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Old February 5th, 2017, 14:44   #9
bhtooefr
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The way I'd say to go is... size the base engine for naturally aspirated normal driving (not just naturally aspirated cruise), and sell the base model naturally aspirated. That means, in a Golf-class vehicle, somewhere around 1.8-2.0 liters is about right. And, you can use variable Atkinsonization (as VW is playing with on some engines now) to reduce pumping losses at light load, too.

Then, if you want to create a high-performance model, turbocharging that is OK - drive the high-performance model normally, and it'll do well - better than a large displacement engine. Drive it aggressively, and the mileage goes to crap, quite possibly worse than the large displacement engine, but truly aggressive driving isn't that common, and you can get away with it. (That said, with variable Atkinsonization, cylinder deactivation, and long gearing, the large displacement engine can get surprisingly good mileage when driven normally, too, and then you have higher reliability than the turbo engines.)

Aggressive downsizing to a 1.4T or smaller, OTOH, means everything's aggressive driving in a Golf.
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