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  #1  
Old December 22nd, 2012, 03:01 PM
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Dynamat Fail

I recently installed dyna-mat on my 110. This is just my 2 cents on the results of the install for anyone considering throwing down the cash to dynamat their roof. BLUF: based on data collected, it isn't worth it to dynamat your roof for sound purposes alone. I ordered a set of 9 18"x32" in a bulk pack from amazon. It covered the whole roof except for about 4 square feet of the roof in the rear of the truck.

I conducted multiple in-truck decibel readings prior to install. I did not expect sound reduction below 50MPH, but I did expect at least some reduction in wind noise at highway speed. Decibels prior to installation were 88-90 at 60 MPH. After install there was zero reduction in recorded wind noise. 'Feel' in the truck reflected the data... I felt no notable decrease in cabin noise at highway speeds.

Next step will be the bulkhead, doors and seat box. I expect some reduction in road/engine noise with these upgrades. This upgrade has dropped in priority after seeing how little it helped on the roof.


Other data, by average:

In truck with engine off: 43 decibels
Idle: 75 decibels
45 MPH: 80 Decibels
55 MPH: 88 Decibels

Max decibels: 94
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  #2  
Old December 22nd, 2012, 03:09 PM
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What were you trying to accomplish with dynamat on the roof? It partially mitigates vibration in body panels (drum effect), but does little to nothing to block or absorb errant sound. Acoustical foam will absorb errant sound while dense mats are designed to block sound transmission. Different tools for different jobs.
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  #3  
Old December 22nd, 2012, 03:12 PM
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The reverberating drum effect of my rolling tin can was what I was trying to help.
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  #4  
Old December 22nd, 2012, 03:28 PM
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I added 5692t49 @ Mcmaster.com, stem to stern and then put in the headliner. I too found that dynamite by itself did little, because all of the errant noise just bounced around. After the acoustical foam, it was way better. How are your door seals? Are there any holes in the bulkhead (either rust or open bolt holes). Pin holes can let in a surprising amount of sound. Are there effective gaskets/strip caulk seals for all of the floor plates?
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  #5  
Old December 22nd, 2012, 03:35 PM
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Dynaliner

I went with a base of Dynalmat and then 1/4" Dynaliner on the roof and bulkhead. On the floor I had carpet made with thick backing. Still in process but I can already feel the difference.
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  #6  
Old December 22nd, 2012, 03:47 PM
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I feel with the diesel the largest improvement would be with the front floors and bulkhead
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Old December 22nd, 2012, 04:02 PM
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As a cheap ass and loving to DIY things - I have conducted tests and found that "Grace Ice and Water Shield" 2 layers thick works as well and possibly better that Dynomat extreme. And at a FAR lesser cost. God help you if you ever have to remove it, a good and bad thing. Good in that it won't allow water under it to fester but bad in that it's a bitch if you need to remove panels.

Also it is ONLY good as a base layer and needs to be topped with foam decoupler of some sort to really get a noticeable effect. (This is why it often helps inside doors or under carpet - you need another layer to block the sound transmission)
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  #8  
Old December 22nd, 2012, 05:16 PM
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Quote:
Originally Posted by FSU_Disco View Post
I feel with the diesel the largest improvement would be with the front floors and bulkhead
What he said. When I did my roof, I did add some rectangles in the center of each large roof section to dampen the noise, but I new my noise issues where not coming from above. My focus on the roof was in thermal insulation, and that is what I did to the whole length of the roof. I used Second Skin insulation and it made a HUGE difference in the effect of A/C in the summer and keeping in heat in the winter.
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  #9  
Old December 22nd, 2012, 06:27 PM
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http://www.mcmaster.com/#standard-fo...lation/=kpipbz I recommend 5692T14, which is non-adhesive backed, but I have a prejudice against adhesives on the Defender
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Old December 22nd, 2012, 06:36 PM
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Agree with everything said thus far
Dynamat alone will not do enough. I did the entire roof and its hard to tell if Dynamat alone helped with noise because I'd been rolling around with no headliner for a year and installed the headliner at the same time as I installed the Dynamat. There was a noise reduction, but not as much as I thought I'd observe. I had also added a thin layer of 1/8" foam on the headliner before headliner fabric. Don't know if that helped, I was not that scientific about it.

When I was doing some work over the past week, I had removed the rubber matting over the transmission tunnel and part of the bulkhead and the noise increase was DEAFENING! Noise back to normal when I reinstalled the OEM rubber matting. I agree with others who suggest that the FLOOR, not the roof is the answer in terms of cutting the noise.

I do not want to Dynamat the floor or inside of bulkhead as it would be ridiculously hard to make any repairs. Likewise, Dynaliner would do a great job, but I really want something that you could remove occasionally so I can hose out/vacuum out the floors.

I'm researching heavy duty 1/2 - 3/4" rubber matting that can be cut for the floor and will hold a shape and run up the inside of bulkhead. I've already got the tunnel and center section of the bulkhead around the fuse panel covered. I don't think spending $$$$$ on HD load mat is what I want to use, but something of that type, but maybe thicker?

Also plan on looking through McMaster for some engine bay liner for under the bonnet and in the engine side of the bulkhead.
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  #11  
Old December 22nd, 2012, 06:40 PM
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More pics

Don't know why I can't post more than one pictur at a time with iPad?
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  #12  
Old December 22nd, 2012, 06:42 PM
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Quote:
Originally Posted by sonoronos View Post
http://www.mcmaster.com/#standard-fo...lation/=kpipbz I recommend 5692T14, which is non-adhesive backed, but I have a prejudice against adhesives on the Defender
Exactly!
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  #13  
Old December 22nd, 2012, 07:22 PM
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Quote:
Originally Posted by Jackie Treehorn View Post
When I was doing some work over the past week, I had removed the rubber matting over the transmission tunnel and part of the bulkhead and the noise increase was DEAFENING!
I experienced the same thing.. It made me glad I didn't get an ex-mod truck.
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Old December 22nd, 2012, 07:48 PM
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I would thing doing nothing with the support channels on the roof would lessen the reduction. Has anyone injected foam or anything of the like into those hollow channels?
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Old December 22nd, 2012, 07:54 PM
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Quote:
Originally Posted by Bill Larson View Post
I would thing doing nothing with the support channels on the roof would lessen the reduction. Has anyone injected foam or anything of the like into those hollow channels?
From a noise perspective, probably great....
From a rust perspective, probably not so much (imagine how that would hold moisture)
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  #16  
Old December 22nd, 2012, 08:08 PM
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Quote:
Originally Posted by ontheway View Post
I experienced the same thing.. It made me glad I didn't get an ex-mod truck.

recently released exmod trucks have the killer wright offroad sound matting sold by exmoor
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  #17  
Old December 22nd, 2012, 08:13 PM
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Quote:
Originally Posted by 130Tdi View Post
recently released exmod trucks have the killer wright offroad sound matting sold by exmoor
I recant my previous statement.
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Old December 22nd, 2012, 08:20 PM
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McMaster Carr is where it's at!!!!!
Could spend all night ordering stuff.
Definitely ordering some of that sound material.... And the stuff for under the bonnet

To bad it's too late to make it on Santa's sleigh
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Old December 22nd, 2012, 08:38 PM
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This one needs a bunch of soundproofing!
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  #20  
Old December 22nd, 2012, 10:29 PM
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Haha look at that, you spotted me. And as usual my truck was one of the last ones in the parking lot.
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