Dual Disa flap resting position question

e36ti · 11-17-2018, 07:08 PM

What is the resting position of the flap of the small and big disa valve on the intake manifold? I'm sourcing parts for the intake swap and getting new valves... I've seen the bigger one as open and the smaller one closed with no current applied. Hope this is an easy answer

e36ti · 11-17-2018, 07:26 PM

https://www.e90post.com/forums/showthread.php?t=37444

So should both be closed?

johnmyster · 11-20-2018, 12:37 PM

When the engine is off, they're both open. When the engine start (at idle) they both close. They're not spring return. They actuate (motor turns a worm gear, turns a spur gear) in both directions.

You're over thinking this. Open or closed is no indication of good or bad. For instance, if the engine was properly shut down before being pulled from the car, they'll be open. From a wreck, they might be still open. After I test them, I don't park them in any given orientation.

e36ti · 11-20-2018, 04:08 PM

Thanks this is very helpful

11-17-2018, 07:08 PM	#1
e36ti Private 11 Rep 85 Posts Drives: 2006 325i sport Join Date: Apr 2016 Location: United States iTrader: (0)	Dual Disa flap resting position question What is the resting position of the flap of the small and big disa valve on the intake manifold? I'm sourcing parts for the intake swap and getting new valves... I've seen the bigger one as open and the smaller one closed with no current applied. Hope this is an easy answer
	Appreciate 0 Tweet Quote

11-17-2018, 07:26 PM	#2
e36ti Private 11 Rep 85 Posts Drives: 2006 325i sport Join Date: Apr 2016 Location: United States iTrader: (0)	https://www.e90post.com/forums/showthread.php?t=37444 So should both be closed?
	Appreciate 0 Quote

11-20-2018, 12:37 PM	#3
johnmyster Private First Class 111 Rep 112 Posts Drives: 2011 e92 n52 Join Date: May 2017 Location: Virginia iTrader: (7)	When the engine is off, they're both open. When the engine start (at idle) they both close. They're not spring return. They actuate (motor turns a worm gear, turns a spur gear) in both directions. You're over thinking this. Open or closed is no indication of good or bad. For instance, if the engine was properly shut down before being pulled from the car, they'll be open. From a wreck, they might be still open. After I test them, I don't park them in any given orientation.
	Appreciate 0 Quote

11-20-2018, 04:08 PM	#4
e36ti Private 11 Rep 85 Posts Drives: 2006 325i sport Join Date: Apr 2016 Location: United States iTrader: (0)	Thanks this is very helpful
	Appreciate 0 Quote