Quote:
Originally Posted by spitfire481
its definitely metal. i drilled out the check valve in mine so it was wide open for my atmospheric vent catch can.
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BINGO
Yep. Blow by creates presure in the case. If the valve is shut over boost then the crankcase can't let the presure out. The front case vent isn't enough.
Put a cap plug on your intake plenum and vent to atmosphere. a filter popped on the barb is better than back presure. And BOOM!
When I boosted my Busa, I left my crackcase vent wide open. Not worth it not to.
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2014 Subaru BRZ
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