I believe that everyone has fantasized about owning a supercar or high-performance car of their own, that kind of wind-pulling appearance and high-pitched exhaust sound is really addictive, coupled with the "bang bang" cannon sound in the exhaust pipe, which attracts everyone to stop. However, sports cars and high-performance cars may not be available even if we struggle for a lifetime, but if you want your car to have a "bang bang" cannon sound, this idea is still relatively easy to achieve.
In the inherent impression of many people, the exhaust cannon is achieved by adjusting the "off-time ignition", which is actually not wrong. As early as the 1980s and 1990s, when turbo engines were just beginning to emerge, it was found that this engine had more horsepower than self-priming engines and could lead to a more violent driving experience. However, because the automatic transmission was not widely popularized at that time, the manual transmission shifted slowly, so it caused a serious problem after matching the turbine engine - turbo lag.
The so-called turbo hysteresis refers to the fact that when the engine is at a low speed, the amount of exhaust gas generated is too low to drive the operation of the turbine. Therefore, it is necessary to wait until the engine speed is increased and the exhaust gas power is large before the turbine can start. This time difference is turbo lag. In order to reduce the problem of turbine hysteresis, the later invention of the off-time ignition system, and the so-called "off-time ignition" is to greatly delay the ignition timing in the process of engine piston work, deliberately let a part of the oil and gas mixture enter the exhaust pipe through the exhaust valve, so that the design is also to prevent the concentration of the oil and gas mixture in the cylinder is too high, and the reaction force generated by the explosion when igniting causes damage to the piston linkage and crankshaft impact.
At this time, the mixture of the engine combustion chamber is ignited, and the energy generated will enter the exhaust system, thereby igniting the oil and gas mixture in the exhaust pipe, and the energy released by the oil and gas mixture that is ignited at this time will push the turbine exhaust blades, so that the turbocharger can maintain high speed operation, thereby making up for the problem of turbo hysteresis. However, because the oil-gas mixture ignited in the exhaust pipe is pushed by the energy of the engine combustion chamber, the sound emitted by the rapid flow through the exhaust pipe is quite explosive, and it will make an explosive "bang bang" sound, and even the exhaust will appear to spew fire.
Many modified players will further delay the ignition time of the engine in order to make the "bang bang" sound of the exhaust pipe be louder, so the off-time ignition can make the exhaust have the effect of firing the cannon. However, this way in the case of matching the automatic transmission will cause another problem, the engine smoothness is very poor, resulting in a strong sense of frustration in the vehicle, while there is a certain damage to the engine parts, so the automatic transmission with faster shift speed is not suitable for the use of "off-time ignition", so how does it achieve the exhaust gun effect?
Nowadays, most family cars use electronic throttles, and the biggest advantage of electronic throttles is that the ECU (engine control unit) and TCU (transmission control unit) also have the right to control the throttle, so that in the engine shift gap, closing the engine throttle and stopping the injection can also achieve reducing the engine speed to complete the shift. Although this shift speed is significantly faster than that of manual gear, the actual effect is not very ideal, which is not conducive to the continuous output of performance under high rotation.
Therefore, in order to ensure that the power is not interrupted, the gearbox completes the gear shift at the fastest speed, the engineer adjusts the coordination ability of the ECU and the TCU, and directly suspends the engine oil supply and ignition function during the shifting process, so that the air passes directly in the combustion chamber, so that the exhaust gas can also push the turbine to rotate and reduce the turbine hysteresis. When the gear shift is completed, the injector and spark plug functions are turned on instantly, and the engine directly returns to peak power, so that there will not be much loss of performance.
So what does this have to do with the exhaust cannon? In fact, the exhaust cannon is also engineers can be called out, such as some sports cars and performance cars, in the transmission shift process, only turn off the engine ignition function, and do not cancel the injection link, and at this time the fuel and combustion chamber air formed by the gas mixture will enter the exhaust pipe, and then the exhaust pipe high temperature will ignite the mixed gas, you can achieve the effect of the cannon. However, compared to the sound of cannon firing at a time-off, this sound sounds more muffled and textured. The sound effect of the off-time ignition is very direct, and the continuous explosion sound is simply unacceptable to ordinary people. Therefore, today's exhaust cannon has little to do with the off-time ignition developed to solve the turbine hysteresis.
Can civilian vehicles have the effect of exhausting cannons, the answer is of course feasible. Just need to choose a reliable program provider, find a god to help your car to do special adjustments, write the program into the ECU, you can have the effect of exhaust cannon. The exhaust cannon is generally also divided into shifting the cannon and the oil cannon, of which the shift gun only needs to increase the fuel pump injection volume, or replace the injector nozzle with a larger flow, and the unlit mixture enters the exhaust system and the high temperature detonation will make a "bang bang" sound.
And if you want to have a continuous "crackling" cannon sound, you need to set the throttle in the ECU to maintain the state of fuel injection, which is no matter in any state, as long as you close the throttle, the exhaust will eventually emit a crackling effect. However, the above sound effects must be achieved on the basis of the modified exhaust, especially for small displacement models, the original exhaust is difficult to achieve.
summary
The era of the internal combustion engine has gradually faded, and if you still want to listen to the exhaust sound of the engine in the future, I am afraid that you can only hear it on your mobile phone. As a symbolic product of the era of the internal combustion engine, the exhaust sound wave has brought endless joy to the generation living in the present. Therefore, if you also want your car to have the effect of exhaust and firing cannons, you may wish to simply learn some modification knowledge, choose a suitable exhaust and program provider for yourself, and then find a reliable modification shop to have. In addition, in the minds of many people, the modified exhaust must be very explosive, in fact, for some big-name genuine exhaust, the sound wave of tuning will be controlled in a reasonable range, and the exhaust can also be controlled by closing the exhaust valve or controlling the ECU with a mobile phone, which can return to quiet mode, so that in the urban driving can not only do not disturb the people, but also reduce fuel consumption.