08-22-2008, 11:45 AM
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#11
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Registered Member
Join Date: Apr 2008
Posts: 6,624
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Quote:
Originally Posted by Hal9000
But even when a turbo isn't spooled up (like when cruising on the highway for example) it's still idling so to speak. When this is happening, the turbo only produces a small amount of pressure. That won't affect performance substantially, but what it does do is alleviate the need to the engine to suck air into the engine on it's own (like a vacuum pump). The turbo pushes the air in instead. This can make a difference in the VE and FE of the engine.
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I don't understand how this could help FE. The energy isn't free; it's not recovered waste energy, the engine has to push the exhaust out to turn the turbo, right?
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