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Computational fluid dynamics (CFD), is used in the GM Racing NASCAR program to support race team operations and aerodynamic research projects. To function as a practical tool, the setup process for industrial CFD tools must use real engineering models of race vehicles and must realistically simulate on-track aerodynamic conditions. Then, these tools must provide realistic simulation for high-Reynolds number flow over the complex geometry of a real race car. The biggest challenge to CFD tools is accurate prediction in regions of separated turbulent flow, such as flow in the wake and underbody regions. These regions have a significant effect on race vehicle performance. Because of the critical nature of separated turbulent regions both for better understanding of vehicle aerodynamics and for evaluating accuracy of the CFD results, these regions warrant detailed study.