Sound deadening etc...

[RM1SepEx]

So, my FatMat is almost complete, I'm sticking it on every aluminum surface and the steel footwell. I plan on using carpet on the footwell and dead pedal and high grade vinyl on the vertical surfaces with a thin foam backing and velcro to hold it in place.

I finished my driver's slider today! Under my seats I'm looking at how to finish those triangular areas... One option is to fill the triangles with foam and cover it with a thin aluminum sheet or cover it with vinyl.

Thoughts? What are others going to do? I want to get this buttoned up under the seats so I can do my first go kart and not pull the seats again to finish under them.

[Bob_n_Cincy]

I finished my driver's slider today! Under my seats I'm looking at how to finish those triangular areas... One option is to fill the triangles with foam and cover it with a thin aluminum sheet or cover it with vinyl. .

I never thought about this till now. My first thought is to drop in carpet triangles.
I am going to leave holes in the corners to let water drain out. I remember my 64 convertible. About once a month it would rain unexpectantly.
Bob
23415

[Frank818]

Interesting, Ontario plate. :)

[RM1SepEx]

It seems a waste to put carpet under the seats in the triangles. I'd like to maximize light weight sound deadening. I could fill the triangles with 1 inch foam and cover with vinyl Right now you can read FatMat from any angle ! :-)

I did start it again today and made it inch back and forth on the lift... Temping to just toss the seat in and do a short spion

[Bob_n_Cincy]

Interesting, Ontario plate. :)
I should fess up. This picture is a restored car exactly the same as mine. Back in 75-81 mine never looked this nice. I sold it to a friend that did restore it.
Bob

[Frank818]

I thought so, Bob. :) Good ol' classic car, though!

[AZPete]

I'm interested in the suggestions, too. The under-seat space is asking for insulation.
Also, I have made an aluminum panel for the lower back of the rear firewall - between the headers and the gas tank. What should I fill the 1.5" space with to reduce noise and heat?

[Xusia]

I'm definitely planning on some type of sound deadening treatment. I recall hearing about a coating (spray on, like paint I think) that protects, reduces vibration, and deadens sound, and is probably the route I'll go. Does anyone remember the name of the product? I can find it, but if someone knows it, that will save me some time.

I like the idea of a coating as opposed to a material for a couple reasons: 1. It's cheaper overall; and 2. It helps reduce the possibility of mold.

[RM1SepEx]

I pulled apart the crap under the carpet of an old Miata... UGH the jute was indeed mold ridden after 20 plus years. I scraped and wire brushed the pan and used FatMat before I replaced the carpet. I don't see how I'm going to have such a problem with the FatMat. It's rubber and reflective aluminum foil. I just don't want to see the FatMat logo all over... I could paint it over with bedliner or spray it with some sort of rubberized coating

[Barrel]

Are you thinking Lizard Skin? I have used it on my aluminium panels and when you knock on them they sound like thick cardboard. But it's far from cheap.

[Xusia]

Lizard Skin is what I was thinking of. If I recall correctly, it's far cheaper per square foot than Dynamat.

What's your impression of the product? Are you happy with the results? Would you use it again?

[Barrel]

Xusia. Have sent a PM.

[Canadian818]

I picked up some Eastwood Thermo-Coustic sound deadener, it was on sale. Not sure how it compares to everything else out there, but i don't plan to use a lot of it. Reviews seem 90% positive with the occasional really negative comment saying it dripped and "pooled" but I couldn't find a single picture of proof. Anyone use it before?

[Xusia]

After doing a ton of research, I bought this stuff: http://www.hytechsales.com/prodsc.html

Significantly cheaper than Lizard Skin, and arguably a tad superior. The lady I spoke with was very helpful and said that compared to "normal" mixes, the SC1000 (accoustic variant) had more of the ceramic modules suspended in a more rubbery paint. Sounded good to me, and the price was decent, so I bought 2 gallons.

Oh, she also said it COULD be applied with a normal air sprayer; you just need to remove the filter.

[Frank818]

Xusia, this is what you got?

SC#1000 Super Hi-Build Thermal/Sound Supression Coating
1 Gallon: $59.95...5 Gallon: $299.75

[Oppenheimer]

Back before the 818 was released and we filled the time discussing odd subjects, someone with high-end sound experience posted about how its important to use the right mix of sound deadeners. That stuff like dynomat is could for deadening that tiny panel sound, but that you only need a patch of it in the center of large flat panels. No need to cover every inch. Also much lighter that way. Then he went on to describe the other products you need to complete, that there are 3 types of sounds you want to arrest, and dynomat type is only good for one of those. Seeing if I can find that thread...

