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12-30-2010, 10:52 PM
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|   Neutral : +1 score  I think ethanol does have some benefits even without any tuning. Whether these power advantages are measurable in practice, I guess is a different question... 1. Ethanol has less energy than gas does per volume, but when mixed at a stoich ratio the ethanol mixture is going to release more energy by about 5% over gasoline. 2. Ethanol generates lower exhaust gas temperatures as compared to gas, and also increases the total exhaust volume, which can be particularly beneficial for turbos. 3. Ethanol's evaporative cooling advantage is only amplified by the high-pressure DI system, which can cool the air charge and ultimately increase VE. 4. Ethanol burns much more efficiently (faster) at richer mixtures than gas does. 5. Ethanol's initial burn time is much slower than gasoline which reduces the amount of negative work done on the piston at the end of the compression stroke. And I think what Driver is doing is bad ass. |
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