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I'm trying to figure out a problem child car. It's a 2007 mustang gt with a built 5.4. It has 9.4.1 compression and runs on 93 octane. It also has a 76mm turbo. I am wondering what other people have gotten away with compression and boost wise? The car has midly ported 3 valve heads and stock mustang gt camshafts.
 

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I have never run anything but C16 or Q16 in my 3v engine, but I used to run around 31 psi with the F1R combo at 9.4:1. The new engine has more compression and more boost.

I don't trust gas stations enough to try to push the limits on 93, but what sort of IAT's does it see and how heavy is the car?
 
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