An extreme endurance test of the Revolution engine was performed in a dynometer installation at the Harley-Davidson factory in Milwaukee, simulating the German Autobahn (highways without general speed limit) between the Porsche research and development center in Weissach, near Stuttgart to Düsseldorf. Uncounted samples of engines failed, until an engine successfully passed the 500-hour nonstop run. This was the benchmark for the engineers to approve the start of production for the Revolution engine, which was documented in the Discovery channel special Harley-Davidson: Birth of the V-Rod, October 14, 2001.