The globalization, rivalry and the technologies have changed the auto industry in a battlefield, where companies are fighting for quality, reliability, the reduction of development cycle and also cost.The manufacturing process of car body is the major responsible for time consumption, labor and investment. One of the bottleneck solutions is to use computational simulations during design phase in order to minimize the reworks. The car body is composed by several stamped parts, and its design requires a series of parallel activities, and one of the fundamental information is the accurate magnitude of spring back distortions, but due to the complexity of the phenomenon, the results are not so accurate as desired.The explored literatures are recommending numeric methods to simulate material's behavior and also the spring back phenomenon. In this paper, the goal is to compare several simulation parameters' performance emphasizing shell elements, meshing and material properties with the real results. The methodology to be used will be a comparison between simulation results, obtained by FEM and real ones. This study will lead us to identify which simulation parameters are more accurate and appropriate for predicting stamped panels spring back.