheel with no silencers. Ran big boost and went like the brown stuff off a shovel!


Martin

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