Custom DIYs to reduce drone? - BMW 3-Series (E90 E92) Forum

mase · 07-11-2011, 08:48 PM

So I'm curious what things you guys have done to reduce drone on an exhaust. I'm not referring to adding resonators on the midpipe (though feedback on that would be great). Some people say resonators only remove the high frequency noise.

I mean like adding rubber dampeners at some point along the piping or on the muffler. Or maybe sticking a tennis ball at certain spot. Wrapping the piping in something. Dynamatting?

Anyone have any success with any sort of noise reduction?

Syndicategt · 07-11-2011, 08:53 PM

Down shift

Rotorocious · 07-11-2011, 09:01 PM

Tennis ball? lol

mase · 07-11-2011, 09:06 PM

cruise in 4/5th gear on commutes?! haha, yes that's a solution but there are more hands on things that could be done..

I'm considering maybe having someone rev to 2200 rpm while my car is on jackstands, and I could feel which parts are making the most noise/vibrating the most.

Someone get a rubber block to push up against that area and the chassis. Something like this but bigger. http://www.amazon.com/Mr-Gasket-1284...0436138&sr=8-3

mase · 07-11-2011, 09:07 PM

Quote:

Originally Posted by Rotorocious

Tennis ball? lol

haha ghetto is fine with me, as long as it works. you can start with a ghetto solution and then try and make it pretty.

mase · 07-12-2011, 07:18 PM

nobody? everyone just lives with the drone?

ttbmer · 07-12-2011, 07:28 PM

I love the sound of AMS CBE but the drone was killing me so I sold it. Now I have AE CBE with 0 drone which I love but I'm not really feeling the sound exhaust at WOT but then again no drone at all

Bullet · 07-12-2011, 08:11 PM

Turn up the music

Syndicategt · 07-12-2011, 10:13 PM

Quote:

Originally Posted by mase

nobody? everyone just lives with the drone?

Went with AE's exhaust so I don't have to worry about drone

ttbmer · 07-12-2011, 10:51 PM

Quote:

Originally Posted by Syndicategt

Quote:

Originally Posted by mase

nobody? everyone just lives with the drone?

Went with AE's exhaust so I don't have to worry about drone

That ^^ me too!! But not sure if I like the sound tho. I had it for 2 day so may be I need more time

elim11 · 07-12-2011, 10:51 PM

There was a member on here that welded the stock rubber exhaust dampener to their aftermarket exhaust. He said that that it didn't help with the drone and maybe slightly helped with rasp.
To use a rubber dampener to help with drone, it has to be specifically engineered to offset the drone (frequency) of the exhaust setup. I would love to have a "bolt" on solution to the drone without changing the tone of the exhaust.

dsbj · 07-13-2011, 02:18 AM

I've thought about doing this and read up on it but haven't taken action. I think a bolt on version like the one picture below would make the most sense. You could keep moving it through trial and error as I think you need to have the car under load. Btw, I should mention the 335 already has one damper installed. I removed it to see if my minimal drone would reduce. It didn't, but that doesn't mean adding another in a different location won't fix the issue.

I should note that I have an aftermarket exhaust and it's an AT. Read: drone around 2k.

Read more here:
http://www.mercurymarauder.net/forum...ad.php?t=43329

FrankiE90 · 07-13-2011, 02:56 AM

Tee212 · 07-13-2011, 02:59 AM

take the good with the bad, you want noise now deal with it! no way around it lol

tofu- · 07-13-2011, 05:49 AM

Quote:

Originally Posted by dsbj

I've thought about doing this and read up on it but haven't taken action. I think a bolt on version like the one picture below would make the most sense. You could keep moving it through trial and error as I think you need to have the car under load. Btw, I should mention the 335 already has one damper installed. I removed it to see if my minimal drone would reduce. It didn't, but that doesn't mean adding another in a different location won't fix the issue.

I should note that I have an aftermarket exhaust and it's an AT. Read: drone around 2k.

Read more here:
http://www.mercurymarauder.net/forum...ad.php?t=43329

Sounds like a real pain to trial and error. Why not place a few along the pipe every couple feet?

mase · 07-13-2011, 08:55 PM

Quote:

Originally Posted by dsbj

I've thought about doing this and read up on it but haven't taken action. I think a bolt on version like the one picture below would make the most sense. You could keep moving it through trial and error as I think you need to have the car under load. Btw, I should mention the 335 already has one damper installed. I removed it to see if my minimal drone would reduce. It didn't, but that doesn't mean adding another in a different location won't fix the issue.

I should note that I have an aftermarket exhaust and it's an AT. Read: drone around 2k.

Read more here:
http://www.mercurymarauder.net/forum...ad.php?t=43329

that actually looks like it could work.. I can't find a picture of the actual part.. it looks like it's a ring clamp hooked up to a weight? good thought there!

