Dynomat in a Jeep?

REDLYNER

REDLYNER

Mall Crawling Race Rig
Joined
Oct 31, 2008
Location
Mountain Island
Does it make a difference? I’ve drilled a hundred holes in my tub over the last 15 years as my Jeep has evolved, just curious if it’s worth $130 or so and a few hours of work to cover the entire floor board with it.

I have the race jeep all apart for some interior upgrades (and a repaint) and thought I would line it with some dynomat while it was easy to access.

Looking to hear some exeperiences!

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What ^ said. Dynomat would be good if you had a fully enclosed Jeep & carpet (hard top, doors) but you'll have enough sound coming from under the hood, don't think it'd be beneficial. I'm not sure what lizard skin is, but I'd guess it's closer to rapor lining/line-x.
 
The main problem I see with it is moisture when you clean it. With all the holes underneath to let crud in from the bottom and when you clean it from the top. It's just a way for more rust to start Imo. I don't have any advice about it working well or not.
 
RatLabGuy said:
What are you wanting to get out of it? Sound absorption? Heat attenuation? Look cool?
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We drive it all over charlotte, just trying to enjoy the road a little more. So basically: yes.

Sound absorption, heat attenuation, aesthetics.
 
No personal experience, but I'd probably try to weld up / patch the extra holes as much as possible then spray something like lizard skin.
 
I know money means nothing to you.... but people also go to the hardware store and get HVAC insulating sheets that stick and use them instead of dynomat.
 
Folks have been using Peel N Seal as a substitute to dynomat for sound deadening for ages...and it's 1/3 the cost. And it's been proven several times on the innerweb to come pretty close to the same db reduction as well. You don't need to cover the floor with the stuff, there comes a point of diminishing returns...but won't hurt. As for heat, I'd sooner get one of those at home roll on bedliner kits.
 
I don't see the dynomat doing anything for sound. We've had jeeps with and without carpet. 99% of the noise comes from the top. Regardless, it's intended use is for panel deadening. If you're looking for sound isolation, go with MLV. More performance, less monies, just not in this application.

Likewise, I don't see it doing much for heat transfer. Bed liner, maybe. I'd just run the air conditioning and throw some rubber floor mats in it.

Edit: Weld up those big ass holes in the transmission tunnel. All sorts of racket is going to come through there.
 
UTfball68 said:
Folks have been using Peel N Seal as a substitute to dynomat for sound deadening for ages...and it's 1/3 the cost. And it's been proven several times on the innerweb to come pretty close to the same db reduction as well. You don't need to cover the floor with the stuff, there comes a point of diminishing returns...but won't hurt. As for heat, I'd sooner get one of those at home roll on bedliner kits.
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The wife doesn’t care for the roll on stuff. I understand this is A Jeep that has been trimmed and sliced for weight savings etc, so I don’t have enormous expectations. I’m trying to civilize it juuuust a little bit and I’m adding a 3rd seat for my son.

Sounds like I shouldn’t expect much on the noise side but maybe benefits on the heat shielding?

As far as water getting out, I was planning on cutting out holes in the mat where the stock TJ drain plugs are. I wonder if that will be enough to prevent standing water?
 
REDLYNER said:
I’m trying to civilize it juuuust a little bit
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If that's the case, I plan on doing my Bronco in Grizzly Grip...it's an aliphatic bedliner instead of aromatic...so fade shouldn't be as much of an issue. Different textures and tintable if need be. Spray on or roll on. I haven't seen any feedback on sound deadening or dropping temps...but I'm going to assume it's similar to any other roll on liner:

Grizzly Grip | Truck Bed Liner Bedliner Color Camper Top Repair Non Slip

Grizzly Grip | Truck Bed Liner Bedliner Color Camper Top Repair Non Slip
 
Get a thermal control product, and don't worry about the noise reduction. The single floor pan plane is not going to help much for noise.
Reducing floor pan temperature a useful amount is fairly simple, and you might want to think about localized radiant barriers under the pan (exhaust areas) and on the firewall instead of just stuffing a bunch of heavy elastomer or mastic all over the interior floor. Dynamat weighs a lot, which is how it works (it's a mass damping product). Bed liner won't help with heat more than a small amount; it's too thin and dense.
 
a_kelley said:
Carpet & padding is an excellent sound dampener. Get some that's pre-cut with the backing attached. Throw in for DDing. Remove for fun.
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Not a bad suggestion, just tried that experiment over the last 3 months and the wife and I concluded this weekend that it failed. The carpet has to be trimmed a ton to fit around the cage and center console and ended up crinkling and bunching up.

Falco- I may end up doing just that (localized), then respray the interior with OEM stone white paint and some Quadratec rubber mats.
 
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I did offbrand Dynomat in my Cummins. Worth the $59 in stuff for the sound it cut down from the G56 with dual disc trans rattle. But you'd need to cover it with something else or it'd probably start getting peeled up and become a sticky mess.
 
I went ahead and repainted the roll cage and ordered 80sq/ft of HushMat. It will be a $150 experiment, so if it works, others will know. If it is a disaster, others can save their time and money.

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The Nascar boy have done a lot with materials to keep the Driver from burning their feet. Don't know what they use now, & sometimes it doesn't work. But That would need some type carpet or cover it. As for Sound, that doesn't matter, under the Closed Helmet, with ear plugs!
 
Update on the progress: HushMat is thinner than Dynomat, but it was great to work with. In the middle of a massive interior renovation for the race jeep, so I haven’t driven it yet to check road noise and vibration dampening. I’ll throw some Quadratec floor mats up front next week.

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Me too. That looks like it'll be a nice permanent greyish-tan color after a romp in the woods.
 
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