Abstract: A system for computer dynamometer testing while running an auto racing simulation. The combination increases the entertainment value of testing through a real-time interactive racing simulation. The system includes a vehicle testing station such as a conventional chassis dynamometer with digital feedback and load control for automatically increasing or decreasing the load applied to the vehicle wheels under test, a programmable test controller connected to the digital feedback unit for collecting data, and also connected to the load control assembly for controlling the dynamic load applied to the wheels of the vehicle. In addition, a simulation computer is connected to the programmable test controller and includes diagnostic software for analyzing said data, simulation software for running a synchronized race simulation based on the data, and report generation software for generating the diagnostic report based on the analyzed data.