In 1983, 956 chassis #107 was used by Porsche as a testbed for their P01 Formula One engine, later badged as TAG and used exclusively by McLaren. The car was able to test some of the characteristics of a Formula One car in order to develop the engine. The engine became highly successful in F1, and while never the most powerful on the grid, between 1984 and 1987, the turbocharged TAG-Porsche would win 25 Grands Prix and help McLaren to two Constructors and three World Driver's Championships. As of the 2012 German Grand Prix, the TAG-Porsche engine sits in 7th place on the list of F1 race winning engines.