Function of 545i Butterfly valve in exhaust?
06-23-2008 | 04:00 AM
#1
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Joined: Apr 2008
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Hello,
The right silencer endpipe of the 545i (2004 / Europe) has an active Butterfly valve.
It is placed in / just after de final resonator.
Does anybody know what is does?
Is it for noice reduction, or for smooter power?
Can it easily be put out of order?
What is the effect? Better sound?
Are the anny posible negative side effects?
Thanks
The right silencer endpipe of the 545i (2004 / Europe) has an active Butterfly valve.
It is placed in / just after de final resonator.
Does anybody know what is does?
Is it for noice reduction, or for smooter power?
Can it easily be put out of order?
What is the effect? Better sound?
Are the anny posible negative side effects?
Thanks
06-23-2008 | 06:35 AM
#2
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Joined: Mar 2004
Posts: 17,310
Likes: 2
From: Pittsburgh, PA USA
My Ride: G30 M550i
Model Year: 2018
Welcome to the forums.
Take a look here for some more information...
http://forums.e60.net/index.php?showtopic=2861
http://forums.e60.net/index.php?showtopic=2982
http://forums.e60.net/index.php?showtopic=4811
http://forums.e60.net/index.php?showtopic=20426
http://forums.e60.net/index.php?showtopic=39291
Take a look here for some more information...
http://forums.e60.net/index.php?showtopic=2861
http://forums.e60.net/index.php?showtopic=2982
http://forums.e60.net/index.php?showtopic=4811
http://forums.e60.net/index.php?showtopic=20426
http://forums.e60.net/index.php?showtopic=39291
06-23-2008 | 08:12 AM
#3
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Joined: Aug 2007
Posts: 1,871
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From: Atlanta Burbs
My Ride: 08 550 Carbon Sport Almost everything factory, but no sound upgrades.
Originally Posted by Rudy' post='608256' date='Jun 23 2008, 10:35 AM
Welcome to the forums.
Take a look here for some more information...
http://forums.e60.net/index.php?showtopic=2861
http://forums.e60.net/index.php?showtopic=2982
http://forums.e60.net/index.php?showtopic=4811
http://forums.e60.net/index.php?showtopic=20426
http://forums.e60.net/index.php?showtopic=39291
Take a look here for some more information...
http://forums.e60.net/index.php?showtopic=2861
http://forums.e60.net/index.php?showtopic=2982
http://forums.e60.net/index.php?showtopic=4811
http://forums.e60.net/index.php?showtopic=20426
http://forums.e60.net/index.php?showtopic=39291
Rudy, mine doesn't have a valve. Does yours?
I didn't have the car on a hoist so maybe I just can't see it. I did use a mirror.
06-23-2008 | 12:22 PM
#4
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Joined: Mar 2008
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From: Birmingham AL
My Ride: 2010 VW Passat Wagon 2.0l Tsi
Grey/Grey Budapest 18"
Lost to HPFP issues:
08 535i sport pkg
Lost to Dreaded E61 Sun roof leaks:
07 E61 530Xi
the short of it ...
German Noise Drive by standards...
Car can only make so many decibels up to about 45mph, then the car can be much louder.
Porches, VW ( yep the R32 has the "Flapper Valve") and many BMW and Mecs...
German Noise Drive by standards...
Car can only make so many decibels up to about 45mph, then the car can be much louder.
Porches, VW ( yep the R32 has the "Flapper Valve") and many BMW and Mecs...
06-23-2008 | 01:17 PM
#5
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From: expat in The Netherlands
My Ride: BMW 545iA Black Sapphire
Model Year: 2005
Engine: 545i
Originally Posted by bigbadbull' post='608484' date='Jun 23 2008, 10:22 PM
the short of it ...
German Noise Drive by standards...
Car can only make so many decibels up to about 45mph, then the car can be much louder.
Porches, VW ( yep the R32 has the "Flapper Valve") and many BMW and Mecs...
German Noise Drive by standards...
Car can only make so many decibels up to about 45mph, then the car can be much louder.
Porches, VW ( yep the R32 has the "Flapper Valve") and many BMW and Mecs...
06-23-2008 | 01:23 PM
#6
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Joined: Mar 2004
Posts: 17,310
Likes: 2
From: Pittsburgh, PA USA
My Ride: G30 M550i
Model Year: 2018
Originally Posted by sixcard' post='608287' date='Jun 23 2008, 12:12 PM
Just acanned through those links.
Rudy, mine doesn't have a valve. Does yours?
I didn't have the car on a hoist so maybe I just can't see it. I did use a mirror.
Rudy, mine doesn't have a valve. Does yours?
I didn't have the car on a hoist so maybe I just can't see it. I did use a mirror.
06-23-2008 | 02:23 PM
#7
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Joined: Mar 2004
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From: Long Island, NY
My Ride: 2008 535i: June 6th start build, complete June 17th, at NY Port July 5th, at dealer July 10th, took delivery Friday July 13- Plantimum Bronze/Natural Brown Leather/Light Poplar, Sport Package, Sport Auto, Active Steering, Premium Package, CWP & PDC. Dinan Performance Software 384hp & 421 ft/lbs.
The US cars have it. I would think It's for noise suppression; the inner pipe opens during strong acceleration.
06-23-2008 | 03:58 PM
#8
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From: Atlanta Burbs
My Ride: 08 550 Carbon Sport Almost everything factory, but no sound upgrades.
Originally Posted by pennetta' post='608598' date='Jun 23 2008, 06:23 PM
The US cars have it. I would think It's for noise suppression; the inner pipe opens during strong acceleration.
My 550 about same vintage as your 535 and does not have the butterfly.
06-23-2008 | 06:01 PM
#10
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From: Boston, MA
My Ride: 2008 535i 6MT
Originally Posted by Rizbel' post='608669' date='Jun 23 2008, 08:06 PM
Does this affect performance (Low end torque) or is this just for noise suppression at low RPM?
Thanks.
Thanks.