Quote Originally Posted by Trannyman95 View Post
One of my turbo books talks about this, and even some Ford Diesel trucks run into this and the compressor wheel just explodes and sometimes guys get lucky and find it in the air filter box lol. If the compressor surges or the wheel hits a stall point it puts a lot of stress on the fins. It didnt look like the fines were digging into the housing but is hard to tell. I have seen turbos with a bad floating type bearing and the wheel just grinds into the housing and wears down the fins but I dont know about the way this one looks.
I've mostly seen it on the heavy diesel side because of the shop I'm at. Those things are fairly delicate, and at the same time put under extreme amounts of stress. Like you said, most of it ends up in the air cooler, and never really makes it to the engine, and then you have to end up having the cooler flushed.