Car modification is a systematic project, therefore, have to learn a systematic study of car modification. Here, racing parts the Chinese network will in turn converted to introduce some common knowledge conversion system. As already told you all about the ignition system modification modified intake system knowledge conversion and modification of knowledge, Today, I will introduce a modified fuel system of knowledge 1, fuel system classification: Fuel supply system is divided into two carburetors and fuel injection systems, but on the power output, fuel efficiency, air pollution, and other aspects of reliability, the carburetor fuel injection system than can be said nothing, although it is still there are a lot of old cars on the road using a carburetor, but the carburetor era has become history. Therefore, China modified net today to talk about is the single engine fuel system means the fuel injection system. Fuel injection system is composed of conveyor systems, sensor systems, computer control system components. It works in simple terms is the use of the gasoline fuel pump pressure after the high pressure feed from the tank, through regulation of the pressure regulator, so that the oil pressure in the system was maintained at 2.0 ~ 2.5Mpa, that is, to gasoline nozzle pressure was maintained at 2.0 ~ 2.5Mpa. At the same time by the sensor and the intake air engine operating condition is transferred in the form of a current pulse signals to the trip computer (ECU: Electronic Control Unit), ECU be analyzed according to the pulse signals, calculate the required amount of fuel injection, that is, calculated fuel injection nozzle after time, then the signal is transmitted to the injection nozzle coil, fuel injection nozzle accept signals would fuel injection valve is opened, then sprayed gasoline into the intake inlet front side within the manifold, and then with the inlet opening of the door into the cylinder inside. Category 2, the injection system 1) Press the jet (nozzle) position classification: After the throttle body jet, also known as a single point, use only one or two branches nozzle mounted in the top of the throttle valve to a lower pressure spray gasoline, gasoline and air flowing through the throttle valve to form a mixed gas, must first tube and then by the inlet door into the cylinder through the intake manifold. However, when the oil and gas flowing through the intake manifold, some oil and gas will be attached to the wall of the manifold, impreza gc8 coilovers and will vary depending on the shape of the intake manifold, the length of each cylinder caused by the uneven distribution of the mixture. Because oil and gas from the throttle valve to the cylinder an inherent time delay, so the reaction will slow the engine during acceleration. Multi-point injection, each with an injector for each cylinder before the inlet door, door alignment inlet to the high pressure of 2 to 5 gasoline ejected with the air intake manifold into the cylinder together to form a mixed gas . As a result of oil and gas into the mixing ratio of each cylinder to be average. 2) Press the injection mode Category: Continuous jet, also known as mechanical jet, nozzle when the engine is running at constant fuel injection, and injection quantity is controlled by varying the supply pressure to achieve. Due to mechanical injection is an outdated design, so far, almost all types of vehicles using the efficiency and economy better jet program. The single point of injection in addition to lower prices, simple structure, but also without any comparable multi-point injection and place, and it comes with a lot of the same disadvantages and carburetor (low efficiency of each cylinder uneven distribution of oil and gas), and therefore multi-point injection (MPI) can be said to be the mainstream of modern jet fuel supply system.