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 Post subject: Re: Sounddeading Mat
PostPosted: Sun May 25, 2008 10:45 am 
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Don't worry, tried and all I understand perfectly. Why are you tired, up all night or working on the Swift? My arms are real tired from all the scraping and sceezing on the mat so it would bond good.

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 Post subject: Re: Sounddeading Mat
PostPosted: Sun May 25, 2008 1:30 pm 
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LOL I haven't had a Swift since last October :P. Long hours and side jobs make me tired...

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 Post subject: Re: Sounddeading Mat
PostPosted: Mon May 26, 2008 11:04 am 
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You don't have a Swift since October, what happened to it, might I ask?

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 Post subject: Re: Sounddeading Mat
PostPosted: Mon May 26, 2008 11:07 am 
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I sold it to JSwift on the board...

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 Post subject: Re: Sounddeading Mat
PostPosted: Mon May 26, 2008 12:06 pm 
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another thing is that the sound deadening stuff makes it sound better, your not pushing the speakers as hard and therefore gain headroom. The fact that the panels dont vibrate aswell means that it will sound tighter, you wont have waves disapearing through your body panels, more like deflected and absorbed. So like he said if roadnoise is 80db and you bring it down to 70, thats a noticable improvement.

The good places to do it aswell as trunk/doors for stereo, is the floor panels and up by the firewall and overtop of the wheel wells if you are limited. if youve got a bunch, do the whole car, it only weighs like 15lbs and it makes such a difference. even on my gti race car im going to put it in everywhere and still have a stereo in there.

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 Post subject: Re: Sounddeading Mat
PostPosted: Mon May 26, 2008 1:21 pm 
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swift13b wrote:
if youve got a bunch, do the whole car, it only weighs like 15lbs and it makes such a difference.



If your doing a whole car and its only adding 15lbs you have some very thin mat. Last whole car (doors, floor, ceiling, hatch, 1/4 panels, firewall, some of the plastic panels) that I did had close to 100lbs added to it with a single layer. Definetly made a big difference in the amount of noise in the car and as a bionus you could hardly hear anything outside the car too...draws less attention from theives/law enforcement.

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 Post subject: Re: Sounddeading Mat
PostPosted: Mon May 26, 2008 1:30 pm 
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the 50 sq ft rolls of b-quiet ultimate I got weigh about 15lbs. I didnt plan on using much more than one whole roll though. Its fairly thin I guess, its not the thinest, its just a little thinner than name brand dynamat

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 Post subject: Re: Sounddeading Mat
PostPosted: Mon May 26, 2008 1:57 pm 
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Yeah I think I spoke too soon. The more I think of the amount of mat that was used the less I think it would have been anywhere near 100lbs. Unless mat of 5 years ago was a lot heavier...

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 Post subject: Re: Sounddeading Mat
PostPosted: Mon May 26, 2008 2:02 pm 
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yeah, so seriously, cover the whole car ;)

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 Post subject: Re: Sounddeading Mat
PostPosted: Tue May 27, 2008 8:04 am 
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Oh, didn't see that post m, swift13b, I started from up on the fire wall (To were my fat hands could reach)and worked my way down and covered the entire floor. Where I put speakers, I put like a 1'x1' square, would it affect it that much or should I do the entire panel on the inside? Also, on the issue of weight, what is the difference in lbs for stock to the mat?

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 Post subject: Re: Sounddeading Mat
PostPosted: Tue May 27, 2008 10:43 am 
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who cares, do the whole car or as much as you can and never look back

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 Post subject: Re: Sounddeading Mat
PostPosted: Tue May 27, 2008 12:53 pm 
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I'm a cheap bastard... :lol:

I'm doing my own sound proofing mat...

First clean the surface, take some 80 grit to 320 grit sandpaper, and give the surface a complete scuffing, you want to rough it up so the spray vinyl sticks. REMEMBER to CLEAN the surface with clean microfibre rags or shop towels, and use a window cleaner to do it.

Next, apply 2-4 coats of Vinyl bed liner, this will handle extreme heat/extreme cold the best.

*optional* You can use adhesion promoter before either of these.

Then apply 2-4 coats of rubberized rocker panel spray, this stuff will be high rubber content and should harden when done. This will give you the bulk of the mass, and responds better to being at around the same temp as the cabin.

Spray on some adhesive and use some aluminum foil to cover the coatings, shiny side down lol.

