Quote:
Originally Posted by ChazInMT
Yeah, it is true. There is power required to spin the turbo charger, that has to come from the engine. People always think it's just "Waste Gas", but it isn't. There is a load placed on the engine to make the turbo charger spin, if you just let the air blow into the open by not hooking it up to your engines air induction, it would really slow you down. But since it is packing in a lot of air into your engine, the net gain is that it does help, you're MPG increase is due to the turbo allowing you to operate in a better region of the BSFC chart for your engine. This is basic turbo charger stuff.
You don't get something for nothing, but the benefits outweigh the losses in this case. It is understandable for you to think as you do, but it is not accurate.
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No its not true. If you pack more air into the cylinder it and supply the same amount of fuel the resultant combustion gases are cooler because of the excess air. The end result is less heat energy lost to the cooling system and more energy in the combustion gases that can be extracted by the piston. Also a turbo that is properly matched at a load point and rpm will generate more pressure in the intake manifold than in the exhaust manifold.