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Hmmm,
With direct fuel injection, then a turbo on a gasoline engine just compresses air.
Do turbo diesels use ever use an intercooler? (If the main purpose of increasing compression on a diesel is to heat things up...)
On a turbo gasoline engine, an intercooler can improve power (and probably boost FE) by increasing compression but avoiding pre-detonation because the heating (from compression) is reduced?
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