Click to go to Forum Home Click to go to maXbimmer Home

Go Back   maXbimmer Forums > maXimum Tech > Audio/Sound
User Name

Welcome to!

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Thread Tools Rate Thread Display Modes
Old 10-15-2002, 11:27 PM   #1
5th Gear Member
e46it's Avatar
Join Date: Oct 2002
Location: Richmond Hill
Posts: 1,082
Sound Proofing your Bimmer


The standard soundproofing in the car is pretty good but add something like a sub-woofer or a sports exhaust and things start to rattle and vibrate like crazy. I added Dynamat to the boot of mine purely as my exhaust seemed to reverberate through the boot and it got amplified as it did and I happened to be able to get hold of some off a friend cheaply. See the end section for an independnt review done by Fast Car as there are loads of pruducts available!

The thing to note with dynamat is that you dont need to cover every single inch of space, it is the large flat panels that need damping the most, not tiny little section of metal. For example if you shake a large flat piece of plywood by the edges it makes a Rolf Harris inspired sound, if you do this with a small piece you get less sound purely as it is the large surfaces that flex not the ones.

Preperation is important. You need to make sure all the surfaces are clean, non greasy and dry. The best way to do this is to wipe all surfaces with something like white spirit as this dissovles all the crap that gets in there. Dynamat is most plyable when it is warm, people I know dynamat their cars use a hair dryer but personally I just warm up each section by putting it into a warm oven keeping a careful eye on it, it needs to be warm not hot!. The best tool to use when actually covering is a wallpaper roller as the plastic roller ensures you put even pressure over the entire area and helps you avoid air bubbles.

I discovered that it is the spare wheel well that due to its proximity to the exhaust transmits quite a bit of noise, notably the floor of it as it is made of much thinner metal than the sides, so put a few large section in here and also round the sides but you dont need to use a much here due to the metal being much thicker.

Once the boot floor is done you need to concentrate on the boot lid. For this you need to take out the toolkit and the carpet. The clips that hold the carpet in place are removed by partly levering them out with a blunt knife or wide-bladed screwdriver and then using a much thinner screwdriver once it is partly out and inserting this into the actual split between the retaining arms and pulling it forward as this causes the arms to contract.

The toolkit's plastic hinge is screwed into the boot metal, you need to prise off the plastic covers that are on top of the screws and undo them. The flexible plastic "stop" is removed by simply rotating it 90 degrees and releasing it.

Once the carpet is removed you will see the boot lid due to its construction wont allow for a huge amount of sound proofing. What I did was to cover all four of the oval shaped cut outs, the raised metal section to the right of these and the actualy boot lid top skin, you can only do this in a small section by touch not by sight. I also did all the metal connecting strips where the carpet is secured.

The next area to do is the rear parcel shelf under the grey plastic cover that incorporates the speaker grilles and the actual metal of the back seat. I'll keep you posted when I do these!
Attached Images
File Type: jpg dynamat2.jpg (74.9 KB, 407 views)

2004 BMW 325i Touring SGM
2005 Suzuki GSXR 1000|1992 JDM Civic SiR RHD Black
2000 BMW M5 Avus Blue (GONE)
2002 BMW 325i Touring TVM (GONE)
1994 BMW 325i Saloon Black (GONE)
e46it is offline   Reply With Quote
Old 10-16-2002, 12:14 PM   #2
Gets Blown Daily
djcontra's Avatar
Join Date: Jan 2002
Location: Scarghetto
Posts: 6,129
Send a message via ICQ to djcontra Send a message via MSN to djcontra Send a message via Yahoo to djcontra
lookin' forward to an update or review because i need to do this as well sometime in the future

'94 Supercharged E36 325is (150,000 original km's)
-Vortech V9 G-Trim @ ~10psi w/ BOV
-Shortstack headers
-Vortech RRFPR
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)

djcontra is offline   Reply With Quote

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 On

Forum Jump

All times are GMT -4. The time now is 12:03 AM.

Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Maxbimmer Copyright 2001 - 2018