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Technical Analysis: modified exhaust pipe is not the sound will become? - Exhaust pipe, modified - Automotive repair and maintenance industry

Modified exhaust system can be modified in the entry-car is almost hundred percent of the vehicle to modify their Car , The first thought of going to change almost all the exhaust system. However, in the knowledge there were a few more owners will go ignored, most likely at this stage of the modified exhaust systems are designed to shape, "throat, throat" of the exhaust noise running in the street they are really very hot ! Specifically talk about this as the modified exhaust, modified car owners all want to have a more rational understanding. Related Reading: Germany, the latest modified Ferrari EDO Enzo [Photos] Increase the Sport Kit Lorinser Mercedes-Benz SL sports car modification (Photos)

Exhaust system basically consists of five parts:

1. With the engine cylinder head exhaust manifold connected to the part of the name, commonly known as dead air banana, the role of the exhaust gas flowing through the cylinder head exhaust port collected so that it can smoothly discharge;

2. Turbo The engine, turbo exhaust side exit after the piece is called FRONTPIPE, Chinese "first installment"; NA engine from the bridge in addition to three-way catalytic exhaust gas flows, there is one that can make the engine and exhaust to achieve soft link;

3. After the environmental role is played a "catalytic device," required no more talk all know, is not the day for their own station car was cut emissions under the test plus a fine;

4. And then after that the drum (FRONTSILENCER), if used in the car, then it should be said is not in the role of drum major, or even cancel, but if a street car, modified, is to simply say reduce exhaust resonance phenomenon when;

5. Keep off the end of the exhaust is called drum (REARSILENCER), commonly known as dead air hose, also considered to be the most modified part.

Exhaust system modifications, plainly, is to reduce exhaust back pressure, back pressure of the definition, the academic point is: because the pressure inside the exhaust pipe to obstruct the exhaust pulse power. Reduce the back pressure actually make smoke, exhaust turn more smoothly, to lengthen the valve overlap time. Modified exhaust system, should start, the tail section to start, this concept of conversion companies in the country know, but what to do, many shops will be granted, or just-do, loud on the line. In fact converted (the drums) to end (drums), the key-shaped design to look after, but the design can be divided into "short and thick-type", that is, to minimize the tube length and diameter increased, this change law and not suitable for routine Travel As back down, low rpm exhaust flow slowly, resulting in none of the cylinder combustion of mixed gas was discharged, in the low rpm torque performance of the natural difference, but high transfer, pulse-intensive, high-turn under the exhaust smooth, large increase in horsepower; the other on the line

"Slim", converted on just replacing the tube material, and did not change the original curved shape, or even slightly thinner tail section, the benefits of this reform law is suitable for everyday city driving, high pressure pipe, exhaust can quickly drain away, the transfer torque low growth, but high turn the horsepower would not be as under. The tail drum, forms no more than two, a system called reflective, most of the original tail drum is, but, the problem is the resistance of large Power Serious loss; the second is called linear, the principle is very simple, basically import export department with the same straight line, silencing methods rely solely on the end of sound-absorbing cotton and cut, and almost all have adopted a modified tail drum linear.

It to end before the change, best according to their daily needs with Driving habits Would only be wise. End to End in

change should be on the ternary catalyst, and its role is to slow down the exhaust flow rate, and the formation of resistance. However, changes in the domestic problems faced by many catalysts, such as using fake catalytic performance and the prices cheap, but if caught on whom to test vehicle emissions, then emissions will certainly fail! However, if put on the real conversion catalysts, the price is very expensive, although the performance will be compared with original factory in a substantial increase, but really not everyone can afford or are willing to consumption, the million yuan to 20,000 yuan is not unusual for prices .

Dead air banana be the most important part of the exhaust system modifications, is the most dramatic. Original material of dead air banana usually cast iron, some of the depot will use stainless steel, like BMW, original banana exhaust because mass production, so not only very rough walls, even the exhaust manifold's length is not consistent and so it was a so-called phenomenon of exhaust interference. So, why Market There are few BMW cars modified banana dead air Sell I think a big reason is because the BMW's original product is already a stainless steel, and has a very high quality and high performance owes something to both.

Modified banana with dead air, usually with stainless steel material, simply use a few of its advantages: high temperature performance; walls thin, the overall weight; stainless steel tube wall does not have to polish slip This procedure, but their products than the original smooth a lot of pig iron, the movement is conducive to exhaust; the other is easy to bend and cutting, to achieve the objective of equal length is easy, especially in the NA change TURBO occasions, inevitably Use stainless steel dead air is to easily accommodate banana position. Manifold length of equal length, actually increase the horsepower have a positive impact, in theory, the work of each cylinder is the same order and time, if the exhaust pipe of varying length, the efficiency of each cylinder's exhaust must be biased, reducing the efficiency, but also between the various articles Manifold pressure difference exists, the end result is to exhaust pulse inevitable confusion, horsepower and torque outputs to the natural low; in TURBO engine, some say academic, as much as possible so that turbine exhaust side blades are quantitative, smooth, continuous attacks, so that the speed limit turbine work, efficiency, stability, a substantial increase, which can increase the boost pressure.

First batch, FRONTPIPE, is connected to a three-way catalytic dead air banana fruit that part of the exhaust pipe (exhaust gas turbine engine is the outlet to the catalytic side). NA cars will be fewer people to change part of the reason is not apparent. However, if the TURBO engine exhaust modifications, basically will replace his head approval, and why? This is because the relationship to the other proper nouns: second row of pressure. Very simple gas turbine vane by promoting the smooth flow of the exhaust section of a direct influence on the work TURBINE speed limit, the principle on the death of the car a little gas as NA banana role.
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