Audi Q7 V12 TDI
From Audi press: For two decades Audi has driven forward the advancement of diesel technology – from the very top. Now the brand with the four rings is presenting another world first: the first V12 TDI in a passenger vehicle. The diesel, which generates an output of 368 kW (500 hp) and 1,000 Nm of torque (737.56 lb-ft) from a capacity of six liters, gives the new Audi Q7 V12 TDI quattro the performance of a sports car. It catapults from zero to 100 km/h (62.14 mph) in only 5.5 seconds and has an electronically capped top speed of 250 km/h (155.34 mph). The V12 diesel is opening up entirely new horizons in the diesel sector. The big-performance SUV from Audi completes all intermediate sprints with fascinating ease; in every driving situation it boasts superior reserves of power. The engine captivates its drivers not only with its sheer inexhaustible power but also with its highly cultivated manner of operation – the subtle engine sound takes on a voluminous, strong note when the throttle is open. In terms of fuel consumption the six-liter TDI, which features a completely redeveloped common rail injection system, requires an average of only 11.3 liters/100 km (20.82 US mpg), substantially less than the gasoline units produced by the competition. No competitor is able to match this achievement.
Audi is taking TDI technology to new heights: the Audi Q7 V12 TDI quattro is the world’s most powerful diesel-engined SUV, its powerplant another technical milestone. With a completely redeveloped common rail injection system the twelve-cylinder delivers a mighty 368 kW (500 hp) and 1,000 Nm (737.56 lb-ft) of torque from a capacity of six liters – giving the big SUV the performance of a sports car.
The world’s first V12 diesel engine in a series-production vehicle moves this ultimate, high-performance SUV with supreme confidence and composure. On demand, the six-liter engine catapults the Audi Q7 from zero to 100 km/h (62.14 mph) in 5.5 seconds like a top-class sports car. Speed is electronically capped at 250 km/h (155.34 mph).
The new twelve-cylinder TDI, produced at the Györ plant in Hungary, is a member of the current family of V diesel engines from Audi, which up to now was restricted to 6 and 8-cylinder units. As with other inline engines, it has a spacing of 90 millimeters (3.54 inches) between cylinder centers. Yet its included angle is 60 degrees, not 90 – the reason is that on this layout of V12, no free inertial forces or mass moments of inertia can then occur. The results are refined in every respect.
The 83.0-millimeter bore (3.27 inches) and 91.4-millimeter stroke (3.60 inches) of the twelve-cylinder are the same as the 3.0 TDI, producing a total displacement of 5,934 cc. The two cylinder banks are positioned opposite one another with an offset of 17 millimeters (0.67 inch). Measuring 684 millimeters (26.93 inches) in length the powerful engine is extremely compact, only 166 millimeters (6.54 inches) longer than the V8 TDI. This dimension was the key prerequisite for integrating the V12 into the Audi Q7.
The V12 TDI crankcase is made from cast iron with vermicular graphite – a high-tech material referred to as GJV-450 that is already used on the V6 and V8 TDI engines. GJV-450, made by a patented casting process, is about 40 percent more rigid and 100 percent more fatigue-resistant than gray cast iron. This enabled the developers to make its walls thinner, cutting its weight by around 15 percent compared with conventional gray cast iron. The crankshaft forged from chrome-molybdenum alloy steel is mounted with the aid of an extremely rigid main bearing bridge made of nodular cast iron. The forged connecting rods are cracked and the pistons are made of aluminum.
The visual styling of the Audi Q7 V12 TDI quattro gives the vehicle an unmistakable look. Daytime running lights consisting of twelve white LEDs per headlight announce the vehicle’s presence even at a distance. They are located on the upper edge of the air intake slots, replacing the turn signals that were moved to the bi-xenon headlights. Further honing the vehicle’s profile are vertical chromed bars in the grid of the single-frame radiator grill and an underbody protector made of stainless steel. The newly designed bumper groups the highly polished side air intake slots into large units.