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Originally Posted by escymkii
I was wondering n/a vehicles runs best at 80 percent load at around maybe 2000-2500 rpm. How about turbocharged gasoline engines? What if lets say at low RPM boost kicks in i believe entering into boost will require a rich mixture so will probably kill effeciency? so what is the "general rule" on these engines?
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Modern turbocharged engines do not differ that much from naturally aspirated engines. There is not that much need for rich mixtures anymore. VW's latest engine 1.5 TSI (EA211 Evo) doesn’t need rich mixture at all. It operates at stoichiometric conditions across the entire engine map. Ford’s 1.0 Ecoboost, which has been around for some time already, uses just a bit enrichment at highest load when revs are 3600 rpm or more. 1.0 Ecoboost actually goes slightly lean when pushed hard at low revs.
I don’t like general rules because there are so many different technologies on the market. Maybe one could say, that turbocharged engine have their most efficient point at slightly lower load point than n/a engines.