Cm870 Turbo noise......new turbo?

[tlzimmerman]

Well I thought I had found the source of my turbo noise....I was wrong. The egr cooler hose was off, and then when hooked up I figured out it was blown. I thought what I was hearing was boost leaking. Opened the doghouse and fixed the egr hose.....still have a horrendous turbo noise.

With the doghouse off I can hear it better. Anytime it builds boost it "shreeks" for lack of a better term. I know its the original turbo with 500k on it, and now I am thinking it is out and just needs replaced. Truck will pull with everything hooked back up, but doesn't have near the power it should and I think it isn't building boost. I cannot find any boost leaks anywhere, and I've been over the charge air circuit with soapy water at each joint now while running at 1400 RPM.

Here is a video of what I am hearing. Anyone want to toss in their .02 on what is wrong? I would be happy to perform any tests anyone can think of to narrow it down. I feel like the turbo is coming off next no matter what. I am planning on getting the ebay inline5....am I going to need it to diagnose this? I assume if I replace the turbo since it is actuated it would need calibrated right?

https://www.youtube.com/watch?v=Lm0svUInNHs

We have about 30 days til the truck needs to run....so I have that long to figure it out LOL. Thank you again for helping out an inexperienced ISX owner.