Resolved 20G Turbo Death Whine? (Was a Coupler Blown Halfway Off)

[Chumpaumpalumpa]

So last night while doing pulls I thought I heard a bit of whining but wasn't sure. After just driving around regularly the rest of the night it started getting louder and louder. At this point I was concerned so I was babying it. It now sounds like the infamous "supercharger" whine but only if its loaded. Starts maybe around 10inHg and gets louder as pressure increases. I limped her home last night really gently so as not to make the noise anymore. Pulled the intake off and no axial shaft play and a little radial but not so much that it can contact the housing, There was a little puddle of oil in the intake pipe and the turbo inlet. But that has been there for quite a while and there was no more than usual. Doesn't smoke under boost either. 200mi old oil. Turbo fed off the head. Ideas?

 

[Diamond Star Werks]

Boost leak.

 

[Chumpaumpalumpa]

Boost leak.

Even though it does it in vacuum you think?

 

[ErikTande]

Does it sound like this?

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[Chumpaumpalumpa]

Boost leak.

Found a coupler blown halfway off........ Getting tools to fix it.

Does it sound like this?

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I think so, been a while since I heard it.

 

[jakk220]

Found a coupler blown halfway off........ Getting tools to fix it.

This is more than likely your answer

 

[Chumpaumpalumpa]

Phew all better

 

[Diamond Star Werks]

Even though it does it in vacuum you think?

Vacuum seen on your boost only applies to the pressure behind the throttle body (assuming you don't have a reference from the pipes or turbo housing). Therefore you should know and remember there is practically no vacuum post compressor and pre-throttle body. Intake piping gets pressurized before the intake manifold. Even though the manifold is under vacuum the pipes will still be pressurized.