Sound deadening mats

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DurocShark
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Sound deadening mats

Post by DurocShark » Sun Jan 06, 2019 7:00 pm

I don't know what the ultimate difference will be, but I had some rust in the rear cargo area that needed some attention. So I decided to go whole hog and install Noico mat.

Before:

Image

Primer:

Image

Matte black paint (still wet):

Image

Noico mat:

Image

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Amskeptic
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Re: Sound deadening mats

Post by Amskeptic » Mon Jan 21, 2019 9:32 pm

DurocShark wrote:
Sun Jan 06, 2019 7:00 pm
I don't know what the ultimate difference will be,
Noico mat:
Well? What IS the ultimate difference?
Colin :bounce:
2019 Annual Funding Drive!
**********************************
viewtopic.php?f=41&t=13755

BobD - 1978 Bus . . . . . . . . . . .111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 97,179 miles
Pluck - 1973 Squareback . . . . . 55,510 miles
Alexus - 1991 Lexus LS400 . . . 77,717 miles

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DurocShark
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Re: Sound deadening mats

Post by DurocShark » Thu Mar 07, 2019 6:11 am

Sorry, I don't seem to be getting notifications from here. Grrr...

Noisy exposed engine with a lumpy cam and craptacular Empi exhaust...

HUGE difference! I haven't even done the doors or roof yet. Just the inside.

I even threw together a video!

https://youtu.be/TYxAMh1YFr0

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Amskeptic
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Re: Sound deadening mats

Post by Amskeptic » Thu Mar 07, 2019 6:22 pm

DurocShark wrote:
Thu Mar 07, 2019 6:11 am
HUGE difference!
Before and after audio recordings?
Colin
2019 Annual Funding Drive!
**********************************
viewtopic.php?f=41&t=13755

BobD - 1978 Bus . . . . . . . . . . .111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 97,179 miles
Pluck - 1973 Squareback . . . . . 55,510 miles
Alexus - 1991 Lexus LS400 . . . 77,717 miles

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DurocShark
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Re: Sound deadening mats

Post by DurocShark » Thu Mar 07, 2019 9:06 pm

I actually have some gopro video from before. After I fix my busted throttle cable (stupid Empi linkage) I'll take some after... :)

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asiab3
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Re: Sound deadening mats

Post by asiab3 » Thu Mar 07, 2019 11:00 pm

Ooh ooh ooh, I'm installing an interior in a bus tomorrow, and we have a few pounds of Dynamat for the larger panels and door skins. I'll make sure we get an audio recording before and after, with manual gain and mic placement consistent between takes.

I don't know how people drive their cars with doors that resonate like gongs…
Robbie
1969 bus, "Buddy."
119k miles with me.
296k miles on Earth.

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Re: Sound deadening mats

Post by DurocShark » Fri Mar 08, 2019 6:09 am

I haven't done my doors or roof yet and there's a big difference. Can't wait to get the rest...

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Amskeptic
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Re: Sound deadening mats

Post by Amskeptic » Fri Mar 08, 2019 2:13 pm

asiab3 wrote:
Thu Mar 07, 2019 11:00 pm
A) I'll make sure we get an audio recording before and after, with manual gain and mic placement consistent between takes.

B) I don't know how people drive their cars with doors that resonate like gongs…
Robbie

a) Do you coat the living hell out of every square inch of surface,
or do you follow the directions? (<loaded question)

b) Early buses had a tinny clout upon closing, but the door beam regulations of 1973 allowed just a bead of caulk between the door skin and the beam to quiet things right down.

Waiting For An Audio Old Timey Volkswagen Radio Show.
2019 Annual Funding Drive!
**********************************
viewtopic.php?f=41&t=13755

BobD - 1978 Bus . . . . . . . . . . .111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 97,179 miles
Pluck - 1973 Squareback . . . . . 55,510 miles
Alexus - 1991 Lexus LS400 . . . 77,717 miles

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DurocShark
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Re: Sound deadening mats

Post by DurocShark » Fri Mar 08, 2019 2:16 pm

For me, you can see in the pics I don't do EVERY square inch. Large unsupported panels are where you get the best gains. Factory put tarboard on the pans and inside the rear quarters for that reason. But they had to be all about bang for the buck, so there are still gains to be had if more money and labor are put into it.

In the Guac, I slapped a single 12"x12" square of deadening mat in each door. That alone made a big difference.

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Amskeptic
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Re: Sound deadening mats

Post by Amskeptic » Fri Mar 08, 2019 6:24 pm

DurocShark wrote:
Fri Mar 08, 2019 2:16 pm
Large unsupported panels are where you get the best gains.

We have a winner!

There are two kinds of sound deadening. One is to muffle the "speaker" of large metal panels.
The other, applied with stunning effect in modern Lexuses, is de-coupling the interior surfaces from contact with the metal "speaker" panels. So you dampen the metal speakers with the correct amount of coverage mats, and you throw on some carpet with jute backing, and I have found, oddly enough, that the accordian heater ducts are a huge noise intrusion if you don't have the mesh with filler material like the original ducts have.
Colin
2019 Annual Funding Drive!
**********************************
viewtopic.php?f=41&t=13755

BobD - 1978 Bus . . . . . . . . . . .111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 97,179 miles
Pluck - 1973 Squareback . . . . . 55,510 miles
Alexus - 1991 Lexus LS400 . . . 77,717 miles

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DurocShark
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Re: Sound deadening mats

Post by DurocShark » Fri Mar 08, 2019 8:32 pm

And that's why boxes often sound better than hard mounted speakers.

But I'm more interested in isolating engine noise than anything else. I'm not an audiophile, but a noisy engine can be annoying for more than a quarter mile at a time... ;)

With what I've done so far, a single quiet pack exhaust, and a progressive carb on my 1835, it sounds great. Just a nice deep growl at WOT. Pea shooter exhaust on a stock engine has never sounded good to me. Open that second barrel and you hear both ends of the engine without the high frequency noises that are normally associated with an aircooled engine.

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DurocShark
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Re: Sound deadening mats

Post by DurocShark » Fri Mar 08, 2019 8:35 pm

And if you exit the car, many of those high frequency noises are still there. No matter what you do, valve trains on VWs are noisy compared to hydraulics. And without the water jacket and the heavier metal around them, you get far more noise even a few feet away than you do with a "traditional" engine.

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asiab3
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Re: Sound deadening mats

Post by asiab3 » Fri Mar 08, 2019 9:42 pm

I follow the directions; it doesn't do much when applied to small patches of metal. 40% coverage is indistinguishable to my ear from 90% coverage.

Sorry we didn't get around to Dynamat or even a tin can test drive today… Perhaps next week. (We DID get nicely flush aftermarket taillight lenses and housings installed…)
Robbie
1969 bus, "Buddy."
119k miles with me.
296k miles on Earth.

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