My Whistling Turbo

I just recently replaced my turbo(broken shaft) on kw w900 and the whistle coming out of the air cleaner is almost unbearable. I know it's not normal because there is a slight loss of power.i replaced cac 6 months ago. The only thing I can think of is pressure testing the cac. Maybe a piece of the shaft went flying into the cac and put a hole in it. Idk

 

Did you disassemble and clean the intake air filter piping out from the turbo to the air cleaners, before installing the new turbo??? Did you install new air filters?

If none of this was done then you sucked all the broken pieces of the first turbo failure back into the new turbo and have destroyed the compressor wheel. The high pitch howling or whistle is from the damaged compressor wheel. Remove the air filter piping at the turbo and examine the compressor wheel for damage.

Any time you have a turbo failure that explodes the compressor wheel or breaks a shaft blows a tremendous amount of debris back into the air filters and air filter piping. The new turbo sucks it up and destroys itself. Every piece of air cleaner piping must be removed and separated to clean under the rubber hump hoses that connect each piece of piping together to the air filter housings. The high pressure blast of the air reversing during the turbo explosion expands them significantly and trap pieces of debris between the hoses and piping. The new turbo pulls them from under the hoses to destroy itself. Any debris that makes it to the air filter housings embeds itself in the air filters, which is then sucked out by the new turbo to destroy itself.

If you didn't clean the air filter piping and replace the air filters in this manner then the whistle is a damaged compressor wheel on the new turbo from the debris pitting the edge of the new wheel.

 

Yes sir My Haney I installed new air filters and cleared all of the hoses and blew out the cac.I do have a small leak(broken stud) on my exhaust manifold.Small amount of soot around the area leaking but it was like that before the turbo went and It didn't whistle like it does now.i would have fix the broken stud when I had it all off but I needed to be on the road ASAP I didnt have a arc welder to weld a nut on the stud to spin it out.Ive done it that way a few times.Thanks for chiming in. I hear nothing but good things about you.I'm also interested in giving this 6nz a tune.Let me know if your interested so I can get more details.

 

If you cleaned all piping and replaced the air cleaner's you should be fine. Pay to pull the intake to the turbo and check that no small bits were missed and have Gone through the new compressor wheel.
It could possibly just be your manifold leak getting worse if its more of a squeal than a whistle that you describe. If its bad enough you will be loosing drive pressure to spin the turbo which will cause low power and higher egt. It wouldn't hurt to pressure up the rest of the charge air system and look for leaks also.