1. The engine noise. In addition to the mechanical sound emitted from the engine block, but also including the intake system noise, isuzu turbocharger namely the high-speed gas through the air filter, intake manifold, valve into the cylinder, the flow process, will produce a strong aerodynamic noise. Mainly by engine noise baffle wall and the floor of the cab before the site passed the cockpit.
 
2. The tire noise. General tire noise is mainly composed of three parts: First, the tire tread and tire clearance around the air flow noise consisting of air turbulence air; uneven pavement road noise is caused by three; the second is part of the carcass and tread vibration noise caused by vibration .
 
3. Air noise. First, the wind noise, resulting in a pressure change is the separation of the noise generated by the air flow around the body; the second is wind leak, or call the sound absorbing noise is aspirated from the cab and the body gap with the airflow around the body resulting from the interaction; three other noise, including cavity resonance and so on.
 
The body structure noise. Mainly affected by two factors, namely the transfer mode vibration body structure, the second is due to the car body metal components vibrate under the action inside and outside noise.
 
We can deal with the noise in two ways:
 
The first is fundamental to make noise disappears or small, to eliminate noise fundamentally First, let's understand the noise under the car in the end comes from where? Targeted to identify the different sources of noise on board, in order to remedy, cure, "noise" in order to cure the patient. For example, the noise of the tire can choose a low tire noise to reduce tire noise. This is the fundamental problem.
 
The second is to do the whole car noise project, which is the method used by most of the people we look at the highlights, though it sounds outside noise is not changed, but there is a seat in the cab was quiet a lot. General configuration for lower vehicle noise, comfort or more general low-end car. If it is high-end cars, the original noise is already quite good, go spend money to make noise but superfluous. There is also the effect of car riders to upgrade soundproof questioned after that car upgrade after noise masked the effect of noise is minimal or even no effect, but also increases the vehicle's weight, fuel consumption, Renault scenic 1.5 dci turbocharger which is mainly riders selected brands and soundproofing products improper quality. Car noise should ringworm how how to do it?