Sound Insulation

[merckx]

I'm going to insulate the rear end of the car, boot area, wheel arches and maybe under the carpet in the rest of the car.

 

I've heard of Dynamat before but after doing a search I've found some people use Barrier Mat and was pointed to this link.

 

http://www.noisekiller.co.uk/soundproofing.htm

 

 

Which is best stuff to use, Dynamat or Barrier Mat?

 

If I go for the Barrier Mat can you buy it directly from the place above?

 

Thanks:)

[SKI]

Barrier mat all over the boot floor, over the wheel arches. Layer of dead mat under the back seats, and a precisely cut sheet of dead mat under the hatch carpet. This will give you a 50-75% reduction in sound. Dynamat is crap stay away from it plus it costs a fortune.

 

It took me a whole day and the barrier kit costs about £200. Dont do under the carpet or the engine bulkhead there's plenty of inuslation there already, so you won't improve on what Toyota has done already. I have a UK spec so it might be different on the Jap. Downside is you will add about 20Kg to your car.

 

Unless my windows are down I cant hear my full decat exhaust

 

Be careful of which tyres you use some are classic noise makers.

 

Most of the noise comes in through the panels either side of the rear seats, you wil also notice how much better your ICE sounds, put the extra barrier mat on the inside of the plastic panals to stop rattles, good luck

[SKI]

Check the ICE section this topic has been covered before

[merckx]

Thanks Ski much appreciated:)

 

The kit you bought, was it a custom fit for the Supra or did you just get the pieces to cut yourself?

[Matt Harwood]

If you're comparing Barrier Mat to standard Dynamat Original, I agree, but compare Barrier mat to Dynamat Extreme, and the Dynamat wins hands down. *

This is assuming you're using Dynamat as it is intended. As a barrier/anti resonance product. - It's a common misconception that Dynamat and associated products, (Brown Bread, Barrier mat etc), are sound proofers. They're not. They are meant to reduce panel resonance by loading the panel. You can do the same with lead flashing, but bugger me, that puts some weight on the car!

 

Apart from the 'Dynamat is crap' comment, I totally agree with everything that SKI said.

 

 

 

 

* I know this because a few weeks back, we had a customer bring in a load of his own audio equipment he bought from the internet, and asked us to install for him. Amongst that, was Barrier Mat. Dynamat have a demo display comprising of two bells, one normal and one with a small piece of Dynamat attached. We put an equivilent sized peice of Dynamat onto the empty bell, and trust me, there's a world of difference. - It's still on display in our shop today as a demo of cheaper options

PS, how much is Barrier Mat?

[SKI]

I think noisekiller do a Supra kit, but the guy (who incidentally was very helpful) suggested a custom cut was always better.

 

Matt the barrier-mat you used, was it like a sticky yellow polymer with a metalic coating? I found this to be excellent. The dead-mat material is like the honeycomb they use in recording studios. It's basically two thin pieces of absorbant polymer speperated by a rubber web, that's about 1/2 an inch thick, it's quite easy to cut and you can shape it underneath the hatch carpet right up to the back seat, and under the back seats. The difference was impressive. Luckily not quite as heavy as lead flashing LOL.

 

Matt if you say Dynamat extreme is even better again, that would certainly be worth a look.

 

The whole lots cost me in the region of £150-200 I bought 1.5m2 of barrier mat and the same of dead-mat, there may be a better combination of products but I was very pleased with the result, it took the best part of a whole day to complete though cos all your panals, seats etc etc have to come out.

[SatSport]

this was posted in another forum, may be of interest........

 

"Tyre Noise Reduction....

Tyre noise, thats a major problem in a supra, however you can cut it by about 50% with a few hours work. Here is how. Buy yourself a load of deadmat (not dynamat) try the heavyweight stuff from B J Auto Acoustics (yellow with a silver top). You will need to remove the contents of the boot, and the side panels, and the rear panels either side of the back seat. This is the area your getting most of the problem from. You need to apply a layer of this stuff right over the boot floor, shaping it as you go over the various bits. on the sides of the boot you can deaden the inside of the back part of the quarter panel. Also stuffing this rear part with foam afterwards is good also. As for the quarter panels either side of the rear seat, this you are best starting with about 3 layers of the deadmat over the wheel arches, then a single complete layer on the inside of the quarter panel skin. Now for the bit that makes the biggest difference. Sealing the quarter panel. Supra's come with two types of rear speaker one is simply mounted on a metal frame, and the other is in a black box, similar to the front door but bigger holding about a 6" speaker. If its the box type, its easier. anyway this is how you do both. Buy a product from your local motorfactors, called Autoflex by Autochem. it comes in a box of 4 large squares, so one box of them will do this job. They need to be heated to be flexable, so leave them in the hot press, until you are actually fitting them. (air temp must be at least 10c, so forget this job on a winters night). Measure and cut a mat to cover each side of the speaker bracket. On the part where the seat belt passes through leave the backing on where it might make contact with the seat belt. careful not to cover the panel mounting holes. Use a heat gun to almost melt the mat onto the edges. you can cut small pieces to cover any awkward area's. The idea is to get it airtight as possible. To make an even better job use the fibre stuffing from a pillow (white wool like stuff) to fill up the enclosure. This will help kill road noise and tighten the sound of your rear speakers up some. I have done all this and yes it works!. Also try putting some of the deadmat underneath the backseat. The finishing touch is another B J auto acoustics product They make a grey heavyweight matting for undercarpet. you need enough so you can put your boot carpet over it and cut around the shape. This is an excellent noise killer when you get a good fit. B J make some car specific kits but not for a MK4 supra only a MK3. Best to go your own way and do it right. I have SO2's 265/35/18's on the back and mine is fine except on the very worst road surfaces. Some famous noise generators are Pirelli P6000/7000/Zero. The only tyres I know which are pretty quiet are Bridgestone SO2 or 3 or Michelin Pilot sport. I can enjoy my music now, my car is almost is quiet as a 3 series. I have also done the doors, but this is an option. Hope you can hear yourself think soon

[SKI]

Yeah... Thats the guidance I got from a pal who's also got a Supra, I think he posted the original.

 

SKI

[Aerotop Dave]

Originally posted by Matt Harwood

It's a common misconception that Dynamat and associated products, (Brown Bread, Barrier mat etc)

 

Brown bread? Could be useful - get caught in a snow drift and you can start munching your sound proofing for nutrition

[SupraHuman]

Arise old thread...I am looking to soundproof my car.I have no back seats and the boot is empty.I am thinking of doing the whole interior I.E doors,under carpet,wheel arces and boot.Has anyone done this and where did you get the materials from?I've seen the noisekiller link above and also found a yank website called second skin.Please post your results if any and let me know where you got it from.

Thanks in advance.

CK

[Chiefgroover]

http://www.caraudiodirect.co.uk/index.php?manufacturers_id=106

 

I'll order some luxury liner pro see how it goes.