There are two ways to refit a car: wearing new clothes and wearing sheepskin. Many beautiful signs are pasted on the body of the car to make the car as eye-catching as if it was wearing a new fashion, which is "the emperor's new dress"; A modification method of "wolf in sheep's clothing" is also popular, which improves the engine and driving system of your car with high performance without changing the appearance. Once you encounter a car of the same model, you can immediately show distinctive performance.
Precautions for vehicle refitting - large flow air filter
Many people believe that the air intake provided by the large flow air filter is different when the engine is running at high speed, but this statement is not very accurate. Because the air intake volume will not change due to the modification of the air intake device, as long as the engine exhaust volume does not change, the air intake volume will not change unless a supercharger is used. The principle is that the engine uses vacuum auxiliary pressure to let outside air enter the cylinder, but because the air enters the cylinder after passing through the filter, the resistance makes it impossible for the air to enter at the same pressure as the outside world, and because the air has inertia, it is a key step to modify the air filter. Through the test after the actual modification, the power of the engine is increased when the engine is running at high speed, the engine runs smoothly, and the acceleration is good.
Expert opinion: the installation of large flow air filter should be as far away from the engine as possible. The lower the temperature of the air flow entering the engine, the better. Only low temperature can have high density; At the same time, the oxygen content will be slightly increased. If there is no suitable space around the engine for installation, the engine and filter can be separated by a partition.
The price of air filter for common refitting varies according to different models, ranging from 350 yuan to 800 yuan. It needs to be cleaned or replaced between 10000 km and 30000 km. Maintenance and replacement are cheap.
Precautions for vehicle modification - modification of exhaust system
After the air intake system is modified, the exhaust system will also be further modified. It is popular to change the tail section of exhaust pipe to direct exhaust. From the rear, you can see a thick exhaust port, and feel that the vehicle seems to have a lot of power. If the front and middle sections of the exhaust system are changed, professionals are required to do it. Because too smooth exhaust may affect the torque at low engine speed; When changing the front and middle sections of the exhaust pipe, pay attention to the technical content and actual testing.
There is also a dual tone straight row bucket, which can be installed with a small muffler in daily use, almost the same as the one without modification. When playing with the car, remove the muffler to release the sound.
Expert opinion: this change has little effect on engine power improvement, but only pursues an auditory effect. Straight row barrels of different brands have different sounds. It is better to choose the straight bucket with large and pleasant sound release when accelerating and small sound when driving at a steady speed. Otherwise, the driver will feel tired and irritable when driving for a long time. Due to different origin and vehicles, the price varies greatly, and the basic price is between 900 yuan and 2000 yuan.
Precautions for automobile refitting -- change of engine ignition system
Another popular retrofit option is to replace the ignition high-voltage wire and spark plug of the engine with a special model for retrofitting. In order not to interfere with other vehicle electrical equipment, ordinary ignition high-voltage lines will artificially increase the line resistance during manufacturing. The car audio and computer will not affect their work due to high-voltage interference, making daily driving safe. But this design also consumes part of the high-voltage ignition energy.
In order to improve the ignition energy of the engine, the parts manufacturer provides a high-energy high-voltage ignition wire for retrofitting. The internal resistance of the high-voltage ignition wire is much lower than that of the ordinary high-voltage ignition wire, and the passing ability of the ignition electricity is good; In order to overcome the impact on other equipment, the wire body shell is shielded with high-tech materials, which has a beautiful appearance and improved durability; The multi-core system is adopted to ensure the smooth line.
The high-voltage ignition wire for retrofitting uses professional spark plugs. Japanese NGK and Taiwan products are popular in the market. These spark plug ignition positive electrodes are needle shaped, which can improve ignition energy. The use of platinum, iridium and other precious metal materials enables the spark plug to withstand a high temperature above 2000 ℃. Laser welding technology also makes the spark plug discharge point more accurate.
Expert opinion: There are many models and brands of high-voltage ignition wires for refitting in the market. The high-end NGK products are recommended. They have beautiful appearance, excellent quality and workmanship. The basic price is around 1500 yuan, and the price is very high; The universal spark plug can choose a 9-core low resistance high-voltage ignition wire made in Taiwan, 800 yuan to 1200 yuan per set. The price is relatively cheap and the effect is good. The other thing is that there is no fame. The modified ignition wire with ordinary use effect costs between 400 yuan and 500 yuan. Pay special attention to the product performance parameters on the package when purchasing.
Precautions for automobile refitting -- improvement of fuel pressure control valve
The popularity of multi-point EFI engines has brought convenience and substantial benefits to retrofitting.
The fuel supercharger is a good configuration for power improvement of electronic injection engines. On the engine oil supply system, there is a fixed and non adjustable device - fuel pressure regulator. The main engine factory sets it at 2.0~2.5KG/CM, and the output pressure of the gasoline pump in the gasoline tank is generally more than 5KG/CM. Therefore, it is possible to increase the fuel pressure to 3.0~3.7KG/CM by installing an adjustable regulator after the non adjustable fuel pressure regulator. After installation, the amount of fuel passing through the nozzle per unit time is increased; When the pressure increases, the gasoline sprayed by the fuel injection nozzle has better atomization effect and more sufficient combustion. Almost all engines equipped with fuel superchargers can feel the improvement of vehicle power.
Expert opinion: According to foreign test results, the fuel supercharger can help increase the engine power by about 10 horsepower. However, the air intake device must be modified at the same time, otherwise it may cause insufficient air intake and insufficient combustion.
