Quote:
Originally Posted by Rotary Evolution
the stock crankcase vent system is fine for stock boost levels, beyond 10 psi even on a hybrid i would recommend opening it up to vent to atmosphere via a breather tank.
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I still have the stock ECU (w/Rtek 2.x mod) controlling boost, so boost pressures are limited to S5T2 stock levels - I never see more than 8~8.5 psi in the Rtek data logs or on the boost gauge. And with the BNR waste gate porting, this setup is well controlled, it never spikes or creeps upward beyond those levels.
Given that, I'm not sure what benefit I'd get from switching to a catch can/breather tank crankcase vent, other than keeping a little oil film out of the intake plumbing & IC.