Thread: Soundproofing 93 Defender?

Leave your old girl at home.

I've been looking at the same thing for a little while. Noise doesn't worry me normally but gets a bit tiresome for the family.

Have a read of this guys site: Sound Deadener Showdown - Your Source for Sound Deadening Products and Information from what I can gather you need 3 things - vibration dampening (stop the panels resonating), a sound barrier and a isolation layer for the barrier. Not sure what to get for vibration dampening yet, but I'm thinking for the other 2 a layer of 3 - 5mm closed cell foam with a layer of Jaycar AX3680 on top of that. Heavy Duty Sound Barrier Damping Material - Improved - Jaycar Electronics

I'm guessing that it wouldn't be as good as Dynamat or Noisekiller premoulded stuff but this will be cheaper, if a lot more effort. Good excuse for

Easy? Relatively, but very time consuming.
Cheap? Not really. But that will all depend on where you get your materials from.
I went down the Dynamat route. Dynamat Superlite on the floor and the rear quarter panels.
Laid ½” Dynaliner over the quarter panel sections and carpet on top of that.
I’ve only completed the cargo area so far. Hopefully get some time to complete the rest of the vehicle sometime soon?
Result: Not bad. It’s not Mercedes or BMW quite by any stretch of the imagination, but I personally think it’s worth the effort.

Is Dynamat a kind of closed cell foam with a glued aluminum foil?

Originally Posted by Nera Donna

Easy? Relatively, but very time consuming.
Cheap? Not really. But that will all depend on where you get your materials from.
I went down the Dynamat route. Dynamat Superlite on the floor and the rear quarter panels.
Laid ½” Dynaliner over the quarter panel sections and carpet on top of that.
I’ve only completed the cargo area so far. Hopefully get some time to complete the rest of the vehicle sometime soon?
Result: Not bad. It’s not Mercedes or BMW quite by any stretch of the imagination, but I personally think it’s worth the effort.

Originally Posted by lebanon

Is Dynamat a kind of closed cell foam with a glued aluminum foil?

No. Dynamat Xtreme is about 1.5mm thick Butyl rubber with a heavy aluminum foil backing. (all up about 1.6mm thick). Very effective sound dampener/deadener. Also quite popular with the young blokes to line their 1000 dB sound powered Commodores.

Dynamat makes other products as well.

Deano

OK generally sound deadening products do not get rid of the sound, they just lower its frequency. Ideally you need to physically isolate the inner cab from the body, not practical.

But you can do quite a bit to make it much better.

The best products are mass loaded vinyl products. The seat box cover in Defender is made of this. I think they use barium? It is heavy. And not cheap.

I bought about 50 self adhesive pads like the ones at supa cheap from Sika and covered the firewall, seatbox, seatbox lids, transmission tunnel, rear and front floor. Made a difference in lowering the resonant frequency of panels so no audible drumming and a bit quieter. But I wanted more.

I bought product from a company in western sydney (girraween?) who did the army defenders. It is designed to go under floor boards in apartments and consists of a thick sheet of barium loaded vinyl and a wavey rubber. It is about12mm thick. I laid this on floors up firewall, transmission tunnel, seatboxes, back of cab (130) stuck it to inside of the roof metal.
I still intend to get more sticky sheets and put them inside the door skins, behind dash, inside the air flaps and under the cubby box.
if you want to get technical you can use a dB meter (can get a phone app) and seriously technical with a spectrum analyser!

I spent $1000 and can hold a conversation at110kph

I also changed TC gears for 1:2. And installed a 12" sub and stereo

The only noise i hear now I think is from rear diff and it is transmitted through the chassis. Working on that.

James

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Turn up the radio

Headphones and an intercom system!