Sound deadening comparison video:

VanMan2009 · Posted: Thu Aug 30, 2012 2:38 pm Post subject:

just to add on, since this has been sort of a pet-project of mine and I've read a lot on the subject.

1. Denwood - I seem to remember the post you were talking about, it's a couple years old I believe. Anyway, if it's the same one I'm thinking about the only sound deadening that was done was to reduce panel resonance via a fatmat product, or something like that. All this stuff does is keep the panels from vibrating so much and amplifying / creating noise. It doesn't block the noise from the engine /tires /air, which would explain why he didn't see much of an improvement.

To get best results you need to dampen the panels, and then float a mass loaded vinyl (or similar) product over it. The foam layer exists to decouple the MLV from the body to keep it from amplyfying sounds. You need all 3 for the best results.

2. PDXSyncro - the 2 in one product (foam + MLV) will work, but I've read in other forums it can be a challenge to work with, given it's increased thickness. Somestimes in tight spots you may only be able to squeeze in a little bit of foam and MLV, but you lose that option with the dual product. Also when you overlap ends you'll get more thickness as well since you've now got a layer that's foam, vinyl, foam, vinyl.

Anyway, just my 2c

randywebb · Posted: Thu Aug 30, 2012 3:02 pm Post subject:

agree - but you can just scrape the foam off for the small areas involved

it is easier to work with the composite over most areas

PDXSyncro - shipping can e a killer on the MLV as it is heavy; look around locally

BTW - in an old thread somebody mentioned something that home depot carries - a search might turn it up
_________________
1986 2.1L Westy 2wd Auto Trans.

PDXSyncro · Posted: Tue Sep 04, 2012 10:42 am Post subject:

Good comments. At the end of the day I'm not hopeful that I'll get anywhere near the STC that the product advertises (28 I believe in this case). What I'm hoping is to reduce the noise down to a level where conversations are possible while cruising at 70mph. As was it was very difficult. If I can get that noise down and start having some normal conversations I'll be happy and worth the money/effort. I'm also going to change from BFG's to Nokian WRC's so that should help as well. I guess we'll see. I'm definitely going to validate this to see whether the change in noise is noticeable and worth it. I report back when done with some pics.
thanks,
glen

randywebb · Posted: Tue Sep 04, 2012 12:17 pm Post subject:

you'll want to address wind noise also

and have you done any treatments under the dash?
_________________
1986 2.1L Westy 2wd Auto Trans.

PDXSyncro · Posted: Tue Sep 04, 2012 1:19 pm Post subject:

Any thoughts on wind noise reduction? I haven't researched that. I currently have some wind/rain deflectors on the front doors. Not sure what else can be done.
I didn't take out the dash so I didn't have plans to do anything there. I guess I could bite the bullet on that and take it out and put fatmat on as I have some. I was going to bypass that one though as I saw the dash removal as a giant pain. I know that there are videos and write ups on it but outside of dampening what other benefits do I have with removing that? Anything else I could do while in there?

randywebb · Posted: Tue Sep 04, 2012 1:39 pm Post subject:

it is a pain - the size of the pain relates to your age, and ability to do various yoga positions

there are lots of other things that can be addressed with the dash out tho - or just get up under there with it in place...

GW has those door edge strips and there are the extra seals used on later MY's) that people have posted about here

apply dampener to the door skins & a layer to replace the plastic weather seal - IIRC, I posted pics of this when I did it to mine & I thin there is an example photo sequence on cascadeaudio's web site

Ultimately, you would need to redesign the entire front of a new vehicle to really reduce wind noise...

Urethane suspension bushings generally do a great job of increasing NVH and tire noise, so I suggest avoiding those.

Good Luck!
_________________
1986 2.1L Westy 2wd Auto Trans.

PDXSyncro · Posted: Tue Sep 04, 2012 1:47 pm Post subject:

FYI for others I found this MLV/Closed Cell Foam composite that appears to be the cheapest yet at $200 for 90sqft + shipping:
http://www.yahoosoundproofing.com/compositevinyl.html

Bman · Posted: Fri Sep 07, 2012 9:35 am Post subject: How About the Roof

My Doka is currently getting a new roof, and before replacing my headliner I would like to place some sound deadener up above. It seems this thread talks about a spray on option as being preferred, however I do not think this is an option for me considering $$ and time. Has anyone used the fatmat, second skin, peel and stick products on the roof? I just don't want the heat of a hot day to melt or run any asphalt materials down into my headliner and make a mess.

When it rains, the top of my doka sounds like a jamacian steel drum. Syncrodoka suggested that I use the stock tintop felt material from another van, I tried sourcing this, but my seller disappeared. Anyone have a suggestion for roof applications?
_________________
~Bryan
1990 Burgandy Tintop (Wife's Daily Driver)
1989 Tiico Westfalia "Taj"

2WD Doka build thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=503578&highlight=
FaceHook:
https://www.facebook.com/pages/VW-T3-DokaSinka/129026087217120?ref=hl

PDXSyncro · Posted: Fri Sep 07, 2012 11:30 am Post subject:

There's lots of threads on this but you can still go with a spray based solution that is cheap. Noxudol has a aerosol product that sells for 27.50 a can:
http://www.noxudolusa.com/noxudolstore/ccp0-catshow/SoundDamping.html

You might call them to determine how much sq ft you can cover with a can.

Just a thought.
cheers,
glen

westyventures · Posted: Fri Sep 07, 2012 2:02 pm Post subject:

I recently applied three coats of QuietCar to my Syncro Westy - inside all panels, on the floor, over the engine. It took four gallons and the results are astounding. The five-gallon pail set me back $300 shipped (it took 4 gallons), $20 for a cheap schutz gun. All cavities were then insulated with EnGuard batts.

randywebb · Posted: Fri Sep 07, 2012 2:19 pm Post subject:

manfs. make products specifically for roof applications - dynamutt & cascadeaudio should have them
_________________
1986 2.1L Westy 2wd Auto Trans.

Farfrumwork · Posted: Fri Sep 07, 2012 3:40 pm Post subject:

PDXSyncro · Posted: Fri Sep 07, 2012 11:16 pm Post subject:

eeebee · Posted: Sat Sep 08, 2012 12:50 pm Post subject:

almo · Posted: Mon Feb 10, 2014 1:08 am Post subject:

PDXSyncro · Posted: Mon Feb 10, 2014 6:41 am Post subject:

Hi Almo,
There's this stuff out of Bend Or:
http://cascadeaudio.com/car_noise_control/vb_1x.htm

Cheers,
Glen

westyventures · Posted: Mon Feb 10, 2014 8:45 am Post subject:

QuietCar is also sold as QuietCoat, same product:
http://www.soundcontrolroom.com/shop/quiet-coat-noise-vibration-dampening-coating

westyventures · Posted: Mon Feb 10, 2014 10:52 pm Post subject:

Also, another less expensive product I just turned up:

http://acousticalsolutions.com/31~vbd-10-damping-compound

I think I'll give it a try in the next project.

Steve M. · Posted: Sat Feb 15, 2014 9:18 am Post subject:

I came across this article, but haven't had a chance to read it yet. It might be worthwhile, but I jumped to the end of it and "they" are trying to sell you their product so I kinda kills the unbiased opinion I hoped I would find in reading it.

http://www.sounddeadenershowdown.com/

almo · Posted: Mon Apr 07, 2014 5:09 pm Post subject:


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