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Old 10-06-2021, 01:29 AM   #224 (permalink)
Isaac Zachary
High Altitude Hybrid
 
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,075

Avalon - '13 Toyota Avalon HV
90 day: 40.45 mpg (US)

Prius - '06 Toyota Prius
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Quote:
Originally Posted by oil pan 4 View Post
Not really, gasoline engines require a richer fuel ratio and have a higher brake specific horsepower consumption.
When the gasoline engine is running under vacuum the turbo system is just dead weight.
Of course a gasoline engine could be tuned and designed to be more diesel-like. It could be made to run much leaner, have direct injection, and if sized correctly could run most of the time at full throttle making the turbo useful. If ran lean enough the engine will actually run cooler.

But things get even better with gaseous fuels like propane, natural gas and hydrogen. These can run much leaner, (30:1 for propane IIRC and even leaner for hydrogen) and practically not even need a throttle valve. Just enrich the AFR for more power, like in a diesel.
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