BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Coding / ConnectedDrive / Audio-Video / Electronics / Bluetooth / I-Drive & Nav
 
OneEighty
Post Reply
 
Thread Tools Search this Thread
      07-23-2009, 04:55 AM   #1
Kitsune
BMW Freshman
 
Drives: (Soon) '10 M3 E92
Join Date: Jun 2009
Location: Alabama

Posts: 82
iTrader: (0)

Dynamant Weight and Performance

I am interested, or at least currently researching, the use of dynamat in the E90 to both reduce road noise and improve sound quality. I'm not sure what placement and where would be best, but say that it was a near full install. About how much weight would that add? Has anyone worked with this?

This car will probably be 95% street and 5% track.

Edit: Dynamat Extreme is what I was considering, due to decreased weight and, well, obviously increased performance.
Kitsune is offline   United_States
0
Reply With Quote
      07-23-2009, 06:42 AM   #2
URBAN LEGEND
Champ
 
URBAN LEGEND's Avatar
 
Drives: '13 M5, '13 ZL1
Join Date: Feb 2009
Location: Houston

Posts: 2,064
iTrader: (0)

I would wait until you get the car. There is really no road noise inside the car.
__________________
2013 M5-Silverstone
2013 ZL1-Summit White
URBAN LEGEND is offline   United_States
0
Reply With Quote
      07-23-2009, 07:14 AM   #3
JuniorDee
Captain
 
JuniorDee's Avatar
 
Drives: the speed limit
Join Date: Apr 2007
Location: the land of brat and brotchen

Posts: 610
iTrader: (1)

Quote:
Originally Posted by URBAN LEGEND View Post
I would wait until you get the car. There is really no road noise inside the car.

I agree, even with an x-pipe its not that loud.
__________________
EDC.....viagra for your car
JuniorDee is offline  
0
Reply With Quote
      07-23-2009, 08:16 PM   #4
J08M3
Major General
 
J08M3's Avatar
 
Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
iTrader: (8)

In my opinion part of the fun of the M3 is the decreased sound deadening materials you find in more luxury type cars. This is supposed to be a sports car you want to hear all the noises.
__________________
J08M3 is offline   United_States
0
Reply With Quote
      07-23-2009, 08:32 PM   #5
Kitsune
BMW Freshman
 
Drives: (Soon) '10 M3 E92
Join Date: Jun 2009
Location: Alabama

Posts: 82
iTrader: (0)

Quote:
Originally Posted by J08M3 View Post
In my opinion part of the fun of the M3 is the decreased sound deadening materials you find in more luxury type cars. This is supposed to be a sports car you want to hear all the noises.
True. I was thinking more about increasing the quality of sound inside than listening to what is outside. The thing is, unless I completely surround the engine and forward compartment of the car in the stuff, I don't think it will effect that particular portion of the sound. The exhaust, however, yes it might.

And I just realized I spelled Dynamat wrong... somehow.
Kitsune is offline   United_States
0
Reply With Quote
      07-24-2009, 05:17 AM   #6
808MGuy
Colonel
 
808MGuy's Avatar
 
Drives: 2009 E90 M3
Join Date: Jun 2008
Location: Oahu, Hawaii

Posts: 2,282
iTrader: (3)

Quote:
Originally Posted by Kitsune View Post
True. I was thinking more about increasing the quality of sound inside than listening to what is outside. The thing is, unless I completely surround the engine and forward compartment of the car in the stuff, I don't think it will effect that particular portion of the sound. The exhaust, however, yes it might.

And I just realized I spelled Dynamat wrong... somehow.
If you do a full install meaning floor, roof, doors, trunk, and firewall you could easily go through 4-5 rolls (approx 40 sq ft per roll). In my last car, I used 1 full roll just on the two front doors. I recall that each of those rolls weigh about 40-50 lbs so you're adding around 200 lbs. IMO, I wouldn't use dynamat. Too expensive and hard to work with. There are other brands out there that do the job better and are easier to work with like RAAMat or Cascade.
__________________
09 E90 M3 - Interlagos Blue / Black Novillo / Sycamore Anthracite / Eibach / HRE

808MGuy is offline  
0
Reply With Quote
      07-24-2009, 06:37 AM   #7
bigjae1976
That's what she said...
 
bigjae1976's Avatar
 
Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Milwaukee, WI

Posts: 5,467
iTrader: (12)

Garage List
2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
I would do the areas near the speakers, the doors in this case. That will yield the biggest results.

