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The PCV is basically a controlled vacuum leak designed to suck the crankcase vapors back into the engine for combustion. It makes sense that you would have to tune differently with and without one. If you like fiddling with stuff I suggest a ME Wagner adjustable PCV valve which is pretty slick. Crankcase breathers are fine, but you are going to smell the funk of the engine while cruising.

[QUOTE="Bentworker, post: 395160, member: 3006"] The PCV is basically a controlled vacuum leak designed to suck the crankcase vapors back into the engine for combustion. It makes sense that you would have to tune differently with and without one. If you like fiddling with stuff I suggest a ME Wagner adjustable PCV valve which is pretty slick. Crankcase breathers are fine, but you are going to smell the funk of the engine while cruising. [/QUOTE]

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