Whining noise whilst spooling
 

Hi all,

I am new to this forum and am just after a bit of advice as not a lot of people I know have experience with evos. I got mine in November last year and its been fine, until the other day randomly I developed a whining noise when the turbo is spoiling - also doesn't pull as well as before. Lets say about a 15% reduction of what it is normally like. I'm getting mixed opinions of boost leak, turbo is going etc. There is no smoke or smell - but I have had a look at the turbo and it seems to have about 2mm play which I read is not good. Can anyone offer a bit of advice of what they think it could be/to look for? Sorry I am a bit useless and don't know much!

Thanks!

Sounds like a boost leak.

Should always check that first.

Are the blades contacting the housing?

There is some wear where it looks like the blades are contacting the housing, but it doesn't look fresh - not sure how much difference that makes.

Hello / Welcome aboard the boards @Evo8_Jess

As noted, a boost leak test is in order as well as confirming the shaft play in the turbo (possible worn shaft bearings)

Cheers, :beer:

Pull off turbo intake hose/pipe from MAF and check turbo wheel for play. If you have any play, get turbo rebuilt or swap to another.

You do realize that all turbos have play, correct?

That being said, there is a limit. 2mm is excessive. Have someone rev the engine while you listen under the hood to see where the sound is coming from. Bad journal bearing turbos can sound like a kazoo.

Glitched post

Not sure what happened to my last post, so I'll try again.
Yes Sean, all turbos have a tiny amount of play. I kept it simple for OP. I assumed he had a stock journal bearing turbo. If I feel 0.5mm of in/out play, I will rebuild because thrust plate is starting to wear. As for 2mm, that's about the limit for ballbearing turbos. Here's a journal bearing turbo with about 2 mm of play. Notice how the exducer made contact with the cover?
https://cimg7.ibsrv.net/gimg/www.evo...f058456b4a.jpghttps://cimg9.ibsrv.net/gimg/www.evo...2e0a01d294.jpg

I misread your post the first time. If your turbo has 2mm of play, replace it. Your wheel most likely made contact with the cover like in my pictures above.

Also, once JB turbo is rebuilt with new thrust plate and collars, my turbos have zero play. If I put my weight into it, the entire turbo will move when I push, pull, and force wheel sideways. That's my experience with rebuilding turbos. Let's not get into another pissing match because I have plent of turbos at home and don't want to waste my time recording and uploading.

If you truly have zero/immeasurable play, they're not going to last very long as there will insufficient clearance for oil to enter the bearing.