Need Opinions: No Boost

[wrx2dsm]

Car has been running fine beside a slightly low idle, around 600-700 rpms. I jumped in the car and putted up my street letting it warm up. I pulled out into traffic and boost would go from vacuum to zero but not any higher. I have been hitting 13 psi consistently for months. The car seemed to run fine besides no boost. About 3 months ago I did a compression test and it came back 180 acroos the board. I have 111k on my stock motor. I checked my turbo the for shaft play about 3 months ago and it was very tight. The only thing that concerns me is the day before I had a weird metallic scrap on start-up. It sounded like a fan scrapping but lasted about 2 secs and was gone. Have not been able to repicate the sound. My question is: Would a spun bearing keep the car from boosting? Everything seems to point to a blown turbo...it has been smoking a little on startup lately and my bumper has been black around the exhaust. Im going to hit it up this afternoon after work and try and diagnose. I have not started the car since the no boost episode. I immediatly pulled back down my street and parked it. Any suggestions?

 

[justin0469]

always always always do a boost leak test before you jump to any conclusions you would be suprised. and blue smoke is usually sign of blown turbo (oil in exhaust), carbon build up on or around the exhaust usually isnt a sign