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The use of dynamometers, especially inertial ones, has been widespread in Brazil in recent years. This increase in the use of the tool has several reasons, among them the greater availability of equipment, price reduction and the appearance of programmable electronic injections. Programmable injections, for better engine performance, must be adjusted in the different conditions of use and in the different points of the injection and ignition maps. This adjustment could be made by driving the vehicle on streets or in a proving ground, however the torque and power gain cannot be measured with sufficient precision to decide the ideal ignition timing and injection time. The inertial dynamometers marketed in the country, and used in repairers or vehicle preparers always bring software that allows the acquisition and registration of the information obtained in the tests.