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Old 09-06-2016, 12:06 AM   #6 (permalink)
ConnClark's Avatar
Join Date: Jun 2008
Location: Richland,WA
Posts: 967

Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

Gentoo320 - '04 Mercedes C320 4Matic
90 day: 22.44 mpg (US)
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Diesels run more efficiently under boost. The higher air mass in the engine absorbs more combustion heat and thus keeps it from being absorbed by the cylinder and combustion chamber. The extra heat energy absorbed by the air can then be extracted in the power stroke.

Keep in mind that the benefit from this is a diminishing return and beyond a certain point frictional bearing losses from the increased pressure will overwhelm any gains.
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