How to Soundproof a Car?

[DelLane]

Seal all holes and openings on the steel plate between the engine compartment and the cabin, whether they are wired or not, using foam sealant. Clean the inner arch plastic or flocked panel thoroughly, ensure it is firmly secured, and then directly spray the wheel arch soundproofing damping paint onto the inner arch.

[DavidDella]

I recently completed sound insulation modifications on my car, mainly focusing on the four doors and chassis. First, I applied butyl rubber damping sheets to the inner side of the doors to effectively reduce vibration noise, then installed soundproofing cotton to absorb high-frequency sounds. For the chassis, I first covered it with felt material, then laid a layer of soundproofing rubber mat, and added specialized soundproofing coating to the wheel arches. The whole project took two weekend days with material costs over 800 yuan. Now the tire noise and wind noise are significantly reduced while driving, and even the audio system sounds better. When doing it yourself, be careful not to block the door drainage holes, and choose eco-friendly materials to avoid unpleasant odors in the car.