17PSI on a stock fuel system is way too much. You are experiencing Detonation. Dial the boost back to around 13-14psi and you should be ok but keep in mind you need to upgrade your fuel system and get some kind of fuel management. There is a great option out there for the factory turbo cars, it's called DSM Link. Do a little research on the net for it and you will find it gives you almost limitless tuning ability and tons of room for future mods. From personal experience with this I've seen very large gains on mild modded cars.

-Kevin

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95 Eclipse RS - Rolled
96 Eclipse GS - Traded
95 Eclipse GSX- Sold
01 Blazer LS 4.3/5spd dropped and clean DD
88 Camaro RS 361 CID with a 6spd and a bar 10 second street car on motor.