modern factory turbo engines use an oil/vapor separator -- a catch can, with a check valve to prevent pressurizing the can. And another check valve to draw air through the air filter at higher speeds

PCV has two modes of operation:
1. Idle vacuum sucks a tiny bit of crankcase air through the Valve
2. non-idle airflow sucks crankcase air through air filter housing
The second is a problem with any engine that has excessive blowby such as a worn engine or a highly boosted engine. For excessive blowby a catch can is needed (or if the rings are worn, new rings are called for)

http://blog.modbargains.com/turbo-car-need-oil-catch-can/

http://stratifiedauto.com/blog/unders ... -upgrades-and-catch-cans/

Alternatively, some run a small vacuum pump to provide crankcase vacuum at all times. For example VW or Ford electric smog pump about $125. This allows using unmodified PCV system, just move PCV inlet from manifold to pump. Not sure if engineering will sign off on this