Sound Deadening FAQ

I would say your 60K service cost seems very high. However, the dealerships will do a LOT of things that do not need done as certain points. They may be changing a timing belt/WP or gaskets that are also perfectly fine. What work exactly are they doing.

 

PS: Thanks for the links to the weather stripping and I hope your car comes back in good shape. Looking forward to the pictures.

Dang, you put that quite liberally, everywhere!

 

None of that affected the door's ability to close and seat properly?

 

I'm tempted to do this tomorrow on my day off...at 3-5 bucks a roll, figure it's worth a shot.

Picture of the hatch area?

One of the easiest things I have done that made a big difference was adding mass loaded vinyl to the back of the rear seats. I was able to slide it in-between the seat and the carpet backing and it stays perfectly in.

 

I could tell a huge difference with this, and this was done after I put dynamat in a checkerboard fashion over all door-skins and also put mass loaded vinyl inside the door panels.

Hello hello,

Legacy is home safely and running well. Total charge was one dollar less than their estimate - $2,364.00 vs $2,365.00. Cute.

 

Anyway, here are the pics of the door seals after installing the rubber tape insulation. The pics are hard to caption individually so here is the flow:

 

- driver door open- front fender interior visible

- driver door additional pics

- rear side door, driver side

- rear door stamp in bodyshell

- rear door hinge - btwn the drivers door and rear door

[the car is filthy inside. Thankyou for not mentioning...]

 

PICS HERE

https://picasaweb.google.com/thburkart/SubaruSeals?authuser=0&feat=directlink

 

Yea, I guess that would have to reduce the noise. I can now see why you have 10+ rolls on there. Must be soft enough the OEM door seal still makes full contact or the noise would have increased or water leaked.

I will not be doing that to mine at this time. Maybe, around the trunk. IMO my stock 08 is the quietest car I have owned. Much more so then the 05 Corolla I had. Then again I am accustomed to old trucks with drastic wind noise and other noise. I put 60 lbs of RAMMATT in the old 97 F150 when I upgraded the radio, that really helped. Still, it is hard to quiet down a brick flying through the air.

Whatever works.....

From a fellow audiophille, this link may to be of someones interest:

 

http://www.sounddeadenershowdown.com/cgi-bin/index.cgi

 

 

There is a lot of misconception out there about "sound dampaner"

This link should clear up a few things

From a fellow audiophille, this link may to be of someones interest:

 

http://www.sounddeadenershowdown.com/cgi-bin/index.cgi

 

 

There is a lot of misconception out there about "sound dampaner"

This link should clear up a few things

 

This was already linked on page 2 and discussed numerous times since then. READ. This thread is only ten pages.

This was already linked on page 2 and discussed numerous times since then. READ. This thread is only ten pages.

 

10 Pages too much for me. Than let my link be to all those who don't feel like going back through the thread. Let it be a means of convenience

The major takeaway is -- unless you're trying to improve your stereo response, insulating a Subaru to reduce road noise has little to no effect. You just wasted money and added significant weight to your hood. If you want a quiet car, I'd go buy something else.

Everything you need to know is here: http://www.sounddeadenershowdown.com/

Or this: http://legacygt.com/forums/showthread.php/sound-deadening-and-stereo-install-159235.html?t=159235

Sorry I'm late to the party. That price is by far the worst I've heard and I see no excuse for it. Why do you think dealerships are called stealerships here? The 60K (and 120K) service on a 2005 LGT is about $650 at LIC Motorsports (Subaru specialists) in Novato, California, a high-labor-cost area.

 

****** My 60,000 mile service IS COSTING $2400.00 *****

how outlandish? very? not very??

Is there anyone in the San Francisco Bay Area that does sound-deadening installation on our LGT cars for a reasonable price?

So i read the entire post and i still cant decide which would be best for road noise and to really quiet the aftermarket exhaust within the cabin. If anyone has attacked at canceling the cabin noise from the aftermarket exhaust please help. thanks in advance.

I'm in to hear more on this ^^^ too. SPT V2 on the Sedan and it's honestly a little louder inside than I want. Outside, sounds FANTASTIC. Inside, meh.

^^^ True. I did before and after DB tests when I did mine. Absolutely made a difference.

I need to get to your shop citka.

 

The creaking is gone with the coilovers but I just put the SPT on and need it a liiiiiiittle quieter.

Thanks for that!

Would something like this be ok ?

 

It's not sound deadning "material", its actually a Dei tunnel heatshield that I had laying around. I just thought why the hell not, had no other use for it. It's pretty thick. I just tried to follow the checkboard pattern to cover as much as I could. So will this help some or was it a waste of a time ?

