Audi S8
 | |
| Manufacturer | AUDI AG |
|---|---|
| Production | 1994–present |
| Assembly | Neckarsulm, Germany |
| Class | Large luxury car, sports sedan |
| Body style | 4-door saloon/sedan |
| Layout | Longitudinal front engine, quattro permanent four-wheel drive |
| Platform | Volkswagen Group D platform series |
| Related | Audi A8 |
The Audi S8 quattro is a high-performance version of the German luxury automaker Audi's flagship car, the full-size Audi A8. The S8 is produced at Audi's Neckarsulm'aluminium plant', and it was introduced in September 1994. Like the A8, the S8 is only available as a four-door saloon/sedan, and both generations have been constructed from an all-aluminium monocoque, dubbed the "Audi Space Frame" (ASF), the S8 using the standard wheelbase platform, and is not available in the long-wheelbase of the A8L.
The S8, like all Audi "S" models, is fitted as standard with Audi's trademark quattro four-wheel drive (4WD), with the S8 using the Torsen-based permanent 4WD system.
D2 (Typ 4D, 1994-2003)
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| Production | September 1994–September 2002 |
|---|---|
| Platform | Volkswagen Group D2 |
| Engine | 4.2 L V8 DOHC |
| Transmission | 6-speed manual, 5-speed ZF 5HP24 tiptronic automatic |
| Wheelbase | 2,880 mm (113.4 in) |
| Length | 5,034 mm (198.2 in) |
| Width | 1,880 mm (74.0 in) |
| Height | 1,418 mm (55.8 in) |
| Kerb weight | 1,845 kg (4,068 lb) |
| Related | Audi A8 (D2) |
In September 1994, according to the official electronic parts catalogue for the Volkswagen Group, Audi introduced the Audi S8 4.2 quattro (Typ 4D) into the European market with a six-speed manual transmission, and a year later with tiptronic five-speed automatic transmission - a high-performance version of the Audi A8 in the vein of Mercedes-Benz AMG models, sharing the A8's all-aluminium monocoque "Audi Space Frame" (ASF), and Volkswagen Group D2 platform.
In the UK the S8 was only available with an automatic gearbox.
At the same time of the A8's facelift in late 1999, the S8 received the same cosmetic upgrades. This was the first model to be introduced to the North American market.
Production of this original S8 ended in September 2002, shortly before the introduction of the current D3-platform A8.
The D2 S8 was also featured in the 1998 film Ronin.
D2 powertrain
Motive power in the D2 S8 powertrain featured an uprated, 250 kilowatts (340 PS; 335 bhp) version of the standard 4 Valves per Cylinder 4,172 cubic centimetres(254.6 cu in) 90° V8(AKZ) petrol engine (parts code: 077, identification codes: AKH, AHC). From late 1999, the engine was given a further 8 valves (now 5 valves per cylinder) and compression bump to 11.0:1 from 10.8:1. Power increased to 265 kilowatts (360 PS; 355 bhp) at 7,000 rpm, and 430 newton metres (317 ft·lbf) of torque at 3,400 rpm (identification codes: AQH, AVP, AYS, BCS). The AHC Code engine was the only 4 valve V8 and featured different exhaust cams, Different Ecu tune, and a higher compression compared to the ABZ(300)bhp engine of the A8.
A sports-recalibrated version of the ZF 5HP24 five-speed tiptronic automatic transmission (parts code: 01L, identification codes: DYM, ECX) (gear ratios - 1st: 3.571, 2nd: 2.200, 3rd: 1.505, 4th: 1.000, 5th: 0.804), featuring "Dynamic Shift Programme" (DSP) was standard. European-market models also had a six-speed manual transmission option (parts code: 01E, identification code: DGV).
Torsen T-2 based quattro permanent four-wheel drive was also standard. Final drive ratio (for automatic transmission) is 3.730.
D2 suspension, brakes, wheels & tyres
A retuned, 20 millimetres (0.8 in) lowered sports suspension included a 30% stiffer spring rate and 40% more compression damping in the shock absorbers. Speed-sensitive "servotronic" power assisted steering was also standard.
The brakes featured Bosch ABS 5.3 Anti-lock Braking System, with Electronic Brakeforce Distribution (EBD), and worked radially ventilated front discs of 345 millimetres (13.58 in) in diameter by 30 mm (1.18 in) thick. The rear vented discs measured 280 mm (11.02 in) by 22 mm (0.87 in). From 2002, an upgraded Bosch ESP 5.7 Electronic Stability Programme became standard fitment.
