It is a given that you need to make the power you want to make without running into pre-ignition events first. I don't personally know if anyone has tried to make it to 600+rwhp with 93 on the stock VHR or not.
E85 increases knock resistance so you can run the proper ignition timing to achieve peak cylinder pressure at optimum crank angle. With 93 octane, you might find combustion to loose stability before reaching optimum ignition timing. Which, BTW, isnt the same for both fuels.
Last edited by phunk; 03-17-2014 at 02:58 PM.
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