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You wont need 110 to make that sort of power on 25psi, its a waste of money and you will actually lose power. If you can find E85 near you and you can drop in bigger injectors, do it.

 

Won't need leaded fuel either.

 

There is one E85 station within 100-125 miles of me. I'd hate to get caught out without a way to refuel. That's why I thought if I go for a tune on 93 (for daily use), then when I want to go to the track I just plan ahead & let the car run low on fuel, I could just refuel with 110 (a few local stations sell this), switch maps & go. You really don't think I'll need to run 110? The car is a IX & I'm still on the stock turbo. I'm thinking if I spike to 30psi (hence the use of 110 for the track) I should be close to my goal. But I'm new to the Evo thing so all help is appreciated!

 

You could get away with 100 or 105. I also wouldnt recommend going 30psi on the stock turbo, you would probably overspeed it and it could tear itself apart. Get something like a Green, Red, or BBK.

Basically, if you use an excessively high octane fuel without much boost, it burns slow and you lose power.

 

Why do some people spike to 30-32psi on similiar mods with meth injection? Wouldn't it be somewhat the same to substitute Sunoco 110?