I went from a standard PCV system to a draft style system that is close to a fixed oriface PCV on my FiTech. I didn't notice any change in idle characteristics, nor did I have to make any tuning changes.
The item that made the biggest difference in idle quality was moving to timing control. Being able to dump in idle timing and letting the system idle stabilize by adjusting advance relative to fuel made a fairly dramatic difference in both idle quality, temperature control and idle vacuum. I gained over 2" Hg at idle by going to timing control and commanding about 24 degrees of initial advance.
This worked so well, that my once "somewhat rowdy" 455 with a 232/238 112 cam behaves and sounds as if it has more of a factory type cam in it.
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-Jason
1969 Pontiac Firebird
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