No, you don’t need E85 or anything to go over 600rwhp on a turbo LSX. At least you shouldn’t. But it’s basically free power so why not? Most turbo guys see around 10% more power on E85, it runs waaaaaaaaaay cooler (which I think would be a big benefit in this car), it basically doesn’t detonate but just stops making power if the tune is off, it keeps the motor cleaner, and it’s cheaper than 87 octane. Why the hell not use it? Like I said, just keep a 91 tune handy and then you’re fine.
-TJ
I wish it was readily available here…I would love to try it, but we only have three stations in the whole Pgh area that I know of and none are close to me.