The S6, S6 Avant and S7 will use a 420hp version, which provides a constant 406 lb-ft of torque from 1400 to 5300rpm, accelerating the car from 0-62mph) in 4.8 seconds.
The new S8 will generate the full 520hp from the same engine, delivering 480 lb-ft to the crankshaft between 1700 and 5500rpm. The result is 0-62mph in 4.2 seconds, and all cars have an electronically-limited top speed of 155mph. The engine replaces the 5.2-liter V10 as part of Audi's downsizing policy, offering sportier performance while reducing fuel consumption by as much as 25 percent. Average fuel consumption is 24.25mpg US in the S6, for example. A number of technologies contribute to these result, including the recuperation and start-stop systems as well as the new "cylinder on demand" management system in the S8. When the V8 de-activates four cylinders under part load, the Active Noise Cancellation system (ANC) is activated. Four microphones integrated into the headlining record the noise in the cabin, which is then analyzed and if the computer detects intrusive sound elements, it broadcasts an anti-phase sound through the car's sound system. This combines with the intrusive noise to largely cancel it out.
Independent of this, active, electronic engine bearings use targeted counter-pulses to attenuate low-frequency vibrations. Furthermore, the engine uses a sound actuator, flaps in the exhaust system, the engine shroud and a newly developed two-mass flywheel with a centrifugal force pendulum in the seven-speed S tronic transmission to also contribute to the sound and smoothness of the engine.
The new S6 models come with standard adaptive air suspension sport. The tuned suspension with variable damping lowers the body 0.4" and provides both precise handling and comfort. The powerful disc brakes have matte black calipers while carbon/ceramic discs are an option.
The S6 comes with 19x8.5" wheels shod with 255/40-series tires. However, seven different 19- or 20-inch wheels are available as options.
The Audi drive select system comes standard in the new S6 models. Among others, it modifies the gas pedal, gearshift points, steering assistance and adaptive air suspension according to five stages. The optional sport differential and the dynamic steering, which varies its ratio as a function of speed, can also be integrated into the system.
The cars are roughly 20 percent aluminum, giving the S6 a kerb weight of 4178 lb. Their single-frame grille sports aluminum applications and chromed horizontal bars. Another chrome strip adorns the front bumper. The exterior mirrors feature aluminum-look housings, while the side sills are distinctively shaped.
The S6 sedan has a trunk spoiler; the Avant has a roof spoiler. With both models, the rear diffuser is platinum gray with an aluminum-look offset edge. The four chrome-tipped tailpipes are elliptical.
The S models are available in a choice of eight colors, including the exclusive shades Estoril Blue crystal effect and Prism Silver,crystal effect. The body is decorated with S6 and V8T badges.
The Audi S7 also uses a hybrid aluminum construction, weighing roughly 15 percent less than a comparable all-steel body. Lightweight components include the electrically operated rear hatch. The other details, colors and badging is the same as the S6.
The Audi S8 will be launched in spring 2012. With its new 520hp V8 twin-turbo, consumption has decreased nearly 23 percent over the previous V10 model despite a 70hp) increase in output.
The standard, S-specific wheels measure 20x9" and are shod with 265/40-series tires. Audi will offer five additional wheels as options, four of which have a 21" diameter.
The ventilated disc brakes measure 15.75" up front and 14.37" at the rear. The matte-black calipers bear S8 logos but the optional carbon /ceramic discs save 11 lb per corner and use anthracite gray calipers.
The S8 weighs a relatively low 4354 lb thanks to is Audi Space Frame body made almost entirely from aluminum. Only the B-pillars are high-strength steel. In fact, the body weighs just 509 lb, compared to conventional steel construction that would be around 220 lb heavier.
The single-frame grille is platinum gray and its eight double bars are covered in chrome. An aluminum-look blade makes the bumper appear sharper, and there are gloss-black slats and aluminum-look ribs in the side air intakes.
On the sides are body-color trim strips on the sills, aluminum door handle strips and polished aluminum-look mirror housings. The rear diffuser includes a blade with a two-layer aluminum-look finish offset by parts in platinum gray. The exhaust system ends in two oval dual tailpipes in a chrome-look finish.
S8 or V8 T badges can be found in the front, on the back and on the sides. The color range includes 13 shades, two of which - Daytona Gray and Prism Silver - are reserved for the S8.
The interior shines with craftsman-like fit and finish and small yet effective accents. The multi-way, power-adjustable comfort sport seats have been designed exclusively for the S8. They are optionally available with exclusive seat upholstery in quilted lunar silver. The stitching and piping are in contrasting steel gray, while the upper inlays on the instrument panel and tiptronic selector lever present the material Carbon Atlas.
The leather multifunction sport steering wheel has color-contrasting stitching and an S8 emblem, which can also be found on the instruments. Typical of the Audi S models, these have gray dials with white needles - a design which is repeated in the classic analogue clock. The illuminated door sill trims with the S8 logo are a further eye-catcher. The display of the driver information system and the MMI monitor greet the driver with special S8 screens. The shift paddles and pedals are in an aluminum-look finish; a red ring frames the start button.
The Bang & Olufsen Advanced Sound System with its 1400 watt amplifiers and 19 speakers is another optional extra.