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View Full Version : Review: Cheap DIY sound dampening



biketsai
11-24-2014, 05:37 PM
Searched some threads to find an alternative to quiet down some interior noise/drone from my exhaust. Came across another AZ thread where people used Reflectix. Reflectix is a thin aluminum housing insulator. The material reminds me of a thicker sunshade you would put in your car.

I have a 71r elim, 2.5" HFC, and 2.5" APR catback. The exhaust noise wasn't too loud, I just wanted it more quiet. Luckily I think that this $25 fix is good enough for me.

http://www.homedepot.com/p/Reflectix-16-in-x-25-ft-Staple-Tab-Insulation-ST16025/100012574
Home depot sells this stuff near their lumbar section.
Reflectix $16
Foil Tape $3
Double Sided Carpet Tape $5.
All in all, about $25 spent.

This roll is pretty big, I lined the complete wheel well for the spare. Then cut a piece to fit for the rear deck while using the double sided tape. I took a few small pieces and placed them inside the openings underneath the rear deck before I covered the underside of the rear deck. I also lined the end of the trunk where the plastic liner (the piece where the trunk latches on to) is by removing the 4-6 phillips screws.
Placed 2 large strips underneath the trunk mat from side to side and threw everything else behind the side lining of the trunk.

Result: Almost no noise while cruising with my exhaust at 60mph where I would get noise before. All I hear now is my engine on the highway. The bass from my sub feels a little more solid with slightly less rattle coming from random bits of my car. At low speeds (40mph>), it is definitely a little quieter but it is not completely gone like it is while I am cruising on the highway. Overall, definitely worth the $25.

texasboy21
11-25-2014, 07:33 AM
Nice!

walky_talky20
11-25-2014, 07:38 AM
Hmm. I may need to do this.

clumsyme
11-25-2014, 08:11 AM
I am curious how this would work for an avant. I am trying to kill some drone and I think this might work if I just do the underside of the floor in the back

RoadRage
11-25-2014, 08:57 AM
Very cool.

So 1 roll was enough to cover all of that?

biketsai
11-25-2014, 11:53 AM
Very cool.

So 1 roll was enough to cover all of that?

Yep, it is a prettty long roll (25ft x 16"). For the Avant, you could definitely place some of this material into the spare wheel well, which is were I put about 75% of my material.

melomandn
11-25-2014, 02:50 PM
I used the same stuff to stop my trunk rattle from my woofer, never thought to use it to kill exhaust noise.

Gonna have to try this [up]

walky_talky20
11-25-2014, 02:54 PM
I am curious how this would work for an avant. I am trying to kill some drone and I think this might work if I just do the underside of the floor in the back

I would think this would work even more effectively for an Avant, seeing as the cargo air space is contiguous into the passenger cabin. In the sedan, we at least have the seats and parcel shelf (srsly...parcels?) to block the noise. In the Avant, you gots nothin'.

biketsai
11-25-2014, 04:00 PM
I would think this would work even more effectively for an Avant, seeing as the cargo air space is contiguous into the passenger cabin. In the sedan, we at least have the seats and parcel shelf (srsly...parcels?) to block the noise. In the Avant, you gots nothin'.

Can't imagine having an open space like that. The exhaust is 10x louder when I have my seats folded down.

walky_talky20
11-25-2014, 04:15 PM
^True.

Modded Avant Drivers = TROO-pahs Bro

Poopie
11-25-2014, 07:48 PM
The noise in my wagon is excruciating. I wanted to do some dampening in the spring. I used this stuff many years ago.

biketsai
11-25-2014, 07:51 PM
The noise in my wagon is excruciating. I wanted to do some dampening in the spring. I used this stuff many years ago.

Just get a huge bean bag chair and keep it in the trunk. Should muffle the sound some ;)

Davdraco1
11-26-2014, 03:56 AM
Might have to try this one too!

RallyeBourne
12-09-2014, 03:36 PM
Picked up the materials today! Woot.

pbcrazy
12-09-2014, 03:53 PM
Might have to try a bit of this. I'm a huge advocate for quiet exhausts, I just can't stand the sound inside the cabin (except the spool, I enjoy that quite a lot). Wish they sold it in smaller batches though, can't imagine I'll be using 25ft of the stuff

RallyeBourne
12-09-2014, 06:01 PM
They sell a roll measuring 2ft x 10ft for like $10-11.

pbcrazy
12-09-2014, 06:31 PM
They sell a roll measuring 2ft x 10ft for like $10-11.

