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Discussion Starter · #1 ·
Just starting on our new PM 136 and was looking for comments about which of these to use, Dynamat Superlite or Xtreme, and how much we will need for the PM 136 hightop. From reading the forums it looks like we only need to cover 25-50%. I'm also going to use thinsulate 600L for insulation.
 

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Just starting on our new PM 136 and was looking for comments about which of these to use, Dynamat Superlite or Xtreme, and how much we will need for the PM 136 hightop. From reading the forums it looks like we only need to cover 25-50%. I'm also going to use thinsulate 600L for insulation.
I bought the box that is $150. 36sf Xtreme

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Mass loading products like Dynamat are used to control resonance in body panels by adding weight to lower the natural resonance frequency to a value outside the audible range. They don't block or absorb noise especially lower frequencies (booming) because that is a function of material thickness. (noise wave length has to be less than material thickness). Thinsulate(TM) which is much thicker (1 3/4") controls resonance AND blocks noise AND provides thermal insulation.

You do not need Dynamat, Noico or Fatmat if you use Thinsulate(TM). This is a significant cost, effort, and weight savings. I know we can't convince everyone. Our customers who take this advice are very happy with the performance of the Thinsulate(TM) as a comprehensive solution.

https://youtu.be/cy7088RtB8E?list=PL6hY8o9nJCeIi609KTNQBpEvWPL1u96dZ
 

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Discussion Starter · #6 ·
Thanks Hein you saved me time and money! I already ordered the thinsulate from you a couple of days ago.
 

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Mass loading products like Dynamat are used to control resonance in body panels by adding weight to lower the natural resonance frequency to a value outside the audible range. They don't block or absorb noise especially lower frequencies (booming) because that is a function of material thickness. (noise wave length has to be less than material thickness). Thinsulate(TM) which is much thicker (1 3/4") controls resonance AND blocks noise AND provides thermal insulation.

You do not need Dynamat, Noico or Fatmat if you use Thinsulate(TM). This is a significant cost, effort, and weight savings. I know we can't convince everyone. Our customers who take this advice are very happy with the performance of the Thinsulate(TM) as a comprehensive solution.

https://youtu.be/cy7088RtB8E?list=PL6hY8o9nJCeIi609KTNQBpEvWPL1u96dZ
I'm guessing it isn't hurting to have the dynamat and I can tell you it alone quieted the van considerably. Maybe it isn't needed with the thinsulate but once the thinsulate is in if you think it needs it you're screwed. We're spending $20-35k or more on these vans. What's $150 and a few hours of time for the dynamat. It'd be hard to convince me that a van without it is more quiet than 1 with it.

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Hey hold on now. I spent $5700 counting the lowered bases and swivel I just bought, the Espar heater, solar, fan, cabinets, batteries, and even an awning. I did not use the sound deadener so perhaps that made up the $30,000 difference? I did use Polyisocyanurate and the van is much quieter. I may opt for some deadener on the wheel wells as they generate a lot of noise.
 

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I have to agree - using sound deader under/behind insulation and cabinets is nothing more than a waste of time and money. I put absolutely no sound dealer in my van. ;)
 

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Just my 2 cents;

The first thing that I installed was RattleTrap, https://www.amazon.com/gp/product/B003TUQLY2/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1.

As you can see from the pictures I covered the entire floor and wheel wells. It made a huge difference right away.

Adding Reflectix, the rubber floor mat that came with the PM, 1/2" plywood and carpet makes it really quiet.

The sides and ceiling are also insulated to about R13 with a combination of Reflectix, foam board and Denim insulation (UltraTouch).

Mike
 

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Hill, Bill and Lee say that lime green shag carpet the neighbor threw out glued to the wheel well's and if you put a resonator box around your wheel wells glue some to the inside of that too, it works. It has mass load, fiber and cheap.
 

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You wasted lime green shag carpet?? My remnant from 1981 is a precious commodity. Really. I use it for cat scratching posts. It was the only carpet I ever had that I liked.

And on topic, I've never regretted using Dynamat Ultra. I'll never know if it was necessary, but what if I hadn't and later wished I had??
 

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Whew- then I’m sort of “Normal” (for the first time?) and my total of $39,800 must put me in the top quartile. In my defense I did split for a new diesel adding $4,000 MSRP along with the conversion.
Lastly I have seen your electrical engineered van, Winston, and your conversion looks like $30K (a complement by the way)
 

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I did say “first time” Now on topic....... I have my rear wheel wells inside partially enclosed boxes and under the bed mattress and we store some stuff in there like bath towels, sandals, you know, extra crap. They are seldom full. Would one of these mass loaded sound deadeners make much difference? How about the front wheel wells? Anyone covered them or is what's there about all you can do. I have the van quieted enough so the tire noise is now the loudest sounds, unless a truck passes of course.
 

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3M Thinsulate (TM) SM600L Acoustic Thermal Automotive Insulation

Mass loading products like Dynamat are used to control resonance in body panels by adding weight to lower the natural resonance frequency to a value outside the audible range. They don't block or absorb noise especially lower frequencies (booming) because that is a function of material thickness. (noise wave length has to be less than material thickness). Thinsulate(TM) which is much thicker (1 3/4") controls resonance AND blocks noise AND provides thermal insulation.

You do not need Dynamat, Noico or Fatmat if you use Thinsulate(TM). This is a significant cost, effort, and weight savings. I know we can't convince everyone. Our customers who take this advice are very happy with the performance of the Thinsulate(TM) as a comprehensive solution.

https://youtu.be/cy7088RtB8E?list=PL6hY8o9nJCeIi609KTNQBpEvWPL1u96dZ
Hi how much 3M Thinsulate (TM) SM600L Acoustic Thermal Automotive Insulation is needed for 136 high PM? i want to put this on ceiling too .
and what type of glue is used ?
 
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