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[ http://www.daveblack.net/asp/3SiFAQ.asp#bov2 ] Q: Should I have an open-loop or closed-loop BOV? A: The benefit of a closed loop BOV is that the air from the aft side of the turbo, when vented back into the intake, serves as a small boost of air to keep the turbo spooled up. With an open-loop, this air and energy goes to waste. In a closed-loop, it is reused as a spike of air sent by the BOV. This spike of air hits the turbo a split second after the BOV has opened, the perfect time for the energy to be spent spooling the turbo. So clearly, a closed-loop BOV better serves performance. An open-loop BOV justs makes your car sound cool and can even adversely affect performance because of the difference in air that the MAS has already accounted for and measured has been vented to the atmosphere and effectively wasted. Because of this "missing" air, the car can have issues running smoothly Later
Josh
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