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89 sound deadening

 
Old 06-04-2019, 11:14 AM
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AudioObsessions
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Default 89 sound deadening

I used to do car audio back in the day. One thing I really don't miss is putting down the sound deadening material. I know it's all worth it in the end but I forgot what a horrible pain in the butt this really is. This is the progress so far, and reflectix is next!


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Old 06-04-2019, 11:36 AM
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puterami
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Nice work. I did this recently to my Ranger pickup. Learned to wear gloves due to all of the small cuts on my fingertips.
Good work!
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Old 06-04-2019, 12:56 PM
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rblakeney
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I'd like to do this to my 89 one day. Did you think to take a decibel reading before this work? I'd like to see this if you did -- before and after.
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Old 06-04-2019, 01:32 PM
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Originally Posted by rblakeney View Post
I'd like to do this to my 89 one day. Did you think to take a decibel reading before this work? I'd like to see this if you did -- before and after.
I did not. Most of these companies claim that you're going to hear about a 30% sound difference. I've seen some people on here claim that it's 60% less than what they heard before. It's a Corvette so it will never be as quiet as a Cadillac, and I don't expect it to be. I'm not putting in a big stereo, this was one of those things where when the carpet was out I figured I might as well do it. Any reduction in sound will be better than nothing and I was hoping that this would also help to reduce the heat a little bit. By the time I get to sound deadener in there followed by the reflectix, I'm sure it will be much quieter than what it was before and it will have a lot less heat.
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Old 06-11-2019, 02:29 PM
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Reflectix is done! Way cheaper than the precut kits they sell online. Now I just have to foil tape the seams.
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Old 06-11-2019, 04:22 PM
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Looks really nice. What's the difference in the two materials?

How far up does it go on the firewall? I'm curious if you hear a reduction in front tire noise.
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Old 06-11-2019, 05:32 PM
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Originally Posted by rblakeney View Post
Looks really nice. What's the difference in the two materials?

How far up does it go on the firewall? I'm curious if you hear a reduction in front tire noise.
Kilmat is to deden the sound. Reflectix is to insulate against heat radiating into the cabin. It only runs about halfway up the firewall as I did not remove the sub dash to remove the black mat insulation installed at the factory.
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Old 06-11-2019, 09:08 PM
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im going to be doing this soon. Since you have a history with the stuff, I see you went with kilmat, how much difference really is there between the different brands? Ive read several different things but Im guessing a lot is probably personal opinion or advertising. Also how many sq ft did you use, that will make it easier for me to buy mine. How much more do you think the reflectix will help on the heat, doesnt the kilmat reduce the heat already?
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Old 06-11-2019, 09:26 PM
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Originally Posted by Blackcorvette_85 View Post
im going to be doing this soon. Since you have a history with the stuff, I see you went with kilmat, how much difference really is there between the different brands? Ive read several different things but Im guessing a lot is probably personal opinion or advertising. Also how many sq ft did you use, that will make it easier for me to buy mine. How much more do you think the reflectix will help on the heat, doesnt the kilmat reduce the heat already?
As far as difference between the brands, there is not much. Dynamat Xtreme is the most popular, I will say it is a little bit thicker than some of the others but not worth the price difference. I have used many different brands and yes you will get many different opinions. I have been doing car audio for close to 20 years, the kill Matt seems to be the best value for the money. I used 60 square feet. I ordered a 36 square-foot kit and a 25 foot square foot kit. As far as heat reduction it doesn't do very well for that. I did the reflectix because I wanted as much heat reduction as possible. You can buy the pre-cut kits online but I bought a 100 square foot roll of reflectix and used less than half of it. The role cost me $42, I would much rather spend that then almost $300. The only other thing I used was two cans of 3M spray adhesive. I may have a total cost of 60 bucks into it. To do this it is time consuming and tedious but I believe the end result will be a quieter cabin and cooler as well.
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