07-11-2011, 08:48 PM	#1
mase Banned Drives: 335i Join Date: Nov 2009 Location: NYC Posts: 446 iTrader: (27)	Custom DIYs to reduce drone? So I'm curious what things you guys have done to reduce drone on an exhaust. I'm not referring to adding resonators on the midpipe (though feedback on that would be great). Some people say resonators only remove the high frequency noise. I mean like adding rubber dampeners at some point along the piping or on the muffler. Or maybe sticking a tennis ball at certain spot. Wrapping the piping in something. Dynamatting? Anyone have any success with any sort of noise reduction?
	Tweet

07-11-2011, 08:53 PM	#2
Syndicategt Brigadier General Drives: 335i Join Date: Sep 2009 Location: Nor Cal Posts: 3,738 iTrader: (11)	Down shift __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /

07-12-2011, 07:28 PM	#7
ttbmer Lieutenant Colonel Drives: space gray on black 07 335i Join Date: Jul 2010 Location: las Vegas nv Posts: 1,769 iTrader: (14)	I love the sound of AMS CBE but the drone was killing me so I sold it. Now I have AE CBE with 0 drone which I love but I'm not really feeling the sound exhaust at WOT but then again no drone at all __________________ PROCEDE, PWM Vishnu Kit, AR catless DP, BMS DCI, Helix IC, P3 gauge, 25% window tint, mattblack window trim, mattblack roof wrapped. Vorstainer CSL trunk, CF wrapped interior, 18'' Forgestar F14 Matt black, quaife LSD, M3 suspension bits, Mtech front bumper). http://www.youtube.com/watch?v=b8JIB8C8HDA

07-12-2011, 08:11 PM	#8
Bullet Major Drives: 09 e92 335i Join Date: Apr 2009 Location: So cal Posts: 1,001 iTrader: (6)	Turn up the music __________________ Cobb // Helix // BMS // E9X Picture game: 1

07-13-2011, 02:56 AM	#13
FrankiE90 Major General Drives: 2011 E90 Space Gray™ Join Date: Feb 2008 Location: Pasadena, Ca Posts: 8,503 iTrader: (10)	__________________ FrankiE90 AKA:.[The TANK] *CLICK THE SIG 2011 335 E90 MTECH 6MT • KW V3 • INJEN Intake • Berk 4" DP • Vanguard V2 exhaust • Procede V5 • Stoptech BBK • RPI Scoops • Karbonwerk CSL Trunk • LUX H8 • 19" BBS LM • 18" BBS GT4

07-11-2011, 09:01 PM	#3
Rotorocious Major Drives: 335i Join Date: May 2010 Location: Florida Posts: 1,281 iTrader: (3)	Tennis ball? lol

07-11-2011, 09:06 PM	#4
mase Banned Drives: 335i Join Date: Nov 2009 Location: NYC Posts: 446 iTrader: (27)	cruise in 4/5th gear on commutes?! haha, yes that's a solution but there are more hands on things that could be done.. I'm considering maybe having someone rev to 2200 rpm while my car is on jackstands, and I could feel which parts are making the most noise/vibrating the most. Someone get a rubber block to push up against that area and the chassis. Something like this but bigger. http://www.amazon.com/Mr-Gasket-1284...0436138&sr=8-3

07-12-2011, 07:18 PM	#6
mase Banned Drives: 335i Join Date: Nov 2009 Location: NYC Posts: 446 iTrader: (27)	nobody? everyone just lives with the drone?

07-12-2011, 10:51 PM	#11
elim11 Lieutenant Drives: e90m3 Join Date: Apr 2008 Location: irvine/sf Posts: 567 iTrader: (9)	There was a member on here that welded the stock rubber exhaust dampener to their aftermarket exhaust. He said that that it didn't help with the drone and maybe slightly helped with rasp. To use a rubber dampener to help with drone, it has to be specifically engineered to offset the drone (frequency) of the exhaust setup. I would love to have a "bolt" on solution to the drone without changing the tone of the exhaust.

07-13-2011, 02:18 AM	#12
dsbj I sweat pheromones Drives: e92 335i, retired SLK55 Join Date: Jul 2009 Location: NorCal Posts: 1,876 iTrader: (21)	I've thought about doing this and read up on it but haven't taken action. I think a bolt on version like the one picture below would make the most sense. You could keep moving it through trial and error as I think you need to have the car under load. Btw, I should mention the 335 already has one damper installed. I removed it to see if my minimal drone would reduce. It didn't, but that doesn't mean adding another in a different location won't fix the issue. I should note that I have an aftermarket exhaust and it's an AT. Read: drone around 2k. Read more here: http://www.mercurymarauder.net/forum...ad.php?t=43329

07-13-2011, 02:59 AM	#14
Tee212 Banned Drives: yes Join Date: Oct 2008 Location: Riverside Posts: 4,549 iTrader: (9) Garage List 2010 335 [4.83]	take the good with the bad, you want noise now deal with it! no way around it lol

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search