Rear quarter panels and the rear deck are common areas for rattles. And of course, the trunk lid.

The floor & roof would be a waste since the floor in a BMW is very well damped abd the CF roof should be VERY stiff. You'll probably have a much larger issue of too much damping, especially in the trunk.
__________________


Sponsored by Momentum BMW #593...We Bleed BMW BLUE!
bigjae1976 is offline  
0
Reply With Quote
      12-06-2009, 11:54 AM   #8
DiamondGCoupe
Private First Class
 
Drives: 2010 E92 M3 Coupe
Join Date: Nov 2009
Location: Dallas, TX

Posts: 152
iTrader: (0)

What about the wheel wells, there has to be some way to reduct tire/road noise aside from purchasing higher profile tires. Albeit much quitter than my previous car, there is still room for improvement. It's no 7-series but I shouldn't have to keep the windows down and blast the music just to avoid hearing the road.
__________________
2010 E92 M3 - Alpine White Mine on 11/2/09 CarDomain
2008 G37S Coupe - Sold
DiamondGCoupe is offline   United_States
0
Reply With Quote
      12-06-2009, 01:46 PM   #9
Eliminator
First Lieutenant
 
Eliminator's Avatar
 
Drives: 2008 M3 SSII 6M, '87 911
Join Date: Mar 2008
Location: Michigan

Posts: 311
iTrader: (0)

I work in the business so I may be able to help. The weight, depending on thickness, is about 1.5lbs./sq ft. We also have light weight dampers, which are effective and less dense... using glass beeds. We manufacture and sell to the distributors private label. It is a butyl compound with aluminum foil. Excellent vibration damper. Keeps panels from vibrating like speakers. These are not insulators. Insulators are like pillows, padding and have to be thick and fluffy. They absorb air borne noise from inside the cabin. Like people talking... so better articulating index is the result. Back to damping. Dampers stop vibrations. So sounds that light up - vibrate - the panels will lose their energy quickly. ie. engine noise - 4 cylinders are notorious at 250 Hz - don't know V8's, road bumps and roads noise will not resonate the panel. Dampers are very effective - most common applications - on Doors, Wheel house, Front of Dash, Floors, Roof - great for rain - and last, rear quarters. Hot Rodders also use them for heat insulation. Ok, it works. Always on the inside of the car though. Can sustain only 250F continous. Aftermarket folks never place properly, so what they do is called wallpapering. Just cover everything. We use laser vibrometer and Head Acoustic recording devices to determine the natural resonant frequency of the panel in question and which area "lights up" the most. These pads are very effective with only 1/2 square foot per door. Ok, here, take a symbol hit it, then put a 1" square of butyl damper on the symbol anywhere, hit it again. Huge difference. Don't do the floor at all. They have asphaltic dampers already there. Actually, if you want to do wonders, take out the less effective asphalt by scraping it off, and put butyl dampers 3/4 the size of the asphalt. Then you'll lose weight and gain acoustic performance on the floor. Assuming the M3 has asphalt like the reg 3.
I wouldn't dampen the Front of dash. I like the engine noise. Actually i'd remove it all. Save it for the Lincolns!
__________________
SIGPIC][/SIGPIC] 2008 M3 SSII 6MT, EU Bumper, Matte Black Kidneys, AA Pulley, 12/10 RE Spacers, MS Filter
Eliminator is offline   United_States
0
Reply With Quote
      12-07-2009, 01:43 AM   #10
quality_sound
8 tracks of madness
 
Drives: Slowly
Join Date: Jun 2009
Location: At home

Posts: 2,731
iTrader: (1)

Quote:
Originally Posted by DiamondGCoupe View Post
What about the wheel wells, there has to be some way to reduct tire/road noise aside from purchasing higher profile tires. Albeit much quitter than my previous car, there is still room for improvement. It's no 7-series but I shouldn't have to keep the windows down and blast the music just to avoid hearing the road.
Spray on undercoating works well for that. Dynamat has a spray that I've used that works weel but it didn't strike me as anything other than a normal undercoating.
quality_sound is offline   United_States
0
Reply With Quote
      12-07-2009, 09:13 AM   #11
DiamondGCoupe
Private First Class
 
Drives: 2010 E92 M3 Coupe
Join Date: Nov 2009
Location: Dallas, TX

Posts: 152
iTrader: (0)

