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Old 10-23-2012, 11:25 AM   #4 (permalink)
RobertISaar
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Join Date: Jul 2012
Location: camden, MI
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MC SBX - '95 Chevrolet Monte Carlo LS
Last 3: 29.75 mpg (US)
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Quote:
Originally Posted by MetroMPG View Post
turbocharging's efficiency gains mostly come from downsizing the engine so that peak power demands are provided by the turbo, while light/moderate loads are handled off-boost by the otherwise smaller engine. (Similar to the approach of hybridization.)
this is correct and where a large part of the gains come from.

another potential gain is that with an identical engine with a turbo, you can run along with a numerically lower FDR to drop cruise RPM and lower vacuum losses.
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