 

Also. I was upgrading my speakers to infinity 2-ways. And I just used some 16/18g wires had laying around. I would have liked to use thicker wires, but fiquring that the stock speakers wires are just as thin. It wouldn't matter.

 

http://i344.photobucket.com/albums/p330/ibr_adam09/photo3.jpg

http://i344.photobucket.com/albums/p330/ibr_adam09/photo4.jpg

That's some pretty interesting checkerboard work. Should make some difference for vibration as you have added mass which is the key to limited the metal's ability to vibrate. It won't do much for actually blocking sound with that setup though.

Everything you need to know is here: http://www.sounddeadenershowdown.com/

 

I kid, I kid.

 

Was that Burkart guy banned? Where did his posts go? I'd like a source for the rubber tape he used.

..................I think the main reason for the extreme sound level is the horrible roads here in Sweden.

Couarse roads, you havent seen it at all.

 

The first trip make me almost cryed.. What the heck have I bought, my first personal payed new car!!

 

My wife in her new BMW 320d had an very pleasant time..........................

 

............................So, finally I find my solution:

 

Change wheel (the original 17" tires with Yokohama SG2 winter tires) Even if this tire is the bottom 2 of 10-12 winter tires tested, at least the $£€@@ fcn car it QUITE now.

 

Conclusion:

1. If the roads are bad or like in a war condition (like here in the great country of Sweden) you cant sound deadening the road noise.

2. But if you take the time to do it anyway, you can make it a whole lot better

3. But (hate to say it) if you go for smaller wheels, and higher tires its gets a lot better. ...........it you think your car is quite, it is because your roads are perfect.... Dont think you live here in Sweden.

 

I agree with you that in the Legacy wagon the road surface has a huge effect on how much road noise gets into the passenger cabin. On glassy smooth asphalt surfaces, the interior is quiet. But as the road surface becomes coarser and more "pebbly" the interior noise level increases substantially.

 

I find it interesting that you seem to have had the best noise reduction results not from all the sound deadening materials you installed, but from switching to Yokohama winter tires! Winter tires are usually not that quiet, compared to other tire classes. Recently, both Pirelli and Continental have announced they are manufacturing special tires for Audi, with interior noise reduction being a design goal.

 

http://www.tirebusiness.com/article/20130717/NEWS/130719921/pirelli-absorbs-tire-noise-with-pu-sponge

"...........Pirelli claims the innovation—being pitched as "Pirelli Noise Cancelling System"—can reduce the noise heard by those inside the car by 2 to 3 decibels, or roughly half.

 

With this development, Pirelli is addressing noise caused by the vibration produced when air inside the tire is compressed as the tire is squashed against the road. This noise is transmitted from the tire to the wheel hub and eventually reaches the inside of the car's cabin via the steering and suspension components.

 

The polyurethane foam sponge is designed to absorb these vibrations, the tire maker said, and thus reduce the amount of noise passed through to the cabin..........."

 

http://www.autosphere.ca/tirenews/2013/08/09/continental-introduces-contisilent/

 

".........Continental has introduced ContiSilent, a new technology that significantly reduces tire noise inside the vehicle. Continental says the improvement can be as high as 9 dB............"

I would take another route to reduction of resonance.

 

At some point, I would like to cover the bottom of the car with truck bed liner to provide protection against road salt corrosion and stone chips. It may get complicated around attached items like the rear differential or near the exhaust, but you can get a bucket of this stuff for a reasonable price and I would expect some sound deadening in addition to the protection it provides. You may have to add heat shields or heat wrap around exhaust components and drop the fuel tank to get the coverage you want, but I am sure the body would end up much quieter.

 

Some people who have trouble with loud exhausts report good results from using dynamat or its equivalent on the heat shield above the muffler.

Truck bed liner would not be practical due to the surface prep required. I had a crummy job at Ziebart years ago where we were a Rhino Liner outfit. A lot of prep goes in before applying the spray.

You would be just as well off having the undercarrige sprayed with rustproofing. That stuff is like thick tar and sticks like mad. You can be fairly meticulous with it. I have no idea how one could be thorough with bedliner since, once you start spraying it-you can't stop. The part A and B will harden at the disposable tip.

Looks like this thread hasn't had much added in years so I hope someone is still watching. I'm trying to reduce road, wind and (other) vehicular noise.

I have many questions but I'll start with just a couple:

- Does putting, say Fatmat, under the hood reduce noise? I've read in some places ~40% of the noise comes from there.

- I've also read that changing the weather seal around the doors is a big improvement. Has anyone tried this and if so what size/type of seal did you use? Obviously too big and the doors won't close.

 

Thank you. I have a 2008 Legacy. Any yes I did read the entire thread! :-)