What are the reasons for the loud noise in BMW X3?

[VanJace]

BMW X3 loud noise reasons include poor door sound insulation, poor original body sound insulation materials, poor cabin floor sound insulation, and other aspects. Poor door sound insulation: Door sound insulation treatment, this step mainly aims to reduce the wind noise problem of BMW X3. Remove the door panel accessories, there is a layer of damping board on it, which is thicker than other models; however, the sound insulation materials used in the original car are relatively ordinary, and the sound insulation effect still needs improvement. Poor original body sound insulation materials: Paste car sound insulation materials with better damping effects, otherwise the noise will be very loud. It effectively improves the solidity of the metal sheet, avoids the drum skin resonance phenomenon of the metal sheet, and effectively reduces wind noise intrusion. After double-layer sound insulation treatment on the front and rear doors, the wind noise will be significantly reduced. Poor cabin floor sound insulation: Cabin floor sound insulation is mainly to reduce road noise and chassis resonance noise. Remove the seats, carpets, and other accessories, this is the original chassis structure of BMW X3. Solutions for loud car noise: Paste sound-absorbing foam materials under the engine hood; install sound-absorbing cotton materials on the trunk, the bottom of the trunk, and the wheel arches on both sides of the trunk; install professional damping boards in places prone to noise; install sealing strips inside the doors; replace tires.