Enabled butterfly valve back on, anyone else did the same?

E90330iS · 02-01-2008, 11:33 PM

Hello guys, I have driven with with it disabled for about 12K and the exhaust sound was definitely amplified ranging from 1600 RPM to 2600 RPM (330i here). However, after reading that disabling the valve may have some backpressure power loss or fuel economy loss I decided to revert the process and switch the mechanism back on. So far, I have driven another 100 miles with it and did not feel like the car is faster with it back on although the sound has definitely been reduced again. Anyone wanna share their experience with the power and fuel economy issues?

McLuVan · 02-02-2008, 12:11 AM

Is the butterfly valve the same as the golf tee mod?

akack79 · 02-02-2008, 12:23 AM

Quote:

Originally Posted by Valley_Boy

Is the butterfly valve the same as the golf tee mod?

Yes.

TheBreak · 02-02-2008, 12:39 AM

any link to info on how to disable it? is it just a breaker?

E90330iS · 02-02-2008, 01:14 AM

Pull out the black tube from the mechanism and plug a golf tee inside as tight as you can and ziptie it

HyperM3 · 02-02-2008, 08:28 PM

Quote:

Originally Posted by TheBreak

any link to info on how to disable it? is it just a breaker?

Theres tons of threads on the subject currently going on at the moment.

Year's_End · 02-03-2008, 12:54 AM

I just pulled the plug behind the left taillight (same effect), and it sounded great. However, I put the plug back in due to the same reasons. I dunno if I want to keep it, but the car feels the same to me.

Sounded great though...

DreX3M · 02-03-2008, 09:14 AM

I'm contemplating about retrofitting the valve to my miltek exhaust. That way I would have the option of going stealth (golf tee mod) or full frontal with it bypassed depending on my mood.

Anyone care to share some insights or comments on how difficult/tedious it might be to retrofit the valve.. and also of any potential side effects of doing so.

E90330iS · 02-04-2008, 09:29 PM

Long did mention that a person with an aftermarket exhaust lost power when the vaccum tube was not plugged in. However, it is unneccessary to retrofit the mechanism if you are not moving the valve into your aftermarket exhaust also.

02-01-2008, 11:33 PM	#1
E90330iS Major General 143 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	Enabled butterfly valve back on, anyone else did the same? Hello guys, I have driven with with it disabled for about 12K and the exhaust sound was definitely amplified ranging from 1600 RPM to 2600 RPM (330i here). However, after reading that disabling the valve may have some backpressure power loss or fuel economy loss I decided to revert the process and switch the mechanism back on. So far, I have driven another 100 miles with it and did not feel like the car is faster with it back on although the sound has definitely been reduced again. Anyone wanna share their experience with the power and fuel economy issues? __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
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02-02-2008, 12:11 AM	#2
McLuVan Lieutenant General 304 Rep 13,114 Posts Drives: ///M3 Join Date: Jan 2008 Location: Socal~818~ iTrader: (1)	Is the butterfly valve the same as the golf tee mod? __________________
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02-02-2008, 12:39 AM	#4
TheBreak Private First Class 1 Rep 136 Posts Drives: 2008 E92 335i Join Date: Jan 2008 Location: Los Angeles iTrader: (0)	any link to info on how to disable it? is it just a breaker?
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02-02-2008, 01:14 AM	#5
E90330iS Major General 143 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	Pull out the black tube from the mechanism and plug a golf tee inside as tight as you can and ziptie it __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
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02-03-2008, 12:54 AM	#7
Year's_End Lieutenant General 1138 Rep 12,444 Posts Drives: 2020 Shelby GT350 Join Date: Feb 2007 Location: FL iTrader: (0)	I just pulled the plug behind the left taillight (same effect), and it sounded great. However, I put the plug back in due to the same reasons. I dunno if I want to keep it, but the car feels the same to me. Sounded great though... __________________ Past: '08 E92 335i\|ZPP\|ZSP\|6AT Past: '15 Mustang GT\|401A\|PP\|6MT Current: '20 Shelby GT350\|6MT
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02-03-2008, 09:14 AM	#8
DreX3M Private First Class 5 Rep 153 Posts Drives: F97-X3M Competition Join Date: Jun 2007 Location: Bay Area, California iTrader: (0)	I'm contemplating about retrofitting the valve to my miltek exhaust. That way I would have the option of going stealth (golf tee mod) or full frontal with it bypassed depending on my mood. Anyone care to share some insights or comments on how difficult/tedious it might be to retrofit the valve.. and also of any potential side effects of doing so.
	Appreciate 0 Quote

02-04-2008, 09:29 PM	#9
E90330iS Major General 143 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	Long did mention that a person with an aftermarket exhaust lost power when the vaccum tube was not plugged in. However, it is unneccessary to retrofit the mechanism if you are not moving the valve into your aftermarket exhaust also. __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
	Appreciate 0 Quote