May go that route. Why the carpet tape and foil tape though? Couldn't you just use regular double sided tape and call it a day?

biketsai
12-10-2014, 05:39 AM
May go that route. Why the carpet tape and foil tape though? Couldn't you just use regular double sided tape and call it a day?

I didn't think I would use 25ft, then I probably realized I could use another 5ft of that stuff. Double sided tape is expensive as shit. Carpet tape is a huge long roll for $5 and the foil tape makes it looks seamless since it blends in with the material. You can use whatever you would like, this is just what I used.

B5A4coastie
12-28-2014, 02:13 PM
OK so I threw a bunch in today. It's not super pretty and I haven't done the speaker deck yet; maybe that's why I'm not blown away by the turn out. I bought the 24" roll since I wanted to line as much as possible.

Passenger side
http://i947.photobucket.com/albums/ad316/LTcoastieR/Mobile%20Uploads/20141228_122320.jpg (http://s947.photobucket.com/user/LTcoastieR/media/Mobile%20Uploads/20141228_122320.jpg.html)

Driver side (I removed the disc changer bracket, it's a pain otherwise)
http://i947.photobucket.com/albums/ad316/LTcoastieR/Mobile%20Uploads/20141228_131635.jpg (http://s947.photobucket.com/user/LTcoastieR/media/Mobile%20Uploads/20141228_131635.jpg.html)

Even the rear lip
http://i947.photobucket.com/albums/ad316/LTcoastieR/Mobile%20Uploads/20141228_141339.jpg (http://s947.photobucket.com/user/LTcoastieR/media/Mobile%20Uploads/20141228_141339.jpg.html)

The spare
http://i947.photobucket.com/albums/ad316/LTcoastieR/Mobile%20Uploads/20141228_143240.jpg (http://s947.photobucket.com/user/LTcoastieR/media/Mobile%20Uploads/20141228_143240.jpg.html)

You can hardly tell anything has changed
http://i947.photobucket.com/albums/ad316/LTcoastieR/Mobile%20Uploads/20141228_143612.jpg (http://s947.photobucket.com/user/LTcoastieR/media/Mobile%20Uploads/20141228_143612.jpg.html)

I have noticed the cruising decibel is lower in the car, but that's about it. Idle still seems the same as does the accel/deceleration decibels. I still plan on doing the speaker deck, but it started raining... I'll report back if that makes any difference.

biketsai
12-28-2014, 04:20 PM
I recommend filling the holes in the speaker deck and cover it as well.

A4orce84
12-28-2014, 08:51 PM
Nice job Chris!

getslideways
12-28-2014, 09:00 PM
Nicely done [up]

Another popular option are Peel and Seal variants:

http://www.lowes.com/pd_154017-81326-PS625_0__

Cheap, readily available at any HomeDepot/Lowes, and the best part is it already has adhesive on one side, so no need for tape or other means of fastening it. Just roll it out, trim it with scissors, remove the protective advesive backing and stick/press it on. Essentially a backyard dynamat lol Just used it in a friend's coupe last year and so far its still holding strong and doing a great job of making conversations possible inside the cabin haha

It also conforms to bends and curves really well:

http://i230.photobucket.com/albums/ee286/msteph1086/IMG_2450.jpg

Just mentioning it as another cheap DIY alternative to sound deadening.

Usually its only found in the narrower rolls like this:

http://mobileimages.lowes.com/product/converted/095959/095959062513lg.jpg

But I have seen it offered in wider rolls too:

http://i2.photobucket.com/albums/y35/volsfan32119/camaro001-2.jpg

RallyeBourne
12-28-2014, 09:38 PM
Good to know. I did the Reflectix inside my entire hatch and under the rear seat. I planned on doing the entire cabin floor, but held out because I was a little afraid of the crinkling sound under the carpet. I think that peel and seal looks like the alternative I need.

My take on Reflectix: so far, it's been great, for what I wanted. I had a lot of road noise at highway speed. It's almost gone. As said before, acceleration noise isn't really reduced, but that's okay, because 1, I like that noise, and 2, because that comes from the engine bay, not the hatch, so I didn't expect that to decrease.

ewmin3m
03-15-2019, 01:59 PM
bringing this thread back from the dead, as I'm also trying to get rid of some drone.
One question with regards to cutting up the sound dampening material, is it less effective to cut it into smaller pieces and then apply everywhere to maximize coverage and reduce waste ? OR is it recommended to not cut up entire sheets and try to mold a big sheet as is ?

I'm thinking it'd be easier to cut small strips and kind of plaster them on (like you would do for a cast for example) but I'm not sure if its just as effective.

Any thoughts would be appreciated