For the performance control and modification control, the exhaust pipe is definitely a place to be changed. The ordinary exhaust gas is designed as a negative pressure type exhaust for the purpose of taking care of the low twist, and if it is for the sound wave effect and the high speed performance, everyone will put The exhaust gas was changed to a straight row, but there was another problem. When I opened it, it was quite high. What should I do if I bring my family or go home late at night? The people around us have such an encounter, starting the car in the winter morning, next to it. The car's alarm is full... The above paragraph may be seen in the fog of many people, it does not matter, let us slowly interpret, first understand the general form of exhaust. An exhaust system is a system that collects and discharges engine exhaust, including an exhaust manifold, a three-way catalyst, a muffler, and a tailpipe. Exhaust gas is divided into negative pressure type and straight type. When the automobile manufacturer produces the automobile, the exhaust gas is set to the negative pressure type. When the engine is working, the exhaust gas from each cylinder will be discharged from the cylinder in a certain order, and collected into an exhaust line through the exhaust manifold, which will generate a wave of gas in it. Waves, lined up and walked out of the pipeline. At this time, the first exhaust gas will generate some vacuum pressure, that is, the negative pressure. This pressure can help the exhaust gas discharged more smoothly, so that when the engine speed is low, the structure can be indirectly Improve engine exhaust efficiency to achieve low torque. The negative pressure type exhaust pipe of the original factory is small, and the muffler drum is also complicated, forcing the exhaust gas to be discharged smoothly and generating negative pressure. Although the noise is small, this structure can improve the low speed torque, but the high speed Exhaust clogging occurs during operation, which affects the output power. Although the original factory will be set to this, the performance characteristics of the more neutral can satisfy most of the groups, and the noise is not big, but after all, there will be some fans who love the car are not satisfied with the status quo, the violent sound is The effect they want, straight out of the exhaust can meet their requirements for the car. Straight out of the exhaust, which simplifies the exhaust manifold and other devices that hinder the exhaust output, as smoothly as possible to exhaust the exhaust gas from the engine to the atmosphere, most of the exhaust is a straight pipe from front to back, Of course, there is no exhaust gas revolving device like negative pressure exhaust, and the sound of the exhaust gas is much louder, or noise. Direct exhaust is generally simple The shortcomings of this kind of exhaust are also very obvious. The need for back pressure of the engine at low speed is not considered at all. The direct exhaust gas generally appears on the performance super running or high performance modified car. In the final analysis, it has good performance. The car can be used for direct exhaust, and the low speed is offset by the powerful power of the engine. The high speed does not affect the smooth exhaust of the engine. The straight-out exhaust structure is simpler, especially on the tail section silencer, and the exhaust gas can pass through the exhaust line more quickly, thereby achieving efficient exhaust. The advantage is naturally that the engine exhaust is smooth and the high-speed torque is strong. Then the problem comes. Is there any kind of exhaust that can satisfy the increase of torque at low speed without affecting the smoothness of high-speed exhaust? It can have high exhaust sound and when needed. Be a quiet kitten? The answer is - yes! The variable valve exhaust system is our ideal exhaust, but what kind of artifact is it? The technology of variable valve exhaust is not so high. An adjustable valve is installed in the pipeline to make it quiet and take care of the low torque according to the owner's intention (manual) or the engine speed (automatic). Back pressure exhaust, or the sound of the waves, pay attention to the direct discharge of high-performance performance. Variable exhaust valve The variable valve is driven by a vacuum pump, similar to the bypass valve on the turbocharger, and determines whether the exhaust is smooth or not by controlling the opening and closing of the valve. It can be done by thinking of control and computer control. Variable exhaust valve structure principle Manual variable exhaust valve Variable valves generally appear in the tail section of the performance car Computer automatic control. The variable valve exhaust system has an information receiving processor, that is, an exhaust ECU or a processor, which is used to automatically control the opening and closing of the exhaust valve according to a preset program. The exhaust ECU is usually adjusted according to the engine speed and throttle depth. The driver can also set a speed node. When the engine reaches the preset speed, the exhaust ECU will automatically open the valve according to the program setting. Automatic variable exhaust valve Comments: With this set of exhaust, low twist, high turn is not weak, when the street is full of noise, when you go home, it is silent, I really don't know why there is no reason to choose it, oh The price is the only shortcoming. The same product is about twice as expensive as the exhaust without valve. The good brand is more and more. I hope you can buy it according to your own needs.
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