Standard alloy wheels were 8Jx18" cast aluminium alloy "Avus" 6-spoke style, with 245/45 ZR18 Dunlop SP Sport 8000 or Bridgestone Potenza RE040 performance tyres. From 1999 model year, an 8.5Jx20" polished "9-spoke RS" wheel became an option, shod with 255/35 ZR20Michelin Pilot Sport tyres. In 2003, 8Jx18" polished 9-spoke RS wheels became a no-cost option road wheel.
D2 body and interior
Whilst the S8 shared the aluminium monocoque of the A8, subtle detail included solid aluminium alloy door mirror housings, chrome-effect beltline and lower front grille trim, and polished twin exhaust pipes, along with subtle "S8" badging. 14-way power adjustable and heated sports front seats with memory function complement heated rear seats.
D3 (Typ 4E, 2006-2010)
 2007 Audi D3 S8 (US) | |
| Production | 2006–2010 |
|---|---|
| Platform | Volkswagen Group D3 |
| Engine | 5.2 L V10 FSI DOHC |
| Transmission | 6-speed ZF 6HP26-A61 tiptronicautomatic |
| Wheelbase | 2,944 mm (115.9 in) |
| Length | 5,062 mm (199.3 in) |
| Width | 1,897 mm (74.7 in) |
| Height | 1,424 mm (56.1 in) |
| Kerb weight | 1,940 kg (4,277 lb) |
| Related | Audi A8 (D3) |
In the last quarter of 2005, Audi previewed the latest S8 5.2 FSI quattro (Typ 4E), based on its Volkswagen Group D3 platform stablemate, the Audi A8. Factory production commenced June 2006 and ended after 2009 along with the A8L W12, while the A8 4.2 and A8L 4.2 continued in production for the 2010 model year.
Performance
Audi's factory performance claims for the V10 S8 indicate a 0 to 100 kilometres per hour (0 to 62.1 mph) time of 5.1 seconds whilst consuming "SuperPlus" / "EuroSuper" 98 RON unleaded petrol. This places the S8 in a competitive range with the Maserati Quattroportepowered by a 430 hp 4.7 V8, the Jaguar XJR powered by a 400 hp supercharged 4.2 V8, the Mercedes-Benz S63 AMG (naturally aspirated 6.3L V8) and S600 (powered by a twin-turbo 5.5L V12), and the BMW 760Li (powered by a naturally aspirated 6.0L V12 engine).
The S8 has similar performance to Audi's own top-of-the-line A8L W12, though the W12 is more expensive ($120,000 USD for the W12 versus $96,000 USD for the S8), has more torque, and built on a longer wheelbase (which alone accounts for over 100 pounds of increased weight). Compared to the A8L W12, the S8 has sportier mechanical features such as a firmer suspension, larger alloy wheels, and ceramic brakes. The shorter wheelbase and 10-cylinder engine save weight for better handling, but at 5.4 seconds from 0-60 mph the S8 trails the W12. The S8's top speed is electronically limited to 250 kilometres per hour (155.3 mph).
D3 powertrain
Motive power in the second-generation D3 S8 powertrain features a 5.2 litre all aluminium alloy 5,204 cubic centimetres (317.6 cu in) Fuel Stratified Injection (FSI) 40-valve (four valves per cylinder) 90° V10 petrol engine (parts code: 07L, identification code: BSM). This engine is a derivative of the Gallardo's original 5.0 litre Lamborghini V10,which was also developed under the Volkswagen Group ownership.
On this Audi-only variant, compared to the Lamborghini engine, it features a longer stroke and wider bore - which increases the displacement of the engine, and produces more torque at lower revs, making it more suitable for the larger and heavier full-sized luxury Audi saloon. It produces 331 kilowatts (450 PS; 444 bhp) at 7,000 rpm, and 540 newton metres (398 ft·lbf) of torque at 3,500 rpm. The S8's version has its bore whittled out an additional two millimeters, increasing the displacement from 5.0 to 5.2 liters. It also has Audi's direct-injection system, called FSI. Maximum output is down from 493 horsepower at 7800 rpm in the Gallardo to 444 at 7000 rpm in the S8, and torque is up 22 pound-feet (398 pound-feet total), peaking 1000 rpm earlier at 3500 rpm.
The engine utilises twin chain-driven double overhead camshafts (DOHC), and variable valve timing for both intake and exhaust valves. Engine management is by way of Bosch DI-Motronic MED 9.1 electronic engine control unit, which controls the mapped direct ignition, ten individual spark coils, common rail cylinder-direct sequential multi-point fuel injection, and drive by wire throttle.
The same 5.2 V10 engine is also used in the third-generation Audi S6 (C6), but in a slightly lower state of tune where it develops 320 kilowatts (435 PS; 429 bhp).
