In movies such as "The Fast and the Furious" and "Gone in 60", as well as in games such as "Need for Speed" and "Ridge Racer", there is a feature that makes the screen in front of you blurry and makes it difficult for you to see what's ahead. Road stuff, that's the nitrogen acceleration system.
We all know that nitrogen itself is a very inactive gas. How does it achieve that kind of acceleration?
In fact, the so-called "nitrogen acceleration" does not use nitrogen at all, but N2O, which is nitrous oxide, commonly known as "laughing gas". To understand its principle, we must first understand the working principle of the gasoline engine in the car. A gasoline engine uses the combustion of gasoline to generate work to make the car run. In addition to the requirements for combustion materials and ignition points, combustion also requires combustion aids. The general combustion aid is oxygen. By injecting a mixture of gasoline and air into the cylinder (there are also separate injections and then mixing in the cylinder), the temperature in the cylinder is increased through the compression of the cylinder, and then the electric spark of the spark plug causes the mixed gas to explode and push the piston to continue running. This is how a general engine works. In order to increase the power of the engine, there are two main methods: increasing the amount of oil incoming and increasing the amount of assisting gas entering. Increasing the fuel intake is very simple, just increase the throttle, but increasing the intake of supporting gas is more troublesome and requires other devices to achieve it. Mechanical supercharging was first used to increase the amount of air entering. The method was to connect a belt through the crankshaft of the engine. The other end of the belt was a supercharger. In this way, as long as the engine was rotating, the blades of the supercharger could be driven to rotate. Blow more air in. The advantage of this method is that it can more effectively use the oxygen in the air to mix with gasoline than a naturally aspirated engine, so that the gasoline burns more fully and the natural power increases, but this will directly increase the burden on the engine, so Then came turbocharging. Unlike supercharging, turbocharging uses exhaust gases to push the blades of a supercharger to inject air. Like supercharging, it can increase the combustion of gasoline and improve performance, but turbocharging puts a relatively smaller burden on the engine, making turbocharging relatively more fuel-efficient. But the shortcomings of turbocharging are also obvious, which is severe lag. Usually in order to accelerate, we will coax the accelerator to be very high. However, at this time, it is impossible for the exhaust emissions to catch up immediately. It will take a while before the exhaust emissions will increase due to the increase in engine speed.
So there is a nitrogen acceleration system.
Unlike turbocharging and supercharging, the nitrogen acceleration system is a patented product, so it cannot be produced by any manufacturer. The American HOLLEY company invented the nitrogen acceleration system. Its full name is NITROUS OXIDE SYSTEM, commonly referred to as NOS. The nitrogen acceleration system requires a cylinder filled with high-pressure liquid N2O. When it is needed, the high-pressure N2O is pressed into the engine. The oxygen produced by the decomposition of N2O is used to support combustion, and the nitrogen is used to cool down, rather than like in the movie "Speed ????Legend" As mentioned in the article, the combustion explosion produces nitrogen that is 5 times more powerful than gasoline (in fact, nitrogen cannot burn under natural conditions at all). Compared with the above two supercharging devices, nitrogen has a better acceleration effect and can be used at any time, but it has many disadvantages, one of which is the relatively high cost. Not only is the modification cost high, but N2O is not inexhaustible and cannot be recycled. But the effect of N2O is indeed very good. Although it is impossible to produce a visual blurring effect like in movies or games, which is exaggerated, the effect is definitely much better than using a supercharger. Therefore, the increase in engine temperature will Soon, that's why nitrogen is needed to cool things down. But even so, nitrogen acceleration cannot be used for a long time. Although it is not as high as 10 seconds to cause the engine to explode as mentioned in "Speed ??Legend", it is still generally recommended that the use time should not exceed 1 minute. But having said that, how can it usually take 1 minute? Even counting from the start and including the gear shifting time, a general modified car probably only takes about 10 seconds to reach the top speed. After that, it is useless to use nitrogen to accelerate. The engine is at its limit. And even under normal circumstances, the lower the gear, the faster the engine speed rises, and the shorter the gear shift interval. Therefore, it is generally used after shifting to the highest gear. This not only achieves faster acceleration, but also It can be thought that increasing engine power makes the top speed higher than normal.
However, precisely because the acceleration effect of nitrogen is "too obvious", its use also places a very large load on the engine and is therefore very dangerous. Therefore, when modifying the nitrogen acceleration system, there must be a safety device to ensure that N2O will not be accidentally sprayed. . In addition, the civilian nitrogen acceleration system is relatively less effective - also for safety reasons. But in professional drag racing, for example, the effect of nitrogen acceleration will be very obvious. In addition, if it is not a drag race but a general track race, and you are not using it on straights but in corners, then the acceleration of just two or three seconds brought by nitrogen acceleration can be said to be completely useless, but only It will cause additional damage to the engine, so mastering the timing of using nitrogen acceleration is also a must for those who have modified nitrogen acceleration or want to modify nitrogen acceleration