|
An OCC still will not catch all the crank vapors. The PCV system on the N54 has two modes, one when at idle/decel (off boost) and one when accelerating (on boost). When on boost, the vapors get diverted to the rear intake, pre-turbo since the intake manifold is pressurized (above atmosphere). This is where your OCC/breather can benefit, as it intercepts these gasses so that the Turbo/Intercooler do not get a coating of oil.
However, when off boost, the intake manifold is under vacuum, so they crank vapors get diverted directly to the intake manifold. The pcv system for this "mode" is built into the valve cover. There is nothing we can do for this unfortunately, other than installing meth. injection or periodically cleaning the valves/intake manifold with Seafoam or some other top engine cleaner.
Meth/water injection would go a long way towards keeping the valves and intake manifold clean.
|