In 1989 Audi developed the first TDI production engine. In 2006, 17-years after it’s invention, Audi would achieve it’s first victory of a diesel-powered sports car at Le Mans. The first aluminum cylinder block 5.5-liter V12 TDI in the R10 TDI developed more than 650HP with over 811 ft-lbs. of torque. The current 3.7-liter V6 TDI unit with a single turbocharger has 32-percent less capacity and 24-percent less power than the 5.5-lire V12. Even with the reduction in size Audi engineers have figured out how to increase lap times by 2.8-percent by better utilizing the engines potential and reducing wasted energy. The engine output per liter of displacement went up from 118-horsepower in the V12 to 146-horsepower in the V6. Engineers were also able to increase the piston area output which is the measure of output delivered by each individual cylinder by 65-percent from 54-horsepower to 90-horsepower. The 3.7-liter V6 TDI is an extreme piece of engineering and art and would not be possible without the major engineering breakthroughs developed by Audi Sport engineers and their partners.