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Posted by: jack20 Feb 7 2015, 12:02 AM

Hello,
Has anyone used Dynamat on the inside firewall below the black base layer pad? If so, did it make a noticeable difference in noise reduction? Any suggestions for most effective use of this product?
Thanks,
Jack

Posted by: 914runnow Feb 7 2015, 12:08 AM

hi there..you mighttah pushed the wrong forum button..
try the garage..tons of answers there..

Posted by: jack20 Feb 7 2015, 12:28 AM

Rookie mistake. Thank you!

Posted by: boxstr Feb 7 2015, 11:52 AM

Amazing difference. I used a product called fat mat, which I beleive was purchased by Dynamat. It sold for considerably less and was the same stuff.
You might want to consider using it in the doors and floors. Even a piece in the targa roof panel will help.
There are many other products just like Dynamat out there. Prices can be all over the place. Good luck.
Craig at CAMP

Posted by: Bossman Feb 7 2015, 12:04 PM

I have used this product on many projects. Makes a big difference. I would also put some in both trunks and under both trunk lids. Takes out the resonating tones. You will actually hear your engine with out all the static "buzzing".
The down side of course is weight, but if you are concerned about acoustics you are obviously not building a racer.
You could take it a step further with a layer of of closed cell foam over the dynamat topped with a layer of mass load vinyl (MVL), but with the thin glass and frameless windows you probably wouldn't notice this extra effort
Sometimes you can find a shop selling a package of scrap pices pretty cheap on eBay that you can fit together

Posted by: boxstr Feb 7 2015, 10:32 PM

Amazing difference. I used a product called fat mat, which I beleive was purchased by Dynamat. It sold for considerably less and was the same stuff.
You might want to consider using it in the doors and floors. Even a piece in the targa roof panel will help.
There are many other products just like Dynamat out there. Prices can be all over the place. Good luck.
Craig at CAMP

Posted by: pete000 Feb 7 2015, 10:35 PM

Good stuff, many cheaper alternatives out there. The good is is makes the car quiet and solid feeling, the bad it is not so light and a bit pricey.

Posted by: 914forme Feb 8 2015, 08:05 AM

copied this post from another site. you can also get this in big rolls at comercial roofing supliers.

"Peel & Seal is the cheap alternative to Dynamat. This is the stuff you get from Lowes Hardware. It is the same as the original Dynamat but a lot cheaper.
It's very, very close to Dynamat other than the price. It has a 40 mil rubberized aspalt sticky back, two layers of high stregth polymer film over a reflective aluminum surface."

The Peel & Seal comes in small rolls, but it works. You can find it in larger rolls from a roofing supplier.

You can also look for a product called http://www.polyguardproducts.com/products/Mechanical/alumaguard.htm We use this stuff on outdoor chillers at work. Tough as nails, and will deaden sound. Oh and its cost is about a $1 a square foot wholesale.

And http://www.lobucrod.com is a little more but I have used it before!

Posted by: Vacca Rabite Feb 8 2015, 09:38 AM

I used Fatmat on my car. 2 layers on the firewall.
The sound of carbs creaming at 4K+ RMP cuts right through the rear window, but a lot o road noise is cut down.

Zach

Posted by: a914622 Feb 8 2015, 11:04 AM

I have use a similar product on both the vanagon and the toyota. Good for removing vibration noise.

Stay away from the roofing material. On a hot day your rig will smell like a freshly tared roof. Mc Carr has sheets that are cheaper than the stereo shops.

Jcl

Posted by: larryM Feb 8 2015, 01:20 PM

X2 - and see this - http://www.914world.com/bbs2/index.php?showtopic=159216

a stock firewall pad weighs 35 lbs - & assists in rusting

- I use similar DEI product on my 914-6 & several other cars - shop Summit Racing for it

Posted by: mepstein Feb 8 2015, 01:52 PM

The stock firewall pad (interior) on my '75 weighed 9lbs

Posted by: malcolm2 Feb 8 2015, 02:16 PM

I used B-Quiet Ultimate behind the seat, and all over the floor. Folks also stick a square on the inner door. Some people do the same on the inner lid of the trunks. It absorbs vibration and reduces the noise. It works.

In my case it was not much work. I already had the car stripped and the original tar removed.

Posted by: ellisor3 Feb 8 2015, 04:10 PM

Dynamat is a butyl based product where peel and seal is asphalt based. The asphalt will not work well on vertices surfaces as when it heats up the adhesive is likely to fail. Also asphalt may ooze when it gets hot. Not good. But may work ok on flat horizontal surfaces like floors.

Other options are Lizard skin or B Quiet and EZ Cool.

Posted by: wes Feb 8 2015, 08:25 PM

I used Dynamat on the interior doors, floors, and inside firewall and yes $$, lbs but I like it.
Now I see AA has a Dynamata engine compartment firewall insulation pad that clams to look like the OEM pad and Im wondering if any one has tried it?

Posted by: larryM Feb 8 2015, 09:01 PM

good for you! - mine weighs 35 lb

- still in bag in storage if anyone wants it for free - local pickup

or pay the shipping cost on actual weight

.

Posted by: bigkensteele Feb 8 2015, 09:30 PM

I think that the interior pad is probably around 10#. The engine compartment pad is MUCH heavier, so between the two of those and the tar that is scraped off the floor, adding Dynamat or an equivalent will probably still be lighter.

Posted by: tomeric914 Feb 8 2015, 09:49 PM

I've use Dynamat in the past but switched to Second Skin Damplifier and Damplifier Pro and had much better results. As Vacca Rabbit has stated, the back glass is where a lot of the sound comes through but this will help.

http://store.secondskinaudio.com/damplifier-pro/

I also like their Spectrum noise control coating for the floor if the tar boards have been removed. Goes from tinny to thud in one coating.

Posted by: carr914 Feb 9 2015, 06:12 AM

I've used Fat Mat, DynaMat & DynaMat Lite. I like the Lite best - it's easier to use.

Dont Ever Use the Aspalt Roofing Products - I have seen the Asphalt melt and the Smell - damn!