[Oppenheimer]

Found it. See post #5 (and beyond)

http://thefactoryfiveforum.com/showthread.php?7948-Additional-layers-of-insulation&highlight=dynomat

[Xusia]

Frank, yes. That is the one. It has not arrived yet, but I will be sure to report on it as soon as I know anything. I realize others are probably waiting on information to make their own decisions in this area.

Opp, I remember that thread! I was thinking about it when formulating my sound deadening plans. I liked the methodical approach, but thought it a bit impractical for me. The only real chance in my plans as stated in that thread is the use of the paint rather than Dynamat. That's simply a function of cost and form. That is, coating the panel is a bit better than applying a piece of Dynamat because it's evenly coated so carpet could be applied easily over the top, and it provides a layer of protection. I realize I could find ways to make Dynamat work, the SC1000 just seemed a lot easier and good enough for my needs and where I plan to start. If it's not good enough (i.e. quiet enough), I plan to add EZ Cool under the carpet and on the inside of the firewall, more as a decoupler than as a heat barrier (but additional insulation probably won't hurt!).

[dougkirkbride]

Frank, yes. That is the one. It has not arrived yet, but I will be sure to report on it as soon as I know anything. I realize others are probably waiting on information to make their own decisions in this area.

Opp, I remember that thread! I was thinking about it when formulating my sound deadening plans. I liked the methodical approach, but thought it a bit impractical for me. The only real chance in my plans as stated in that thread is the use of the paint rather than Dynamat. That's simply a function of cost and form. That is, coating the panel is a bit better than applying a piece of Dynamat because it's evenly coated so carpet could be applied easily over the top, and it provides a layer of protection. I realize I could find ways to make Dynamat work, the SC1000 just seemed a lot easier and good enough for my needs and where I plan to start. If it's not good enough (i.e. quiet enough), I plan to add EZ Cool under the carpet and on the inside of the firewall, more as a decoupler than as a heat barrier (but additional insulation probably won't hurt!).


xusia - please report - i am looking for something i can roll on, this appears to be rollable. the only thing i dont like is that its off white. can it be tinted?

[Kalstar]

This is what I used on my GTM.

https://gtsoundcontrol.com/shop/GTmat-liqui-damp-Car-Audio-Sound-Deadener/

Took little more then a quart to do the whole interior. Very light weight, easy to use and extremely cost effective. I painted it on with the supplied brushes. Very happy with the results.

[Frank818]

Kalstar, I think it's the first time I see this one. So it was easy to apply, dries fast too? Can you apply other stuff on top of it once dry, like vinyl wrap, carpet or anything like that?

And according to you, it does reduce decibel levels in an "acceptable" way?

[Kalstar]

Kalstar, I think it's the first time I see this one. So it was easy to apply, dries fast too? Can you apply other stuff on top of it once dry, like vinyl wrap, carpet or anything like that?

And according to you, it does reduce decibel levels in an "acceptable" way?

Yes dries fast (few hrs) and rises a bit while drying. Can be rolled, brushed or sprayed. I have foam on my center tunnel (knee padding) and carpet on the floors, the spray adhesive sticks to the sound deadener like it was meant for that purpose. Vinyl wrap would be impossible as this stuff dries with a slight texture. Where I wrapped I did the sound deadener on the underside.

As for sound, does little for the deep base of the exhaust but takes all the tin sounds and rattles away. It really is amazing the difference it makes when you take a wrench and tap on a treated panel opposed to an untreated. I have a mpg somewhere where I tapped both panels on a cell phone vid and the difference was quite remarkable. My guess is I added about 4 lbs total weight and in my opinion very well worth the little added weight. I have had the GTM on the road for a year now (about 2000 miles) and am very happy. So much so that this is the product i am using on my 818 as well.

[Frank818]

Great, I'm sold! That's the type of review I was waiting for.
I want to keep the deep frequencies, but not the other ones.

Now let's see if I can easily get some shipped cross-border...

Tnx a lot for sharing the info!

[Frank818]

Great stuff, it's also sandable and paintable. And they sell sheets as well on rollers, up to 80mil thick.
I may take a combination of both and yes they ship overseas.

[flynntuna]

Looks like a good solution, how does it compare to other products like Lizard Skin?

[Kalstar]

I used Lizard skin on the trunk and doors of my old Camaro. The Liqui-damp was far easier to use and much less money. For which works belter... I can't say for sure as they are two different animals of cars but I would say they are both designed for the same purpose and I was happy with both.