Interior noise mitigation
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From: South Carolina
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I installed 3M thinsulate behind both door panels. Trim the material to fit the backside of the panels and glue or tape in place. You will need some trimming around the unlocking rods and levers.
It removed some of the mid to higher frequency harshness.
3M SM400L
It removed some of the mid to higher frequency harshness.
3M SM400L
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Joined: Sep 2022
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From: South Carolina
When we started our search we were looking at Miatas, drove several, nice but too ordinary.
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I really hate it when someone asks a legit question, and you get stuff like if you want quiet buy a Lexus. Just stop. Who are you to decide what mods are acceptable.
You'll get themost bang for buck from doing doors. Then floors. Then trunk. Its tire noise, yours and the other cars around, that make the most noise (assuming you don't have a hella loud exhaust).
You can actually hear engine and other pleasant sounds better, since there isn't so much less pleasant sounds. Signal to noise ratio. Also hear stereo better and easier to have a conversation with passenger.
Do 25% coverage using dynamat type material. I used 40 mil Noico from Amazon. Divide large, flat areas into square areas, then cut a piece 25% of that area, and place product in center of square.
Then apply 3M Thinsulate at full coverage to back of door panel.
Dynamat type material doesn't block sound waves. It adds mass to change resonant frequency. Gets rid of that oil drum effect. Adding more than 25% coverage just adds weight and expense, doesn't make it any quieter.
Thinsulate does block sound waves. So needs to be applied at 100% to work.
You'll get themost bang for buck from doing doors. Then floors. Then trunk. Its tire noise, yours and the other cars around, that make the most noise (assuming you don't have a hella loud exhaust).
You can actually hear engine and other pleasant sounds better, since there isn't so much less pleasant sounds. Signal to noise ratio. Also hear stereo better and easier to have a conversation with passenger.
Do 25% coverage using dynamat type material. I used 40 mil Noico from Amazon. Divide large, flat areas into square areas, then cut a piece 25% of that area, and place product in center of square.
Then apply 3M Thinsulate at full coverage to back of door panel.
Dynamat type material doesn't block sound waves. It adds mass to change resonant frequency. Gets rid of that oil drum effect. Adding more than 25% coverage just adds weight and expense, doesn't make it any quieter.
Thinsulate does block sound waves. So needs to be applied at 100% to work.
Thread Starter
Registered User
Joined: Sep 2022
Posts: 617
Likes: 155
From: South Carolina
I really hate it when someone asks a legit question, and you get stuff like if you want quiet buy a Lexus. Just stop. Who are you to decide what mods are acceptable.
You'll get themost bang for buck from doing doors. Then floors. Then trunk. Its tire noise, yours and the other cars around, that make the most noise (assuming you don't have a hella loud exhaust).
You can actually hear engine and other pleasant sounds better, since there isn't so much less pleasant sounds. Signal to noise ratio. Also hear stereo better and easier to have a conversation with passenger.
Do 25% coverage using dynamat type material. I used 40 mil Noico from Amazon. Divide large, flat areas into square areas, then cut a piece 25% of that area, and place product in center of square.
Then apply 3M Thinsulate at full coverage to back of door panel.
Dynamat type material doesn't block sound waves. It adds mass to change resonant frequency. Gets rid of that oil drum effect. Adding more than 25% coverage just adds weight and expense, doesn't make it any quieter.
Thinsulate does block sound waves. So needs to be applied at 100% to work.
You'll get themost bang for buck from doing doors. Then floors. Then trunk. Its tire noise, yours and the other cars around, that make the most noise (assuming you don't have a hella loud exhaust).
You can actually hear engine and other pleasant sounds better, since there isn't so much less pleasant sounds. Signal to noise ratio. Also hear stereo better and easier to have a conversation with passenger.
Do 25% coverage using dynamat type material. I used 40 mil Noico from Amazon. Divide large, flat areas into square areas, then cut a piece 25% of that area, and place product in center of square.
Then apply 3M Thinsulate at full coverage to back of door panel.
Dynamat type material doesn't block sound waves. It adds mass to change resonant frequency. Gets rid of that oil drum effect. Adding more than 25% coverage just adds weight and expense, doesn't make it any quieter.
Thinsulate does block sound waves. So needs to be applied at 100% to work.
Joined: Jul 2014
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From: Chesterfield VA
@cosmomiller 's 9-year old killing road noise essay is hard to improve on. You've got the time and workshop space.
-- Chuck
-- Chuck
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Joined: Jul 2005
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From: Michigan
@cosmomiller 's 9-year old killing road noise essay is hard to improve on. You've got the time and workshop space.
-- Chuck
-- Chuck
