Suspected turbo rattle IS20

did an is20 swap about 4000 miles ago, turbo has about 22,000 miles on it, I don't know if this was there from the beginning or not but it sounds like its getting worse. There is a metal rattling/flapping sound coming from the engine bay. The sound is not there off throttle, or when I am off boost completely. But if I am making slight boost, like 1/4 throttle with the revs climbing slowly it is there. It is not RPM dependent, if I stay in a low gear and let off the throttle and keep the RPM's up and ease back into the throttle again, its there. The rattle seems to go away as the boost increases. Tried to record it but my phone is not picking it up. I had the intake off last weekend and took some pictures of the turbo and everything looks clean, don't feel any wiggle in the shaft either. Going to check it again this weekend as well as the exhaust side to see what I find. Anyone have any ideas, getting paranoid with all the is20 turbo failures on the older Rev, which is what I have (rev R). I have also been checking oil temps and they are normal, IAT is normal, and in my logs I am always hitting requested boost. Any input would be great so I could stop being paranoid and enjoy the car again.

Only thing I can suggest is checking the bolt on the v band clamp holding the downpipe to the turbo. Pretty common for them to come loose over time and rattle.

ian124 said:

Only thing I can suggest is checking the bolt on the v band clamp holding the downpipe to the turbo. Pretty common for them to come loose over time and rattle.

Click to expand...

Great, I'll try and tighten this down tonight, there is a little more of a gap on the top of the clamp then there was when I installed it, but grabbing I cant get any sort of wiggle or movement, but its worth a shot.

If the wheels were actually ratting around and touching the turbo housing I should see visible damage correct, there is no way that much sound could be coming through without there being physical signs if that is the case.

http://www.golfmk7.com/forums/showthread.php?t=28690
Maybe?

V-band was loose, a good 2 turns, I sure hope that was it.

Melted, thanks for the idea, I do have a rattle in my waste gate arm, but not at the electric actuator, only at the turbo arm/flap, going to keep this in mind though if the vband tightening doesn't solve it.

Had some time to drive it now and get it up to full temp, which is when the rattling would come about more obviously. Everything is all good now after tightening down that V-band clamp

Damn man you won the lottery there! I could see the white smoke coming out already....

Jumped the gun, rattle is still there, any more ideas?

https://photos.app.goo.gl/oipcRxy08H5z2xha2

That's the rattle from my waste gate, anyone think thats it? Checked the wheel on the intake side, spins super smooth and no movement or deflection when I try

https://photos.app.goo.gl/lQfn5Yka3LvUMd8K2

Photos of the turbo from the intake side

I might have missed something but it sounds load dependent. So maybe when the engine is in a loaded position due to acceleration you have some heat shield somewhere that's making contact with exhaust or somethign else?

Just got the car back from the dealer, the bushing in the factory pendulum mount failed and was allowing metal on metal contact and that's the rattling sound I was hearing. Just an update for anyone in the future searching out possible causes for rattles in their own car.

Where is that located? Getting a odd machine gun sound on acceleration/load that appeared last week. Have a dealer appointment next week.

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