Audi A8, 2014
The superior design, hand-built quality, systematic lightweight construction and an abundance of high-end technologies: Audi presents the comprehensively updated A8, its successful flagship, at the 2013 IAA in Frankfurt am Main. The engine lineup has once again become more powerful and efficient; new assistance systems and the innovative Matrix LED headlights make driving more composed than ever.
The A8 makes Audi among the innovation leaders in the worldwide luxury segment, the most demanding automobile category. One great strength of the big sedan is its low weight. The Audi A8 3.0 TFSI with the normal wheelbase has a curb weight of just 1,830 kilograms (4,034.46 lb) - best-in-class for models with all-wheel drive.
The key factor in its lightweight construction is the body, which except for the B-pillars is made entirely of aluminum. An Audi Space Frame (ASF) design, it tips the scales at just 231 kilograms (509.27 lb), roughly 40 percent less than a comparable steel construction. The ASF body also makes it possible to reduce weight in many other areas, from the brakes to the fuel tank.
Length (5.14 meters [16.86 ft]), wheelbase (2.99 meters [9.81 ft]), width (1.95 meters [6.40 ft]) and height (1.46 meters [4.79 ft]) remain unchanged, giving the Audi A8 the sportiest look in the segment. The A8 L gains an additional 13 centimeters (5.12 in) in both length and wheelbase. Equipped with a TDI engine, both body variants have a drag coefficient of just 0.26. This same figure with a TFSI engine is 0.27.
In updating the A8, Audi paid great attention to the acoustics. Additional noise damping measures reduce the already low interior noise level even further. The trunk now has a maximum of 520 liters (18.36 cubic feet) and can be loaded substantially better thanks to the altered layout. The optional power trunk closing assist means that the entire car can be locked at the touch of a button.
Dynamic, harmoniously elegant - the big sedan's design has become even more expressive. The engine hood, the single-frame grille and the front bumper are even more sculptured and precise; the lower edge of the headlights is straight. In the German market, LED headlights are standard in all models with a V8 engine.
Audi also offers the headlights with optional Matrix LED technology, which sets new benchmarks with respect to design and technology. With these headlights, the high-beam unit is made up of 25 individual segments. The small light-emitting diodes, which work in conjunction with lenses and reflectors connected in series, are activated and deactivated or dimmed individually according to the situation. This enables the system to react precisely to other cars, which it recognizes using a camera, and always illuminate the road brightly. Additional features of the new headlights are the intelligent cornering light, new-look daytime running lights and dynamic turn signals.
The LED lights at the rear of the new Audi A8 have also become flatter and are joined together by a continuous chrome strip. In all models except the S8, the redesigned bumper houses two rhomboid tailpipes. Chrome strips in the lower section of the body, fine inserts in the door handles and high-gloss black window frames round out the distinctive features. There is a choice of 12 exterior colors, including five new ones. Wheels are available in sizes up to 21 inches with 275/35-series tires.
The engines: more power with greater efficiency
Besides the S8, A8 L W12 quattro and A8 hybrid models, the new Audi A8 will be offered in the German market with two TFSI gasoline engines and two TDI units. A package of measures to reduce friction reduce fuel consumption by as much as ten percent, and most engines have also seen an increase in power. All engines already satisfy the requirements of the Euro 6 standard.
Under the hood of the A8 3.0 TFSI quattro is a V6 engine whose mechanical compressor can be deactivated. Power output is now 228 kW (310 hp), an increase of 15 kW (20 hp). The V6 accelerates the standard wheelbase version of the sedan from 0 to 100 km/h (62.14 mph) in 5.7 seconds. Top speed is electronically restricted to 250 km/h (155.34 mph). It consumes on average 7.8 liters per 100 kilometers (30.16 US mpg), corresponding to 183 grams CO2 per kilometer (294.51 g/mile).
The twin-turbo V8 in the A8 4.0 TFSI quattro now produces 320 kW (435 hp), 11 kW (15 hp) more than before. Key performance data: from 0 to 100 km/h (62.14 mph) in 4.5 seconds; average fuel consumption 9.1 liters per 100 kilometers (25.85 US mpg), corresponding to 213 grams CO2 per kilometer (342.79 g/mile). The Audi cylinder on demand (COD) system plays a major role in this efficiency by deactivating four of the eight cylinders under part load.
With average fuel consumption of 5.9 liters per 100 kilometers (39.87 US mpg), corresponding to 155 grams CO2 per kilometer (249.45 g/mile), the 3.0 TDI clean diesel set a new record in the all-wheel-drive luxury segment. The V6 diesel engine's output has been bumped up 6 kW (8 hp) to 190 kW (258 hp). It now accelerates the sedan from 0 to 100 km/h (62.14 mph) in 5.9 seconds.
When it comes to torque, the 4.2 TDI clean diesel tops the A8 lineup, delivering 850 Nm (626.93 lb-ft) to the crankshaft. Audi has boosted its output by a whopping 25 kW (34 hp) to 283 kW (385 hp). Equipped with the powerful V8 diesel, the A8 completes the standard sprint in 4.7 seconds, and average fuel consumption is 7.4 liters per 100 kilometers (31.79 US mpg), which corresponds to 194 grams CO2 per kilometer (312.21 g/mile).
Powertrain: tiptronic and quattro
All variants of the model series are equipped with a fast and smooth-shifting, eight-speed tiptronic. The transmission, which can be controlled electronically using an elegant selector lever as well as paddles on the steering wheel, works in conjunction with the quattro permanent all-wheel drive system. The latter is standard in the A8 series (except for the A8 hybrid). If desired, Audi will combine quattro all-wheel drive with the optional sport differential on the rear axle. The power can then be distributed between the rear wheels as needed for even more agile handling. The sport differential is standard in the S8 and the A8 4.2 TDI clean diesel quattro.
The Audi A8 owes its sporty character in large part to the sophisticated chassis. Axle load distribution is balanced, and all wheel control arms are aluminum. The Audi drive select system, which enables the driver to influence the function of various technical modules such as the steering and the accelerator characteristic, is standard. It also controls the adaptive air suspension with adaptive damping, which adjusts the body's ride height to the speed driven. Audi also offers the air suspension with a sporty setup upon request.
The power steering now uses an efficient electromechanical drive that reduces fuel consumption and also enables the use of numerous assistance systems. The optional dynamic steering varies its ratio with the car's speed. All brake discs are internally vented. Carbon fiber ceramic brake discs are available for V8 models, the S8 and the A8 L W12.
One new component of Audi's lightweight construction technology are the 9J x 20 aluminum-technology wheels. These are based on forged support wheels that are joined via a special process to a ten-spoke design element of high-strength polymer. This technology gives designers the freedom to use large-area, yet three-dimensional designs.
