View Poll Results: Your thoughts on Dynamat (or similar product)

Voters
9. You may not vote on this poll
  • Made a big difference. I love it.

    4 44.44%
  • I used it but Im not impressed, would not use again.

    2 22.22%
  • Dont need it, its a muscle car, I dont care if its loud.

    2 22.22%
  • I wanted it for better audio experience, stop rattles, etc.

    1 11.11%
  • Other...please comment below

    0 0%
Results 1 to 18 of 18
  1. #1
    Join Date
    Jan 2009
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    Hermosa Beach, CA
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    Dynamat. Is it worth it? Pros/Cons

    For a 68 Camaro: Wondering what everyone thinks about Dynamat sound deadening (or similar product)? How many boxes are needed for average car? Where are people putting the Dynamat? What types are there, thicknesses, materials, etc.? What are results, did you notice a difference? How much weight does it add to do a car? Any help is appreciated. Thanks.

    Pete

    1968 Camaro
    2009 Porsche 911 Carrera S

    http://www.cardomain.com/ride/2543199


  2. #2
    Join Date
    Sep 2016
    Location
    Bakersfield, CA
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    246
    Country Flag: United States
    I have a very loud exhaust and love it that way (FM 10s that dump in front of axle) so I used it inside my car. I have it all over the entire floor and halfway up the firewall. Also on the inside of the roof. With the windows up, you can hold a nice conversation like a new car. Absolutely worth it.

    If I had to do it again, I would also add it to the door skins and especially in the trunk!

    I wish the thermal barrier properties were better tho. I still get a fair bit of heat from the firewall and console area. I'm going to be adding DEI reflect-a-gold to the inside of the trans tunnel next week to help.

    There are lots of different types so choose the one to address what you are concerned with most (noise, vibration, heat, etc).
    http://www.TheFOAT.com/92GTA
    1969 Pontiac Firebird
    w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black w/black interior.
    1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.

  3. #3
    Join Date
    Nov 2008
    Location
    Milwaukee, WI USA
    Posts
    424
    Country Flag: United States
    I used Dynamat Extreme: I put it in my doors(a couple of strips on the inside of the outer skin) and used it as the watershield under the door panels.
    The doors now close with a "thud". That was a huge difference.
    I also put it on the ceiling, floors, and behind the back seat.

    Some guys put it in the trunk area, but I don't think it is really needed there.

    BTW: the cheapest prices I found were on Amazon.com
    1969 Camaro SS, 350(NOM), M21, 12 Bolt Posi, 01B (Jan 69) LOS Build

  4. #4
    Join Date
    Apr 2009
    Location
    Michigan
    Posts
    126
    Country Flag: United States
    I bought some off-brand "Dynamat" from Amazon and ended up shipping it back for one reason - the weight. There are different thicknesses available, but generally, the thicker it is, the better it works. I see a lot of people saying they used 3+ bulk packs of Dynamat in their car. 3 bulk packs = 108 square feet * 0.68 pounds per square feet (for original Dynamat) = 73 lbs of added weight.

    For the way I use my car (nice day cruiser, windows down, usually not long distance), it wasn't worth it to me.

    Everybody brings up https://www.sounddeadenershowdown.com/ in these threads, and I think it's for good reason. There are more effective, weight conscious ways to limit noise than the "big stick" approach of covering everything in Dynamat, but it requires more work and more thinking. As always, I recommend looking to the OEM's, not the aftermarket, for the most balanced solutions. When you lift up the carpet of a new BMW (or Cadillac, or Mercedes...), you don't see layers of butyl rubber.
    - Ryan

  5. #5
    Join Date
    Apr 2006
    Location
    Huntington Beach, CA
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    2,323
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    I used a competitor product to Dynamat (second skin) which was rated highly. It works for its intended purpose but overall I don't think it makes a huge difference.

    I previously had my firewall covered the floor covered 100%, the out door skins covered, the rear quarter skins covered, even used some on the rear package tray and seat back supports. Basically covered it everywhere except the trunk and ceiling. I've since removed it from the doors, quarters, package tray and parts of the floor. I also removed all of the second skin sound insulating foam. I did it to save 10-20 lbs in weight and was shocked at how little difference I noticed after removing so much of it.

