Quote:
Originally Posted by turboguy327
Im aware they are in use in europe. But how can you say its the high compression and diesel that gives the great fuel economy on my truck yet a ford under the same conditions gets 9 mpg?? And the turbo doesnt matter?? Because without the turbo the truck would barely be able to move. The turbo makes it more efficient. The turbo went out on my old truck my milage went down to 6 or 7. New turbo and back up to 22 just like it was before the turbo went.
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I didn't say that...but I can see his point...turbos/superchargers only add more air. They don't inherently make an engine more efficient...it's up to the tuning from the factory and many other variables of the engine's design to take advantage of that air.
And the massive energy-density of deisel fuel gives it a clear advantage because you don't need to use as much volume of fuel to release the same amount of heat as gasoline.
The example you gave about your truck losing fuel economy when the turbo broke is a direct result of that engine being designed with the amount of air a turbocharger can provide. So...depending on how you're looking at the operation of an engine...you're both right, imo.