A sports-optimised ZF 6HP26-A61 six-speed tiptronic automatic transmission (parts code: 09E, identification codes: KLW or KZK) (gear ratios - 1st: 4.171, 2nd: 2.340, 3rd: 1.521, 4th: 1.143, 5th: 0.867, 6th: 0.691) with "Dynamic Shift Programme" (DSP) and "sport" mode, withsteering wheel mounted paddle-shifters, is the only offering. Output is transmitted via Audi's trademark quattro permanent four-wheel drivesystem, initially using the Torsen T-2 50:50 dynamic centre differential, and from 2008 model year, utilising the latest Torsen T-3 asymmetric dynamic centre differential, with a 'default' torque distribution of 40% to the front axle and 60% to the rear. Final drive ratio is 4.055, and traction is assisted with Audi's "Electronic Differential Lock" (EDL) and "Anti-Slip Regulation" (ASR) (commonly known as traction control system) - both functions of the Bosch ESP 5.7 (or the later ESP 8.0) Electronic Stability Programme.
Although the Audi R8 5.2 FSI quattro (which shares the same 5.2L V10 engine as the S8 and S6) uses the S tronic® dual-clutch transmissionwhich is sportier and more responsive, the S8 was fitted with a tiptronic automatic transmission which is smoother (as the S8 is more luxury oriented) and provides better fuel economy.
D3 suspension, steering, brakes, tyres
The S8, like its related A8, utilises a multi-link suspension layout front and rear, with pressurised air springs. However, for the S8, the effective spring and damper rates are noticeably firmer, along with re-engineered suspension mounts. "servotronic" speed-dependent power assisted rack and pinion steering point the S8 in the desired trajectory.
The brake system consists of radially ventilated discs all round, the fronts sized at 385 millimetres (15.2 in) in diameter by 36 mm (1.42 in) thick, and the rears at 335 mm (13.2 in) by 22 mm (0.87 in). The discs are clamped with gloss-black painted dual-piston calipers up front, and a single-piston sliding caliper at the rear, coupled to an electro-mechanical parking brake. A Bosch ESP 5.7 (later upgraded to ESP 8.0) Electronic Stability Programme, with Anti-lock Braking System(ABS), Brake Assist, and Electronic Brakeforce Distribution (EBD) complete the brake system.
Optional "Audi ceramic" Carbon fibre-reinforced Silicon Carbide (C/SiC) composite front and rear brakes are available, which use 380 mm (14.96 in) diameter by 38 mm (1.496 in) thick drilled, radially vented, and floating SGL Carbon discs, with anthracite grey painted six-piston fixed Brembo monobloc alloy calipers with the "Audi ceramic" logo up front, and 356 mm (14.02 in) by 28 mm (1.102 in) discs at the rear.
Standard alloy wheels consist of 9Jx20" cast aluminium alloy "S design", shod with either 265/35 ZR20 99Y XL performance tyres (eitherBridgestone Potenza RE050A, or Yokohama Advan Sport), or 275/35 ZR20 102Y XL (Continental SportContact2, Dunlop SP SportMaxx, orPirelli P-Zero Nero). A direct-acting tyre pressure monitoring system (TPMS) is also standard.
D3 body and interior
The S8 includes subtle detailing to distinguish it from its related A8. The trapezoidal "single-frame"grille bears the characteristic Audi "S model" vertical strut detail which are highlighted in a chrome finish. "S8" badging is displayed front and rear, whilst "V10" badges are displayed on each front wing below the side-repeater indicators. The rear boot-lid incorporates a subtle rear spoiler, and the rear is finished with four chromed oval exhaust tailpipes.
Adaptive Xenon-plus high-intensity discharge (HID) headlamps include static turning lights, along with 'swiveling' dynamic cornering lights. Daytime running lamps are five light-emitting diodes(LEDs) incorporated into a cloverleaf designed reflector, incorporated into the main headlamphousing.
The interior equipment includes two-colour leather-clad sports seats, a widescreen colour display for the Multi Media Interface (MMI), and white illuminated needles for the instrument dials.
Other notable options include the "Advanced Parking" system, which includes a rearview camera, whose output is displayed on the colour MMI monitor, with "trajectory" lines which move in conjunction with steering wheel movements.
D3 gallery
D4 (2011-)
| Production | 2011- |
|---|---|
| Class | Luxury car |
| Engine | 4.0L V8 |
| Transmission | 8-speed automatic |
| Wheelbase | 2,992 mm (117.8 in) |
| Length | 5,150 mm (202.8 in) |
| Width | 1,949 mm (76.7 in) |
| Height | 1,460 mm (57.5 in) |
| Related | Audi A8 D4 |
It is anticipated that a third-generation Audi S8 is expected to go on sale as a 2013 model, released one year after the all-new 2011 Audi A8. As such, S8 sales ended in the 2009 model year for the United States & Canada.
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