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In the process of power train development testing is essential. One option is to install on-board measuring equipment in a test vehicle and to execute test rides on a real road or proving ground. However, with regard to preparatory efforts as well as repeatability of test conditions, testing should be done on a test rig. This could be either a roller type dynamometer test bed, although dynamic testing is restricted due to the high moment of inertia of the rollers. Taking this and reduced cost into account a test setup with dynamometer directly attached to the wheel hubs of the test vehicle should be considered. This kind of test setup has already been used for some time. A major challenge in this setup is the appropriate control of the dynos in such a way that the desired test aims can be achieved.