sound when letting off gas with DCI?

tomtom11 · 05-19-2013, 11:56 PM

hello, I am well aware of the whooshing sound the DCI makes. but today when i was driving and had my foot down and then let off the gas the car made a sound that is hard to describe almost like a flap shutting. I noticed that when quickly letting off near full throttle under load in a higher gear and in low-mid RPMs 4th or 5th, around 2500k, lets say does anyone know what i am talking about? thanks

E90Company · 05-20-2013, 12:18 AM

You are hearing the diverter valves release their pressure back into the compressor inlet pipes.

KMEninety335 · 05-20-2013, 12:51 AM

Quote:

Originally Posted by E90Company

You are hearing the diverter valves release their pressure back into the compressor inlet pipes.

What he said. You can hear them easier when you get an open intake like a dci

oshusttoley · 05-20-2013, 01:55 AM

I get same exact sound after installingy bms dci's. I have a bov too so ..... It sound horrible. I let go of gas then I hear the "flutter" then the bov releasing the air

tomtom11 · 05-20-2013, 08:30 PM

huh so its completely normal? i guess i never noticed it before.

05-19-2013, 11:56 PM	#1
tomtom11 Captain 91 Rep 703 Posts Drives: 335i Join Date: Jan 2011 Location: Earth iTrader: (1)	sound when letting off gas with DCI? hello, I am well aware of the whooshing sound the DCI makes. but today when i was driving and had my foot down and then let off the gas the car made a sound that is hard to describe almost like a flap shutting. I noticed that when quickly letting off near full throttle under load in a higher gear and in low-mid RPMs 4th or 5th, around 2500k, lets say does anyone know what i am talking about? thanks Last edited by tomtom11; 05-20-2013 at 12:12 AM..
	Appreciate 0 Tweet Quote

05-20-2013, 12:18 AM	#2
E90Company Major General 200 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	You are hearing the diverter valves release their pressure back into the compressor inlet pipes.
	Appreciate 0 Quote

05-20-2013, 01:55 AM	#4
oshusttoley Captain 53 Rep 676 Posts Drives: 2008 335i sedan Join Date: Mar 2012 Location: New Jersey iTrader: (0)	I get same exact sound after installingy bms dci's. I have a bov too so ..... It sound horrible. I let go of gas then I hear the "flutter" then the bov releasing the air
	Appreciate 0 Quote

05-20-2013, 08:30 PM	#5
tomtom11 Captain 91 Rep 703 Posts Drives: 335i Join Date: Jan 2011 Location: Earth iTrader: (1)	huh so its completely normal? i guess i never noticed it before.
	Appreciate 0 Quote