What is the variable valve exhaust pipe of a car? How to modify it?

The word "variable valve" is easy to understand from the overall appearance, and it looks like a simple throttle body. The principle of the system is to weld the variable valve device on the exhaust pipe, and the working principle of the system is to weld the variable valve mechanism on the exhaust pipe (install the valve at the appropriate position of the exhaust pipe system, usually at the middle and tail of the exhaust pipe).

The main purpose of refitting the exhaust pipe is to reduce the back pressure and make the exhaust more smooth, which is to extend the valve overlap time and improve the vital capacity in disguise. Therefore, it can change the characteristics of the engine and improve the response and power at high speed.

When the engine speed is low, close the valve to discharge the exhaust gas from the small diameter position or single pipeline to maintain the back pressure in the exhaust pipe and prevent the torque loss at low speed; The valve will open at high speed. The discharged waste gas will be directly discharged through a large-diameter position or a double pipe, so that the waste gas has more channels and outlets to be discharged, thereby reducing the back pressure in the exhaust pipe. This sustained horsepower will have a better performance.

In recent years, the variable valve exhaust system has mushroomed in the refit market. Have you ever wondered why the variable valve exhaust system is welcomed by most modification enthusiasts? From the principle of ordinary exhaust system, to build an exhaust system with both horsepower and torque, it is necessary to remove exhaust obstacles and maintain low torque output. So it is necessary to use a variable valve exhaust system.

Principle of variable valve exhaust system. Both manual and automatic control modes need the assistance of electronic system to successfully control the exhaust valve. We don't need to be as complicated as we think. In fact, the manual control mode is only "passive". Switching between opening and closing requires the owner's remote control button to open the valve. Such a system can also be divided into different opening modes such as full-time opening, full-time closing or automatic opening (different brand developers have different settings), which can be adjusted according to the needs of the owners.

Finally, it should be noted that when replacing the new exhaust pipe, the vibration may be too large, causing the exhaust pipe to shake left and right. At this time, it is best to replace the hard lug rubber sleeve (also needed when it is overweight) to prevent the joint from cracking. If you can master these principles, you will definitely like to reinstall the exhaust pipe.