[MiKc]

Hey guys,

I've done some research when I started hearing a bit of siren whine from my car during acceleration and found that it might be a sign of turbo going?
This morning, the siren noise "broke loose" and it is extremely loud now

Anyone experienced this issue before?

Video here

[MiKc]

Anyone....?

[zooch7]

When mine failed I didn't get that. Mine just smelt like ground metal and oil. Are you boosting still? Any codes?

[Gizm0]

I had the same noise on mine, it ended up being the coupler on the hot side of my VRSF intercooler that came loose...

[MiKc]

Originally Posted by zooch7

When mine failed I didn't get that. Mine just smelt like ground metal and oil. Are you boosting still? Any codes?

Wow, that's scary. I should definitely get a OBD reader...
Not sure if im still boosting...any idea on how to check other than reading the code?

Originally Posted by Gizm0

I had the same noise on mine, it ended up being the coupler on the hot side of my VRSF intercooler that came loose...

Did you have the faint siren noise before this happened?
Im running on stock intercooler...guess that could've gone loose on its own

[bdhh]

Yes that is probably your turbo. But need to do a pressure test of your whole boost system first. You will need a compressor? Just had the exact same noise on my car & I did a lot of pressure testing up to 15 ps, hoping that it was a boost leak. Found lots of boost leaks, but they were not the problem. Removed inlets & down pipes & turbos looked fine. No oil or play. Next I used a might vac, & applied vac to the waste gates separately. Power braking under load I would get the noise with vac applied to just front or just back turbo. I think because there is enough flow from the exhaust to spin both. But when I just revved in neutral I only had noise on the rear turbo only. This told me that my rear turbo bearing or shaft has failed. I did have a low boost code, but if the bearing is going it may still boost for awhile?
Hope this helps?

[MiKc]

Originally Posted by bdhh

Yes that is probably your turbo. But need to do a pressure test of your whole boost system first. You will need a compressor? Just had the exact same noise on my car & I did a lot of pressure testing up to 15 ps, hoping that it was a boost leak. Found lots of boost leaks, but they were not the problem. Removed inlets & down pipes & turbos looked fine. No oil or play. Next I used a might vac, & applied vac to the waste gates separately. Power braking under load I would get the noise with vac applied to just front or just back turbo. I think because there is enough flow from the exhaust to spin both. But when I just revved in neutral I only had noise on the rear turbo only. This told me that my rear turbo bearing or shaft has failed. I did have a low boost code, but if the bearing is going it may still boost for awhile?
Hope this helps?

Awesome, thanks so much for the elaborate response
Will definitely check some points you've mentioned

Thanks again

[mifesto]

if your turbo is blown, you'll get more then just noise. are you getting a cloud of burnt oil coming of your exhaust? do you get bmw boost error code? i would imagine you would... i mean if you aren't boosting anymore, you WILL feel your car fall on its face. you seriously have no clue how your car feels?????? it's hard to believe you cant tell difference...

i did view your turbos, it sure does sound like blown turbo howl from when i experienced it in my supra long ago. (man brings back bad memories)...

[ny325]

$$$$$$$$

[N54Twin]

Is this the noise u having?

If YES, u need new snails.

[MiKc]

Thanks for the responses guys!
I sent the car in and BMW did find blown rear turbo so it is getting replaced under warranty
No more nightmares!