Soundproofing 93 Defender?

Nera Donna · 23rd July 2012, 05:46 PM

Dynamat Xtream and Dynamat Superlite are a self-adhesive, ‘tar like’ substance with an aluminum foil backing.
Dynaliner and Dynapad are a ‘closed cell’ like material.
The company recommends to install the Dynamat first and then if you so wish, the Dynaliner or pad over that.
Their web site product information is more car orientated, nothing really on 4wd applications. So I E-mailed the parent company with a few questions regarding my application. They we’re quite helpful.
There are a heap of different products on the market, some are cheaper and some are more expensive.
Personal choice really.
I bought my materials on eBay through a couple of different vendors in the states.
Watch the shipping costs! Work out the total cost before choosing, even with the Aussie vendors. The shipping costs can almost be as expensive as the materials themselves with the overseas vendors.
As zwitter said the ‘tar like substance’ lowers the resonating noise transmitted through the metal. It doesn’t actually lower the sound level (for want for a better word). Hard to understand I know but you can get your head around it eventually. The ‘closed cell’ like material will lessen the sound or noise level inside the vehicle. Hence the recommendation to use the two products together.
Hope this helps some. I know I had a hell of a time working it all out when I did mine.
Cheers

**jerryd** · 23rd July 2012, 05:51 PM

I recently carried out lots of work to my seatbox and surrounding areas. The main objective was additional storage and secondly soundproofing.

Both have turned out far better than I expected and total cost was under $100.00

I'm going to do doors, roof etc. as I get to them

I got my inspiration from this video

[ame=http://www.youtube.com/watch?v=oS9G7bHH6Tk&feature=relmfu]4.3 Chevy V6 in a Series Rover - Part 10 - YouTube[/ame]

**GyroLandy** · 23rd July 2012, 09:28 PM

I'm busy with soundproofing mine nowm Double layer Dynamat on floor and firewall with 8mm thermotec closed cell foam with marine carpet on top. Also dit inside of doors.

**Albert** · 27th July 2012, 03:11 AM

One of the biggest improvments on mine was the bonnet.
Before that I had lined with closed cell most of the cab, even the brake pedal box and heater housing.
After reading some posts a few months ago I wound out the fuel screw on the Isuzu, that seemed to make the moter quieter as well.

**Jode** · 28th July 2012, 03:35 AM

The trick is to introduce a dense material between the noise source and you and your family. The products described above sound (sorry...) great.

When trying to reduce noise coming into our 110, we fit dense matts under the carpets, and also pulled the head liner off and glued some fairly dense acoustic insulation batts to the underside of the roof. I suspect that the products above would provide better sound insulation than the batts that we used, but as we had them left over from a fan duct installation in our house we used them.

**Mudnut** · 29th July 2012, 08:49 PM

Hi Fender,

I have a related post in the "Projects and Tutorials" listed as "Sound Insulation for Defender" There are some photo's, and related photo's from others. It has made a difference for my Defender in noise, but more importantly in the heat transmitted through the transmission tunnel, and surrounds. Makes a big difference up north

A time consuming project, but well worth the time and effort.

Cheers,
Ken

**Michael2** · 30th July 2012, 05:59 AM

I've just ordered the Wright Off Road / Exmoor Trim acoustic mat system for the seat box, front floor and firewall - after 15 years of wanting to get it.

I've also ordered a sound meter.

I hope to conduct some before / after noise level tests and also see how extra under bonnet insulation or panel deadening contributes to sound reduction.

Hopefully I can contribute to this discussion with some numbers in a couple of weeks.

**flagg** · 30th July 2012, 05:27 PM

Originally Posted by Lotz-A-Landies

Headphones and an intercom system!

haha I actually do this for long trips as I've often got these in the 110 anyway.

David Clark Company H10-13X

**MLD** · 31st July 2012, 08:10 PM

my 2 cents worth based on installing insulation over the weekend

http://www.aulro.com/afvb/projects-t...-defender.html

cheers MLD

**Dougal** · 1st August 2012, 07:22 AM

EVA foam was the product I couldn't remember earlier. It's a closed cell polyethelene foam which is light, waterproof and works excellently as a decoupling layer between your deadeners and your interior trim.

Before I found the EVA foam I stripped out my work car (incl dash) and did two layers of roof-flashing tape (modified bitumen/butyl with foil backing) right over the firewall.
It went from being very noisey to being able to hear rain hitting the windshield.

I have since done the back of the car with the flashing tape and EVA foam cover. The result is better than the front, particularly on road noise. This means at some stage I need to pull the seats and carpet again to put a layer of EVA foam over the firewall, floor and tunnel.

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