Sound Damping Impreza 2008

**digitalbots** · 12-11-2012 10:22 AM

So i got 95k on my 2008 impreza and I have noticed a considerable about of noise in the cabin. I have been reading online how people put dynomat in the door panels and have seen a huge decrease in road noise so I was wondering has anyone tried this before? I checked with the audio team at frys and they only charge $40 to dynomat the doors (not including materials).

**Mikie13** · 12-11-2012 11:33 AM

I'm sure it would work fine. But I'd be certain you get more road noise from lack of sound deadening material under the floor carpets as well.

Dynamat isn't cheap for the materials itself...you're potentially looking at an expensive sound deadening project.

Do it yourself and use this from Home Depot: Instant Waterproof Repair and Re-Roofing Material-QR625 at The Home Depot

**digitalbots** · 12-11-2012 11:37 AM

Originally Posted by Mikie13

I'm sure it would work fine. But I'd be certain you get more road noise from lack of sound deadening material under the floor carpets as well.

Dynamat isn't cheap for the materials itself...you're potentially looking at an expensive sound deadening project.

Do it yourself and use this from Home Depot: Instant Waterproof Repair and Re-Roofing Material-QR625 at The Home Depot

great idea but is there a guide to pulling back the carpet in the car?

**Mikie13** · 12-11-2012 12:26 PM

I'm sure there is somewhere on Nasioc or somewhere. I don't personally know (or even google?).

But removing seats are pretty easy. Same with popping off the door cards.

**digitalbots** · 12-11-2012 12:54 PM

I found this thanks :0

Tutorial - Seats / Carpet / Interior removal - YouTube

**rage-wrx** · 12-11-2012 03:59 PM

Great find. Wish I had seen this earlier. For the life of me I still cant figure out how one of the pieces that hold the driver side carpet in place go back.

**DemonWRX** · 12-12-2012 05:28 PM

Um....Mikie...have you used that stuff personally?

You do realize that is rubberised ASPHALT...which stinks.

I am all for repurposing stuff, and DIY what you can, but I don't think I would put asphalt in my ride as I can't stand the smell of it.

I would suggest e-dead/....it is cheap, has a good record (from what I have read) and comes in multiple forms including a paint on version.

not to mention that the roofing is $17 for 12sq feet, while the e-dead starts at $1 per sq. foot for the butyl rubber roll, or $38 for the paint that covers 50 sq. feet.

**SKI.WRX** · 12-12-2012 05:52 PM

For what it is worth, the older B-quiet Extreme dampening product was rubberized asphalt. I believe they switched to butyl rubber because of a greater effective temperature range.

**mangostick** · 12-12-2012 06:53 PM

the fumes the asphalt stuff gives off are also toxic.. definitely dont want to be confined in a car with that stuff. I found that a dynamat door kit worked quite well for doing my rear hatch area and another door kit worked well for doing the floor pan from mid front seats back. You dont have to go edge to edge on panels to stop them from being resonant. Tap around with your middle or index finger to find the spots that are most resonant and put a piece of matting there. I added pieces of dynamat in the hatch, hatch area floor (especially the vertical rear facing panel below the hatch opening.. that thing sounded like a mini gong when tapped on) the rearward portion of the spare tire well and the stamped metal braces right under the rear seat back.

**Mikie13** · 12-13-2012 09:31 AM

I have friends who have used that stuff...as well as Vinny (Silvercookie) on here. The smell isn't really a big deal. Never thought about the Toxicity (Of our cittttttty!) of it though. Thanks for the other stuff though Bruce, I'll look into that myself since I was planning on doing this after Christmas to my car anyway.

**digitalbots** · 12-13-2012 10:11 AM

Originally Posted by Mikie13

Never thought about the Toxicity (Of our cittttttty!) of it though.

LOL!

I thought about using the homed depot stuff then i saw this.

The Truth About Sound Deadening - YouTube

I felt he made a good point, but I want to try this e-dead stuff.

**DemonWRX** · 12-13-2012 11:17 AM

that guy is a tool....twitches like he is on something.

the info he gives is sound (ba-dump-dump) but the 'glue weights to your car' idea is stupid. I don't doubt it works, but gorilla gluing a 5lb dumbell to my trunk lid is not going to happen.

**Calvinball** · 12-13-2012 11:32 AM

Originally Posted by DemonWRX

that guy is a tool....twitches like he is on something.

Looks to me like he has Tourettes.

**Axex** · 12-13-2012 11:33 AM

Dynamat is good for mitigating vibrations, that's what it was designed for. So if you use it, do so sparingly. You don't have to cover an entire panel to keep it from vibrating, just the parts most susceptible to movement (the middle usually, or points furthest from where it's fixed). If you do cover a whole panel in it, you are really just wasting money. Due to it's nature, you will really only be cutting out vibrations and noises your CAR makes, which for some people/cars, is enough.

If you want to actually BLOCK noises from entering you need something denser, and you will need to cover whole areas. This might not be desirable for everyone though because it will certainly add weight so you have to chose what you want to do accordingly.

Here's some very good reading: Sound Deadener Showdown - Your Source for Sound Deadening Products and Information

They sell things there too, but you don't necessarily have to go with that. Stuff with similar properties will be ok if they can be had cheaper elsewhere!