Impact of an external, so called box, module on power and torque of the fiat 1.3 JTD motor

With the emergence of vehicles equipped with fuel injection systems with EDC electronic control system (Electronic Diesel Control) on the market, there appeared opportunity to make changes within the factory program of engine control management. This enables precise and differentiated shaping of the course of combustion. With the gradual development of the EDC different methods of intervention in the engine control program appeared, including exchange of the program in the EEPROM, connecting the external modules, so called Boxes, and programming via the EOBD diagnostic connector (European On Board Diagnosis). The article presents the external module, so-called Box and its impact on the variation in pressure in the Common Rail high pressure cell, and also on the power change and torque of the Fiat 1.3 JTD MultiJet engine. It is both the simplest and least effective method of increasing vehicle performance. Its simplicity lies in the fact that such a modification may be made by anyone who follows the installation instructions. There is no need to carry out program reading like in the event of program exchange in the EEPROM or programming by the EOBD diagnostic connector. The external module (box) is connected between the EDC and the fuel pressure sensor in the Common Rail cell. Thus, the control program does not change, but it is "cheated" by the module forcing from the EDC other values of signals controlling the actuators.