billcruise

The last couple of days I replaced the stock Carrera S turbos with GTS turbos. On the passenger side turbo, I found motor oil at the exit of the turbo. I also noticed a what I would call ‘a considerable amount of radial’ movement in the old turbo. Is this common in a car with 18,000 miles? Anything I need to do? See picture

991Targa4S

Is there any oil on the (cold) compressor inlet line?

If you only have oil going out but no oil going in than you need a turbo rebuild or replacement.

if you have oil going in and its wet on the whole intake line going in the the compressor, then it may only be the Air Oil Separator

VektorPerformance

That pic shows oil in the compressor inlet. Unfortunately, it's common on the 991.2 passenger side turbo. As far as the turbo goes, as long as the play is not to the point where the wheel contacts the sides of the housing, and you're properly making boost, the turbo is good-to-go.

An option in addressing the oil pooling in the turbo (and rest of the intake tract downstream), is an Air/Oil Separator. We happen to have such a product. If you'd like to see more info on the location, mounting, and even customer experience with the product, check out THIS LINK.

Let us know if you have any questions.

asellus

FYI that's the inlet, not the exit.

The passenger turbo inlet is where the PCV dumps for the engine, it's the plastic tube you had to unclip on the 180 degree bend piece you removed to take this picture. It is perfectly normal to have some amount of oil there. Look into Vektor's oil collector if you find this bothersome.

Minor axial play is fine, there should be a spec for it somewhere but all turbos will have some amount of axial play from the factory. It's the radial play that you want to worry about.

991Targa4S

My point is if there is no oil in the intake line that mates up with the compressor in the picture than its likely your turbo.

billcruise

Yes, my bad, it’s the inlet. I’ll check out the Vektor separator

spdracerut

In the case of a turbo with bad bearings (blown turbo), it would not be uncommon to have oil up in the compressor inlet pipe too. Either going through the recirculated blow-off valve or getting recirculated at the compressor inlet itself due to compressor surge. Usually if a turbo is this far gone, the telltale white oil smoke out the exhaust will show.

spdracerut

So.... what else are you going to modify

AlexZTuned

Vektor AOS will eliminate the problem. It’s common on all 9A2 3.0 engines.

My passenger side turbo had a similar pool of oil and it was also covering the inlet and charge pipes - had to wipe down the inside the intercooler end tanks.

When I swapped to TiAL M660’s, I installed the Vektor AOS catch can which was super easy and worth every penny.