subject: Technical Analysis: modified exhaust pipe is not the sound will become? - Modified car, modified - automotive supplies industry [print this page] Technical Analysis: modified exhaust pipe is not the sound will become? - Modified car, modified - automotive supplies industry
Modified exhaust system can be Modified car Entry, almost hundred percent of the vehicle to modify their vehicle, first think of going to change almost all 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 ! as the talk about this specifically modified exhaust, modified car owners all want to have a more rational understanding.
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. Turbocharged engine, the 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 flow, there is a is that we can make the engine and Exhaust Achieve soft link;
3. After that is from Environmental protection Effect " Three catalytic converters "Required no more talk all know, is not the day for their own station car was fine plus cut emissions under the test;
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 the name off the end of the exhaust 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 to care-shaped design, and 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 everyday driving, because back down, low rpm exhaust flow rate slow, led to none of the cylinder combustion of mixed gas was discharged, in the low rpm torque performance of natural difference, but high transfer, pulse-intensive, high transferred under the exhaust flow, horsepower increase is relatively large; 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. As Last drum The form of no more than two, a system called reflective, most of the original end of this form of drum is, but the problem is the resistance of large, severe loss of power; the second is called linear, the principle is very simple entrance with Department of Export is basically the same line, silencing methods rely solely on sound-absorbing cotton and the cut end of the drum end of almost all the modifications are adopted straight line.
It to end before the change, best according to their driving habits with their daily needs 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! But if put on the real catalytic conversion device, 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 the price.
Dead air banana be the most important part of the exhaust system modification 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 it is mass production, so more than the inner wall is very rough, and even the length of the exhaust manifold may not be consistent Thus arose the so-called phenomenon of exhaust interference. So, why the market there has been little modified BMW car banana dead air Sell I think a big reason is because the BMW of the original product is already a stainless steel, and has a very high quality and high performance owes something to both.
Converted banana with dead air, typically of stainless steel as the 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 easily bent and cut, 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, in fact, for the horsepower increase has a positive impact, in theory, the work of the 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 manifold pressure difference exists, the end result is to exhaust pulse inevitable confusion, horsepower and torque output, it naturally low; in TURBO engine, some say academic, as much as possible to make turbine exhaust side blades are quantitative, smooth, continuous attacks, so that the speed limit turbine work, efficiency, stability, a substantial increase, which can increase boost pressure.
First batch, FRONTPIPE, dead air is connected to the three-way catalytic banana fruit of 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: the 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 and the limit theory on the death of the car a little gas as NA banana role.
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