What is a good quality undercoat spray I can buy?
__________________
2010 E92 M3 - Alpine White Mine on 11/2/09 CarDomain
2008 G37S Coupe - Sold
DiamondGCoupe is offline   United_States
0
Reply With Quote
      12-07-2009, 11:31 AM   #12
quality_sound
8 tracks of madness
 
Drives: Slowly
Join Date: Jun 2009
Location: At home

Posts: 2,731
iTrader: (1)

They're all pretty much the same. I HIGHLY doubt you'll hear a difference from one to another. I will say this though, they work MUCH better than I thought they would and eliminate a ton of road noise.
quality_sound is offline   United_States
0
Reply With Quote
      12-07-2009, 12:08 PM   #13
DiamondGCoupe
Private First Class
 
Drives: 2010 E92 M3 Coupe
Join Date: Nov 2009
Location: Dallas, TX

Posts: 152
iTrader: (0)

Something like this:

http://www.dkhardware.com/product.aspx?product_ID=26559

I just want quality in a sense it lasts. Something is better than nothing and I just got the car so don't want to buy higher-profile tires now.

Also, does smoething like this require an adhesive spray before use?
__________________
2010 E92 M3 - Alpine White Mine on 11/2/09 CarDomain
2008 G37S Coupe - Sold

Last edited by DiamondGCoupe; 12-07-2009 at 12:29 PM.
DiamondGCoupe is offline   United_States
0
Reply With Quote
      12-07-2009, 01:47 PM   #14
quality_sound
8 tracks of madness
 
Drives: Slowly
Join Date: Jun 2009
Location: At home

Posts: 2,731
iTrader: (1)

Just hit up a local auto parts store and they'll have something. But they're all formulated with the adhesive so you simply clean the area, mask it off, spray it and let it dry.
quality_sound is offline   United_States
0
Reply With Quote
      12-07-2009, 03:10 PM   #15
Synter
Private First Class
 
Synter's Avatar
 
Drives: 2008 E92 M3
Join Date: Sep 2009
Location: Destin, Flordia

Posts: 164
iTrader: (0)

Send a message via MSN to Synter
If you want a superior quality and look's go with Line-X. Its a truck bed liner, it has numerous applications and it works fabulous. I had it sprayed in my trunk of my Evolution MR to reduce exterior noise and rattle from four twelve inch subwoofers. I've read numerous articles on this product, one was the pentagon uses it to line their walls due to it's sound deading properties. I was going to use dynamat but after reccomendations from other people that have used it I was sold.

Heres a good link to get you reading.

http://www2.line-x.com/ns/news.html?NewsID=191
__________________
2008 E92 M3 Melbourne Red, 20" Iconz 880Z, Gintani race exhaust, HID angel eyes, 6k Interior light kit, Vorsteiner VRS lip
Car for sale thread

http://www.m3post.com/forums/showthread.php?t=577829
Synter is offline   United_States
0
Reply With Quote
      12-08-2009, 11:41 AM   #16
DiamondGCoupe
Private First Class
 
Drives: 2010 E92 M3 Coupe
Join Date: Nov 2009
Location: Dallas, TX

Posts: 152
iTrader: (0)

I called a local dealer, they said they would have to take a look at the wheel wells but gave me an estimate of about $200. I can do it myself for much cheaper but this will probably last longer. Wonder if it dampens the sound the same a foam would? I think for $200 I'd give it a shot can't make it worse.
__________________
2010 E92 M3 - Alpine White Mine on 11/2/09 CarDomain
2008 G37S Coupe - Sold
DiamondGCoupe is offline   United_States
0
Reply With Quote
      12-08-2009, 11:46 AM   #17
quality_sound
8 tracks of madness
 
Drives: Slowly
Join Date: Jun 2009
Location: At home

Posts: 2,731
iTrader: (1)

Foam won't do squat but WILL soak up a crap-ton of water and then get all nice and moldy. Just use the undercoating.
quality_sound is offline   United_States
0
Reply With Quote
      12-08-2009, 05:30 PM   #18
roller
Private First Class
 
roller's Avatar
 
Drives: E92
Join Date: Jun 2009
Location: OC, CA

Posts: 164
iTrader: (0)

Foam is only good if you want to stop a squeak or rattle between two surfaces that come in contact. Otherwise they really don't do much.
roller is offline  
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 04:02 PM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST