Vanguard exhaust drone idea. Input please

dadgar · 08-30-2012, 08:02 PM

Hey so I have a fully catless automatic with a vanguard exhaust. There is a fair amount of drone from 1500-2200ish RPM. I drive this car for an hour and a half a day so it is getting a bit bothersome. So I was considering welding on the exhaust flap from the oem exhaust onto the vanguard to quiet things down.

So I know that exhaust pressure would need to be equalized across the two sides. The oem has a link right in the mufflers while the Vanguard has an H pipe in the midpipe. Would this still allow pressure equilibrium. Another question, at what RPM does the exhaust flap open up normally?

Any input would be appreciated or suggestions. Thanks guys

EJ_3 · 08-30-2012, 08:06 PM

Before I did the 'golf tee mod.' I can recall the flap opening up around 2.8-3k RPM. Then again it's been years, so don't quote me on that. Good luck with your project.

Stucks · 08-31-2012, 08:13 AM

Just install some high flow cats. it will settle things down.

neilvosko · 08-31-2012, 11:55 AM

or vibrant resonators

elim11 · 08-31-2012, 12:52 PM

How about a hemholtz resonator? That seems like the only real way to reduce drone. Vibrant resonators will help with rasp.

dadgar · 08-31-2012, 12:54 PM

Quote:

Originally Posted by neilvosko

or vibrant resonators

Is there a point, the exhaust already has two resonators!

dadgar · 08-31-2012, 12:55 PM

Any one have a link to a good set of HFC's?

cstmx_ryder · 08-31-2012, 01:48 PM

Don't weld ANYTHING to the Vanguard......Please.

Just cruise at a higher RPM (about 2-3 hundred more than you normally would), and the drone will be virtually unnoticed.....

I have the same setup.....

vfeng · 08-31-2012, 02:17 PM

Quote:

Originally Posted by cstmx_ryder

Don't weld ANYTHING to the Vanguard......Please.

+1

dadgar · 08-31-2012, 08:01 PM

Welding the exhaust flap shouldn't be a big deal. If I decide it is better stock, by unplugging the vacuum tube it essentially will be. My main question really is if there is a cover on one of the pipes will the H pipe allow pressure equalization. I dont want it to cause any problems.

08-30-2012, 08:02 PM	#1
dadgar Private First Class 14 Rep 130 Posts Drives: E92 M3 Join Date: May 2010 Location: Boston, MA iTrader: (3)	Vanguard exhaust drone idea. Input please Hey so I have a fully catless automatic with a vanguard exhaust. There is a fair amount of drone from 1500-2200ish RPM. I drive this car for an hour and a half a day so it is getting a bit bothersome. So I was considering welding on the exhaust flap from the oem exhaust onto the vanguard to quiet things down. So I know that exhaust pressure would need to be equalized across the two sides. The oem has a link right in the mufflers while the Vanguard has an H pipe in the midpipe. Would this still allow pressure equilibrium. Another question, at what RPM does the exhaust flap open up normally? Any input would be appreciated or suggestions. Thanks guys
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08-30-2012, 08:06 PM	#2
EJ_3 Colonel 371 Rep 2,838 Posts Drives: e92 335i, e34 525i & e60 530i Join Date: Aug 2011 Location: N Las Vegas iTrader: (13) Garage List 2007 BMW 335i [8.34] 2016 Ram 1500 Sport [8.00] 1994 BMW 525i [10.00] 2007 BMW 530i [8.66]	Before I did the 'golf tee mod.' I can recall the flap opening up around 2.8-3k RPM. Then again it's been years, so don't quote me on that. Good luck with your project. __________________ click here for mods
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08-31-2012, 08:13 AM	#3
Stucks Lieutenant Colonel 172 Rep 1,909 Posts Drives: 2017 F30 340i Xdrive Join Date: Oct 2010 Location: Montgomery County, MD iTrader: (12)	Just install some high flow cats. it will settle things down. __________________ Current: 2017 F30 340i xdrive Previous: 2008 e92 335i coupe: RB turbos, mach 116 race fuel, methanol, alot of boost. Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)
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08-31-2012, 11:55 AM	#4
neilvosko Lieutenant Colonel 89 Rep 1,529 Posts Drives: 335i e92 FBO Join Date: Dec 2011 Location: miami iTrader: (19)	or vibrant resonators
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08-31-2012, 12:52 PM	#5
elim11 Major 424 Rep 1,325 Posts Drives: e90m3 Join Date: Apr 2008 Location: irvine/sf iTrader: (13)	How about a hemholtz resonator? That seems like the only real way to reduce drone. Vibrant resonators will help with rasp. __________________
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08-31-2012, 12:55 PM	#7
dadgar Private First Class 14 Rep 130 Posts Drives: E92 M3 Join Date: May 2010 Location: Boston, MA iTrader: (3)	Any one have a link to a good set of HFC's?
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08-31-2012, 01:48 PM	#8
cstmx_ryder Colonel 164 Rep 2,875 Posts Drives: A metal box with a roundel Join Date: Jul 2007 Location: Portland, OR iTrader: (2)	Don't weld ANYTHING to the Vanguard......Please. Just cruise at a higher RPM (about 2-3 hundred more than you normally would), and the drone will be virtually unnoticed..... I have the same setup..... __________________ '08 AW E90 335i PROcede V5 \| BMS DCI \| RR DPs \| ETS FMIC \| FORGE DVs \| Stett CP \| Vanguard \| PSS10
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08-31-2012, 08:01 PM	#10
dadgar Private First Class 14 Rep 130 Posts Drives: E92 M3 Join Date: May 2010 Location: Boston, MA iTrader: (3)	Welding the exhaust flap shouldn't be a big deal. If I decide it is better stock, by unplugging the vacuum tube it essentially will be. My main question really is if there is a cover on one of the pipes will the H pipe allow pressure equalization. I dont want it to cause any problems.
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