The turbo's actually what's responsible for the large increase, since I doubt they can run 105 octane lean enough to increase torque by 20% with stock air flow. The E85 helps of course, but if the engine was run with gas and a turbo, there would be a much more significant increase in torque (provided fueling was available) compared to the modest increase by being able to advance timing and run a bit leaner on E85. Course I'm not exactly sure how much greater than stoich you can run with higher octane fuels, so i could be totally wrong.
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
Ethanol does have a higher octane than gas, but the biggest reason for more torque and power is its heat of vaporization, which is higher than gas.
It takes more heat to vaporize a stoichiometric amount of ethanol than gas. Thus, the incoming air gets cooler. Cold air is more dense, meaning that a greater mass of air is drawn into the cylinders and thus more fuel can be burned. This increases the torque.
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