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Originally Posted by Irace86.2.0
I know that part. The controversy is more about the debate between open and closed loop systems as it relates to performance and reliability.
He mentioned the same thing. I think there is a difference between a drag car and a street car. The power difference might be more significant on a high horsepower vehicle, especially a V8, and especially on a vehicle trying to maximize power. Also, the drag car sees very little vacuum by comparison.
The alternative to an open system is a closed system with a PCV valve, which will have moments where it isn’t allowing the crank to vent, so I guess the question is which is best/worst: a system with vacuum pulling air and pressure spikes during boost, or a vented system with no vacuum, but no spikes either? I don’t know.
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I should have the posts more closely. Sorry. You know much more about running boosted engines than I, but, for environmental reasons I would scavenge the crankcase rather than vent to atmosphere. If I read Calum correctly he contends the performance impact is significant . I have not seen any definitive research on that subject, but as I said, I'd run closed loop, if only for pollution mitigation.