A conventional car engine uses at best about one-third of the fuel combustion energy, while the rest of the energy is lost in friction and most in heat. In the face of the new emission regulations proposed by the government due to the high levels of pollution, and with the aim of achieving cleaner and more efficient transportation, vehicle exhaust gas recovery is being researched in the last years. It is of interest for the automotive industry to recover this wasted energy, thus increasing engine efficiency, reducing fuel consumption and pollution. One way to achieve both objectives is the conversion of engine waste heat to a more useful form of energy, either mechanical or electrical. This paper study a system prototype based on Brayton´s thermodynamic cycle driving an Electrical Generator to recover energy from the exhaust gases from a commercial internal combustion engine.