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The concept of a catch can being mainly/solely for prevention of carbon build up is something that is completely exclusive to the D/I platforms. Traditional use has been always been completely different.
As the O/P is running a VTA system, regardless of what anyone wants to say, has almost 0 to do with the PCV system in which a catch can system compliments. The reduction in buildup shows the catch can aided in pro longing it for what its worth, but the real issue is within the design of the cylinder head itself.
The real place for a catch can on a performance minded turbo charged engine is to keep oil vapor out of your combustion chamber and out of your charge pipes/intercooler. The BT guys and highly pushed stock turbo guys will see this on the most major scale.
As the O/P is running a VTA system, regardless of what anyone wants to say, has almost 0 to do with the PCV system in which a catch can system compliments. The reduction in buildup shows the catch can aided in pro longing it for what its worth, but the real issue is within the design of the cylinder head itself.
The real place for a catch can on a performance minded turbo charged engine is to keep oil vapor out of your combustion chamber and out of your charge pipes/intercooler. The BT guys and highly pushed stock turbo guys will see this on the most major scale.