Quote:
Originally Posted by LostCause
Also, I don't understand why a turbocharger doesn't decrease pumping losses, at least on the intake stroke. If the intake manifold is above ambient, doesn't that mean the absence of pumping losses?
- LostCause
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Because gasoline engines are throttled to limit power when low power is desired. The manifold is still under vacuum up until 100% volumentric efficiency (its probably 85% because most NA engines cant fill thier cylinders 100%) so there is still pumping losses.
I write this under the assumption we are comparing the same engine pre and post turbo.