Until the 1980s, Audi wasn’t an important name in motorsport, with its most successful race cars having been built in the 1930s when the brand was part of Auto Union. Things changed dramatically when the Quattro was introduced in 1980, spawning models that went on to dominate the rally scene and the Pikes Peak hill climb. After laying low in the 1990s, Ingolstadt decided to tackle prototype racing and created a series of vehicles that went on to dominate the competition, as well as the 24 Hours of Le Mans. Its most important racer, the R18, hit the motorsport scene in 2011 and went on to win the 24 Hours of Le Mans four times in a row before being defeated by the Porsche 919 Hybrid in 2015. For 2016, Audi has redesigned the R18 from the ground up.