*optional* Buy some thin sheets of neoprene, how thick depends on you, and lay it down on top. First step though, use your spray adhesive, to coat everything, makes it act like a sealent, let it dry, toss on a second coat, let this dry. Now with the third spraying you lay down the neoprene. The adhesive acts as a dampener between the rubber and coatings.


Warning: This is far harder to remove than standard sound deadening matt.

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 Post subject: Re: Sounddeading Mat
PostPosted: Tue May 27, 2008 1:25 pm 
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and far more time consuming, having to buy all sorts of products and have lots of steps of waiting and what not.

why not just buy a 50ft roll for 130bucks and be done with it? all you gotta do is clean the surface well enough and lay it down, even 1 layer will do. put 2 in the crucial areas if you like, more on firewall, more on doors, more at trunk etc. im just doing a single layer all around my entire car, roof included

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 Post subject: Re: Sounddeading Mat
PostPosted: Tue May 27, 2008 2:58 pm 
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spray it with rubberized undercoating. lol...

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 Post subject: Re: Sounddeading Mat
PostPosted: Wed May 28, 2008 2:01 am 
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swift13b wrote:
and far more time consuming, having to buy all sorts of products and have lots of steps of waiting and what not.

why not just buy a 50ft roll for 130bucks and be done with it? all you gotta do is clean the surface well enough and lay it down, even 1 layer will do. put 2 in the crucial areas if you like, more on firewall, more on doors, more at trunk etc. im just doing a single layer all around my entire car, roof included


I knows, I just have alot of spare time this summer, and it gives me something to do, and lets me enjoy the fruits of my labours. But I agree this is a time consuming adventure, not for everyone, I'm also mixing and matching a few various styles of mats into one all in compassing monstrousity.

Hope I get some good results, and so far it seems to be working well, in killing the noise transmission from outside to inside.

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 Post subject: Re: Sounddeading Mat
PostPosted: Wed May 28, 2008 7:41 am 
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lol, if you have a noise transmision, dosn't that mean that there is something worng?

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 Post subject: Re: Sounddeading Mat
PostPosted: Wed May 28, 2008 11:30 am 
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I think it was the transmitting of the noise through the body he was wanting to stop

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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 7:49 am 
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I hope so, becuase if he it trying to stop hearing the transmission because it is making nosie, there might be something wrong there.

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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 9:50 am 
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what about using the spray in foam they use on structures, homes, etc...? i think i am going to try that for the interior pannels in the back half of the car.

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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 10:25 am 
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Spray foam needs air to harden, unless you get the two part foam. It also makes a terrible mess of things.

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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 11:07 am 
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But it works great. Don't put too much or when it expands it'll pop out the panels. Also realize that once its in its never coming out again without a lot of hassle.

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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 11:14 am 
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what about using home insulation also? in the rear and doors? my dad is a general contractor, so i can use all this action. stuff the doors, and rear pannels. where is most of the sound created from? floor and engine right? so maybe i am thinking about sound proofing the wronge spaces.

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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 11:40 am 
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Regular insulation batting will hold the water in and eventualy rust out your doors and quarters. The home stuff will also settle in the bottoms which won't do much good. Floor, quarters, and doors will be the biggest ones that let noise in. Many people just do the doors and it makes enough of a difference for them to leave the rest. Its up to you how far you want to go with it. I've seen cars with a couple of hundred pounds of non-hardening modeling clay in them. It all comes down to what you need to be happy :)

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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 12:34 pm 
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this is what im getting at, do i need to do anything here, on the floor, or in the empty walls?
i have gutted the rear, cleaned it, and am building a bed for it. we dont get much rain here, 15 in. a year. and you think it would be bad to use the spray foam in the side wall cavities?


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 Post subject: Re: Sounddeading Mat
PostPosted: Fri May 30, 2008 3:50 pm 
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You guys realize that sound deadenng Mat works by adding weight right? So the heavier the mat the better it will work to reduce vibrations. If you just want to keep out exterior noise I would recommend using close cell foam. It's alot lighter and will drasticaly help trap in/out noise like road-noise etc. Sound deadener stuff like RAAMAT or Dynamat's main purpose is to stop vibrations when putting in a subwoofer system. Other than that go with close cell foam, its also WAY WAY cheaper, lighter weight and more effective.

http://www.raamaudio.com/cgi-bin/index.cgi?p=pr

If your putting in woofers I would use both RAAMAT or similar deadener and the close cell ensolite foam.

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