exhaust butterfly

m-teknik · 07-31-2009, 07:16 PM

what is this valve for ? what is it's function and how does it work ? which models have this part ? thanks

BMWh0r3 · 07-31-2009, 07:22 PM

Quote:

Originally Posted by m-teknik

what is this valve for ? what is it's function and how does it work ? which models have this part ? thanks

search golf-tee mod

330i_guy · 07-31-2009, 09:24 PM

i have it on my 330 also but not sure what it is or how does it work...

eneka · 07-31-2009, 09:43 PM

Quote:

Originally Posted by 330i_guy

i have it on my 330 also but not sure what it is or how does it work...

it's supposed to make the car quieter at lower RPMs and at idle.
My facelift 325i has it too.
The golf tee mod tell you how to remove the tub and plug it with a golf tee.

m-teknik · 08-01-2009, 04:09 AM

why did I ask this valve ? because I want electrical cut-off for my 330i. Electrical cut-off valves are expensive , they require more work and I prefer always stock parts. So I want to have electrically operated loud and quite muffler , can we operate this valve with electrical switch ?

I found this figure. I think M54 330i have the same shape.

ejamin73 · 08-01-2009, 04:20 AM

Quote:

Originally Posted by eneka

it's supposed to make the car quieter at lower RPMs and at idle.
My facelift 325i has it too.
The golf tee mod tell you how to remove the tub and plug it with a golf tee.

Mine doesn't have it & it's an '04 325i

330i ZHP · 08-01-2009, 04:40 AM

hmmm, i thought only 330's had the valve

mkodama · 08-01-2009, 06:10 AM

Quote:

Originally Posted by 330i ZHP

hmmm, i thought only 330's had the valve

That's what I read as well...

m-teknik · 08-01-2009, 10:38 AM

Quote:

Originally Posted by BMWh0r3

search golf-tee mod

I had just understood this mod. Also I tried on my car today. But no different sound at idle. It may be %3 more , but can not noticable.

MysticBlau330Ci · 08-01-2009, 12:13 PM

Mine is fully open at idle. I was driving behind a 330CiC and it was open at idle too(car at a standstill). But when the driver moved off (not too fast) it started to close. I guess it would re-open at some point later.

m-teknik · 08-01-2009, 04:22 PM

Infact I need quite exhaust at idle speed and sport sound at higher (3000+) rpm... Is there any reasonable solution for street car ?

Acarder · 08-01-2009, 05:17 PM

US 330's have it, and 6 cylinder (ie 2 exhaust) euro's have it.

Man the M52TU muffler is stupidly designed, time to cut mine off.

Quote:

Originally Posted by m-teknik

Infact I need quite exhaust at idle speed and sport sound at higher (3000+) rpm... Is there any reasonable solution for street car ?

Buy a Aston Martin? You'd be hard pressed to find an exhaust for the E46 that had a custom actuator set up built in to do what you want... If you got headers and used the stock muffler you'd be able to benefit from the stock butterfly valve that opens and closes while still increasing sound

eneka · 08-01-2009, 09:18 PM

Quote:

Originally Posted by Acarder

US 330's have it, and 6 cylinder (ie 2 exhaust) euro's have it.

my U.S. 2003 325i has it..

Acarder · 08-01-2009, 10:10 PM

Quote:

Originally Posted by eneka

my U.S. 2003 325i has it..

Are you sure someone didn't slap a 325 badge on your 330?

Seriously though, ugh I thought I had it down which cars came with them. It seems pretty inconsistant. Maybe if your VIN ends in an even number you get a clutch stop, and if it ends in a prime number you get a butterfly valve.

eneka · 08-02-2009, 02:01 AM

Quote:

Originally Posted by Acarder

Are you sure someone didn't slap a 325 badge on your 330?

Seriously though, ugh I thought I had it down which cars came with them. It seems pretty inconsistant. Maybe if your VIN ends in an even number you get a clutch stop, and if it ends in a prime number you get a butterfly valve.

nah i bought the car new from a dealer so i'm pretty sure it's a 325...
hmm...i guess ima go poke my head around other e46 exhaust pipes to see if they have one too..

m-teknik · 08-02-2009, 06:13 PM

Quote:

Originally Posted by m-teknik

Also I tried on my car today. But no different sound at idle. It may be %3 more , but can not noticable.