    I can still listen to my stereo and make calls on bluetooth through my stereo. Much more of the noise coming into the cabin is from the poor window design, exhaust and a bit of rear gear whine which it didn't do much for.

    If building a pure street car that you want to make as comfortable as possible I think it's probably worth it. But for a car that you are also trying to make perform as well as possible on autocross or the track in addition to street driving, I don't think its worth it.

    For sound deadening, I'd also recommend installing it correctly, which means not applying it to cover 100% of the panel.

  6. #6
    Join Date
    Sep 2016
    Location
    Bakersfield, CA
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    246
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    Quote Originally Posted by Chad-1stGen View Post
    For sound deadening, I'd also recommend installing it correctly, which means not applying it to cover 100% of the panel.
    Absolutely this. I see a LOT of people doing it incorrectly with sound deadening.
    http://www.TheFOAT.com/92GTA
    1969 Pontiac Firebird
    w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black w/black interior.
    1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.

  7. #7
    Join Date
    Aug 2015
    Location
    charlotte
    Posts
    614
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    Quote Originally Posted by anguilla1980 View Post
    Absolutely this. I see a LOT of people doing it incorrectly with sound deadening.
    To second this, I've also learnt to not cover everything 100% and applied it that way in the past, But EVERY top-end shop I see building cars(instagram mostly), whatever it's purpose, continue to do 100% coverage and I'm unsure why?
    Unless they're sponsored by the sound deadening company perhaps

    When I'm at a crossroads in my build, I've got a bit of the attitude where I think "what would Detroit speed or roadstershop do?" hence why I used raptor liner on my floors initially. But this is one baffles me a little.

  8. #8
    Join Date
    Oct 2018
    Location
    San Jose, CA
    Posts
    460

    Dynamat. Is it worth it? Pros/Cons

    So I have the entire floor and firewall covered on my 71 Camaro. Really helps with heat more than sound. Itís a loud car. But now with the T56 Iím cruising 75 at 2200 so itís pretty quiet but I normally also have the windows open. But the heat reduction is the big win. This is a 520hp motor so it makes some heat. Itís comfortable in the cabin. Even did a 3-4 hour drive mostly stop and go in 90deg+ temps this summer. Fried a MSD but we were doing fine in the cabin.

    Now - I also have a 2016 convertible and added an exhaust system. It has some drone so I thought maybe try some sound deadening. I covered probably 75pct of the trunk area which had nothing from the factory. Wow. Made a huge difference in sound. Drone is all but gone. And itís way quieter overall with the top up now especially on the highway.
    I used a cheaper brand too. Forget which one. Found it on amazon. Worked great !
    1971 Camaro - 406 / T56
    2016 Camaro SS convertible
    2018 Colorado 4x4

  9. #9
    Join Date
    Aug 2015
    Location
    charlotte
    Posts
    614
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    Quote Originally Posted by c4racer2 View Post
    So I have the entire floor and firewall covered on my 71 Camaro. Really helps with heat more than sound. Itís a loud car. But now with the T56 Iím cruising 75 at 2200 so itís pretty quiet but I normally also have the windows open. But the heat reduction is the big win. This is a 520hp motor so it makes some heat. Itís comfortable in the cabin. Even did a 3-4 hour drive mostly stop and go in 90deg+ temps this summer. Fried a MSD but we were doing fine in the cabin.

    Now - I also have a 2016 convertible and added an exhaust system. It has some drone so I thought maybe try some sound deadening. I covered probably 75pct of the trunk area which had nothing from the factory. Wow. Made a huge difference in sound. Drone is all but gone. And itís way quieter overall with the top up now especially on the highway.
    I used a cheaper brand too. Forget which one. Found it on amazon. Worked great !
    NOICO by chance?

