Quote Originally Posted by IDriveToast
What motor is this BTW? 2.5 Liter? Not many of those around except the QR25. And if you don't want to change anything at all...stock compression will be fine.

You can however up the compression to 10:1 and you response will be better. It's ultimately your decision. Since you're already at higher than 9:1 I would personally up it to 10:1.

Better response will be more productive than 1 or 2 extra pounds of boost.
Only motor I know of that 9.2:1 and 2.5L's is the Mazda 2.5L V6 KL. And with a name like 1 sick GT, He's definately driving a Probe GT. I would suggest going over to the Probetalk forums and looking off in the turbo forums. BTW, I think Mr.kidd made a great point. 10:1 comp. is great on a boosted car, but has more of a chance of detonation vs. a lower comp. without the lag time.
http://forums.probetalk.com/
There's a couple of guys there making easily well over 300 hp on not alot of boost. There's one guy there making 540 hp on 19 psi w/ stock crank and block, and turbo cams