Okay, Ive been investigating a kind of howling noise under 7psi and about 2.5-3k rpms. Seems like it would have been compressor wheels rubbing the housing right? Or cracked vaccum hose, boost leak etc. Anyway, Havent done a boost leak check yet. This noise is only rockin out when I first start driving (warming the car up first to op temp). Well, Ive been hunting it but it hasnt really been too much of an issue, until today, Im boosting full on stock gauge, I can hear the spool, (no howl) and Im not pushing what I should. So at this point Im convinced my turbo is crapping out. So I come home, pull stuff off, and check for shaft play...none. Check blade damage, and for rubbing...none. Spins fine at idle...etc. Well, I get a good look and I see what looks like white deposits on the outside edges of the blades. Ive never seen this before. Then I think, maybe its scoring right? Hell, I dont know. The only thing Ive seen cause a white deposit (other than corrosion) is fluid in an extremely high temp condition, and Im running fine on temp, and this is the intake side (I live in western Wa.). Does anybody know what this is? Im going back outside with a beer and DSM'er attitude right now, I just wanted to post this before I lose daylight. Check the pic and let me know what you think.
-Ryan