Quote:
Originally Posted by Railgun
The pressure on the internals is exactly the same. 20 psi is 20 psi. Air temp and exhaust flow will change, improving breathing and probably increasing fuel (higher air density) but there is no reduction in internal stress.
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Sort of.
Remember, boost is a measure of restriction. 20 psi is NOT 20 psi, in that with a ported head, high flow exhaust, you've decreased restriction thus you'll run more power at the same boost level -this is reflected in higher wgdc; it's not magic, you're simply moving more air. For example in the N54 world, our GC exhaust manifolds outflow stock by a significant margin, we end up making the same power as stock frame designs with a couple of pounds less boost. Less restriction.
Remember, an engine is just an air pump.
All else equal though, removing restrictions is free power.
Chris