  10. #10
    Join Date
    Jan 2014
    Location
    Portsmouth NH
    Posts
    120
    Country Flag: United States
    Does anyone have any experience with Flatline Barriers?
    1969 Camaro

  11. #11
    Join Date
    Oct 2018
    Location
    San Jose, CA
    Posts
    460
    Quote Originally Posted by slimjim View Post
    NOICO by chance?
    yes that was it - 80mil

    worked great and was reasonably priced.
    1971 Camaro - 406 / T56
    2016 Camaro SS convertible
    2018 Colorado 4x4

  12. #12
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    Aug 2015
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    charlotte
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    Quote Originally Posted by c4racer2 View Post
    yes that was it - 80mil

    worked great and was reasonably priced.
    I've heard good things, they're the number one seller on Amazon, If I don't go with Membrane I'll probably go with Noico

  13. #13
    Join Date
    Oct 2018
    Location
    San Jose, CA
    Posts
    460
    Nothing bad to say about it. I have two types of Dynamat on my 71. Iíd say itís pretty equivalent.
    1971 Camaro - 406 / T56
    2016 Camaro SS convertible
    2018 Colorado 4x4

  14. #14
    Join Date
    Jul 2018
    Posts
    121
    Quote Originally Posted by slimjim View Post
    NOICO by chance?
    Quote Originally Posted by c4racer2 View Post
    yes that was it - 80mil

    worked great and was reasonably priced.
    Quote Originally Posted by slimjim View Post
    I've heard good things, they're the number one seller on Amazon, If I don't go with Membrane I'll probably go with Noico
    I did the Noico on my 68

  15. #15
    Join Date
    Aug 2004
    Location
    NJ
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    1,026
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    I'd like to know what the consensus is on applying this stuff to your car. Like others have mentioned, you don't need to cover every square inch of your car in the stuff, but why do we see it done like that in high end builds from well known shops?

    I'm all for saving weight, but how much do you really save applying it strategically to certain panels and sections as opposed to just blanketing the whole interior in the stuff?

    I think at the end of the day most of us just want to get rid of some resonance and for those with AC, just looking to eliminate some heat coming from the outside. I would never expect it to sound like a new luxury car inside, nor would I want it to!

  16. #16
    Join Date
    Oct 2018
    Location
    San Jose, CA
    Posts
    460
    Quote Originally Posted by John McIntire View Post
    I'd like to know what the consensus is on applying this stuff to your car. Like others have mentioned, you don't need to cover every square inch of your car in the stuff, but why do we see it done like that in high end builds from well known shops?

    I'm all for saving weight, but how much do you really save applying it strategically to certain panels and sections as opposed to just blanketing the whole interior in the stuff?

    I think at the end of the day most of us just want to get rid of some resonance and for those with AC, just looking to eliminate some heat coming from the outside. I would never expect it to sound like a new luxury car inside, nor would I want it to!
    Well - one thing if using on the floor if you donít cover the whole floor pan you will end up with lumps in the carpet. Probably you donít need it everywhere but itís easier to do that way and gives a nice smooth underpayment for carpet or other upholstery
    1971 Camaro - 406 / T56
    2016 Camaro SS convertible
    2018 Colorado 4x4

  17. #17
    Join Date
    Oct 2014
    Location
    DFW, Texas
    Posts
    372
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    Be sure to take a look at a variety of different NVH options as there is not one-size-fits-all solution here. While dynamat/butyl works quite well at low frequency noises, it does very little for high frequency noises [tire noise]. You would also want to take a look at something like mass loaded vinyl that is quite dense and offers some additional thickness for areas that aren't space constrained. Something like open cell foam hiding behind a headliner, inside wheel wells [exterior], etc will help combat high frequency tire noise.

    Having built my car with what I thought I knew, I would do a few thinks differently to help mitigate NVH across the entire spectrum.
    1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
    1976 Dodge D100 - Warlock
    2016 Subaru WRX - E30 Tune

  18. #18
    Join Date
    Jul 2011
    Location
    Nashville/ Tampa
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    Quote Originally Posted by slimjim View Post
    I've heard good things, they're the number one seller on Amazon, If I don't go with Membrane I'll probably go with Noico
    I just posted a pic in the other thread, but my Membrane came in today, and if nothing else it at least looks to be a rather elegant combo product. It certainly beats trying to manually stack different products. Hoping to get it installed after I get my heater delete panel in place.
    https://www.instagram.com/gen_v_lt1_chevelle/


    Do not buy anything from Frankie's Used Auto Parts. Ever.
    Chevelle ̶a̶l̶m̶o̶s̶t̶ ̶f̶i̶n̶i̶s̶h̶e̶d̶ L92/200-4r now Gen V LT1 and T56- https://ls1tech.com/forums/conversio...nvertible.html