Quote:
Originally Posted by supraking
Just to clarify for everyone... DEFAULT (when the car is off) position of the flap is OPEN. When the car is started, air pressure is applied to the actuator through the vacuum hose, which in turn causes the flap to CLOSE. It REOPENS when increased RPMs and/or throttle load are present, and CLOSES AGAIN when revs/load drop back down.
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No, the flap is open for a while after the car is started. There's a VERY obvious change in tone when it closes on my car. I've got catless DPs and I park in a garage, and there's no mistaking when the valve closes.
The valve is vacuum actuated, but it's controlled by the ECU through a valve that's mounted in the trunk. Pulling the wire off the valve will do the same thing as unhooking the vacuum line and plugging it.