Quote Originally Posted by trism View Post
it works that way for any engine, turbo or not.

when youre on the go pedal, there is negative pressure in the intake pipe, which sucks the blowby gasses out of the catch can, and therefore out of the rocker cover/crankcase.

in fact in some super high power cars they actually run a separate vaccum pump connected to the crank case, because negative pressure helps with power production.
Whats the science behind this power increase? Less pressure below the piston rings in the crankcase affecting adversely affecting performance?