Hybrid powertrains for vehicles have been widely developed and spread in the market with the double goal of reducing fuel consumption and improve performance. The availability of a hybrid layout enables the possibility to recover energy while driving thanks to the use of the electric motors as generators, thus increasing the energy available and enhancing both the hybrid performance and the pure electric driving range of the vehicle. The integration of traditional internal combustion engine and electrical traction can be engineered according to different layouts and control logics, all affecting the vehicle dynamics. This paper shows the analysis of a parallel hybrid supercar, investigating how the different subsystems of the powertrain cooperate. In details, reverse engineering has been applied in this study to identify the behavior of the systems in energy recover during braking manoeuvres, through the analysis of the signals collected during track testing sessions. This paper shows the layout of sensor positioning and the standard manoeuvres performed, with an eye on the electrical acquisition and elaboration. The development of a simplified simulation model of the vehicle through the analysis of the dynamic response of the vehicle to the imposed input is described. The comparison of the experimental track-test collected signals versus the simulation results is proposed, showing how the reverse engineering simulation model represents a powerful tool for the Performance Engineers.