Completed my sound deadening project for my car. I’ve been having rear rattling issues so I decided to tear the rear down and sound deaden along the way. Going in I knew the rear trunk and wheel wells were the loudest areas resonating sound.
Stripped rear trunk liners and seats. Notice how little oem sound deadener there is. Most of the sound deadening in the rear is from the bottom seat and liners. Tesla uses acoustic foam under the seat and liner.
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Subwoofer out
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Added Second Skins damplifier to dampen vibrations and resonating panels. When you knock on the trunk floor it sounds like a drum!
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Added Second Skins Luxury Liner Pro and mass loaded vinyl for sound blocking on the wheel wells.
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Complete. Mass loaded vinyl and decoupler in the trunk wall. Luxury Liner Pro on motor and floor of trunk.
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I took a drive at various stages during the process since this took a few days to complete.
With the rear completely stripped to the metal, the car was LOUD. There was no dampening from the oem seats and liners. The sheet metal was the only barrier to the outside. You can hear the tire noise resonate all over the cabin. The motor was also crazy loud.
With the sound deadening damplifier sheets applied, the car was still very loud. Not much has changed in term of road noise. “Dynamatting” doesn’t do anything for road noise but helps with vibrations.
Went for a spin after applying mass loaded vinyl to the wheel wells and trunk. This made a difference. Road noise was noticeably reduced even with the car still stripped. I can compare it to how the car normally is with the seats folded down.
Went for a drive again with the liners and rear seat in. The car is considerably quieter. The tires used to resonate sound all over the cabin and sound droney on the freeway. Now that drone has been considerably muffled. The difference is very noticeable. I’m convinced most of the road noise is from the back and resonates up the shock towers and wheel wells into the cabin. I don’t plan to do the doors or anywhere else since the car is pretty quiet now. I also heard doing the doors, floors, and front wheel wells made little effect. The best bang for buck has to be the trunk and rear wells. I highly recommend properly deadening the rear if you want to quiet road noise down. Rattling is still there when I go over bumps and I’m pretty sure it’s the rear deck. Just going to bring it in and see what they say about the deck.