I edit my comment. I tried for a few days on my car and it has tougher sound. But do not hope aggresive sound , it became only deeper sound.

josephi · 08-02-2009, 09:41 PM

Quote:

Originally Posted by MysticBlau330Ci

Mine is fully open at idle. I was driving behind a 330CiC and it was open at idle too(car at a standstill). But when the driver moved off (not too fast) it started to close. I guess it would re-open at some point later.

That's the opposite of mine. '02 330i. Just checked it with the engine off, and it was fully open. I started the engine and checked it again at idle, and it was fully closed. I did try the golf tee mod for a while and found that the exhaust tone at low rpms was deeper, but being an older guy, I prefer a quieter and mellower sound, so I hooked the hose back up.

uninc4709 · 08-02-2009, 09:44 PM

pretty sure 325s dont have the valve

josephi · 08-02-2009, 09:46 PM

Quote:

Originally Posted by m-teknik

I had just understood this mod. Also I tried on my car today. But no different sound at idle. It may be %3 more , but can not noticable.

After applying the golf tee mod, are you sure the flap is fully open at idle? The reason I ask is because when I first tried it, I found that my flap remained closed because it was not rotating freely, probably due to corrosion in the hinge, which means that it was probably stuck closed even when I was doing high rpms on the road. I sprayed some WD-40 up into the hinged area and worked it opened and closed until it loosened up.

m-teknik · 08-03-2009, 01:21 AM

This may be the same reason for my first drive , I noticed the difference after my first trial....

07-31-2009, 07:16 PM	#1
m-teknik Registered User Join Date: May 2009 Location: Turkey Posts: 30 My Ride: '04 330i View My Garage	exhaust butterfly what is this valve for ? what is it's function and how does it work ? which models have this part ? thanks Attached Thumbnails

08-01-2009, 04:40 AM	#7
330i ZHP OEM ///Member Join Date: Mar 2005 Location: Washington, DC Posts: 12,947 My Ride: slow cars View My Garage	hmmm, i thought only 330's had the valve __________________ - Stuart

08-01-2009, 12:13 PM	#10
MysticBlau330Ci Registered User Join Date: May 2005 Location: 170 to NOVAE Posts: 1,476 My Ride: 330Ci '04 View My Garage	Mine is fully open at idle. I was driving behind a 330CiC and it was open at idle too(car at a standstill). But when the driver moved off (not too fast) it started to close. I guess it would re-open at some point later. __________________

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07-31-2009, 09:24 PM	#3
330i_guy Registered User Join Date: Jun 2007 Location: houston Posts: 192 My Ride: 330i View My Garage	i have it on my 330 also but not sure what it is or how does it work...

08-01-2009, 04:09 AM	#5
m-teknik Registered User Join Date: May 2009 Location: Turkey Posts: 30 My Ride: '04 330i View My Garage	why did I ask this valve ? because I want electrical cut-off for my 330i. Electrical cut-off valves are expensive , they require more work and I prefer always stock parts. So I want to have electrically operated loud and quite muffler , can we operate this valve with electrical switch ? I found this figure. I think M54 330i have the same shape.

08-01-2009, 04:22 PM	#11
m-teknik Registered User Join Date: May 2009 Location: Turkey Posts: 30 My Ride: '04 330i View My Garage	Infact I need quite exhaust at idle speed and sport sound at higher (3000+) rpm... Is there any reasonable solution for street car ?

08-02-2009, 09:44 PM	#18
uninc4709 Registered User Join Date: Jun 2009 Location: Minnesota Posts: 146 My Ride: 2002 BMW 325i 5spd View My Garage	pretty sure 325s dont have the valve

08-03-2009, 01:21 AM	#20
m-teknik Registered User Join Date: May 2009 Location: Turkey Posts: 30 My Ride: '04 330i View My Garage	This may be the same reason for my first drive , I noticed the difference after my first trial....