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The original Audi C5 RS 6 Quattro (Typ 4B) was the top-of-the-line user of the Volkswagen Group C5 platform (1997–2004), and was initially available as a five-door five-seat Avant - Audi's name for an estate or station wagon. A four-door five-seat saloon/sedan followed shortly after the launch of the Avant. Derived from the Audi C5 S6 (itself derived from the Audi C5 A6), the RS 6 also shares the aluminium structure from the firewall and forward with the…
The original Audi C5 RS 6 Quattro (Typ 4B) was the top-of-the-line user of the Volkswagen Group C5 platform (1997–2004), and was initially available as a five-door five-seat Avant – Audi’s name for an estate or station wagon. A four-door five-seat saloon/sedan followed shortly after the launch of the Avant. Derived from the Audi C5 S6 (itself derived from the Audi C5 A6), the RS 6 also shares the aluminium structure from the firewall and forward with the C5 A6s with V8 engines (A6 4.2 V8 Quattro, S6 saloon/Avant). It was manufactured from July 2002 through to September 2004.
Official performance figures for the Avant, whilst consuming the recommended high octane 98 RON “Super Plus” unleaded petrol indicate the 0-100 kilometres per hour (62.1 mph) dash would be completed in 4.6 seconds (s), reaching 200 km/h (124.3 mph) in 22.8 seconds (22.6 s for the saloon). Official figures state an electronically limited top speed of 250 km/h (155.3 mph), although most “RS” owners report that the speed limiter is rather liberal on all RS cars, with genuine ‘limited’ top speeds of 270 km/h (167.8 mph) being possible to achieve. Using a lower octane-rated petrol, such as the standard 95 RON “Premium” unleaded will reduce the engine power output, and have logical reduction in performance.
Luggage capacity, measured according to the VDA block method in the Avant ranges from 455 litres (16.07 cu ft), to 1,590 litres (56.15 cu ft) with the rear seats folded down. For the saloon, the boot holds 424 litres (14.97 cu ft).
For the C5 RS 6 powertrain detail, the engine is an all-aluminium alloy 4,172 cubic centimetres (254.6 cu in) twin-turbocharged (‘biturbo’), double overhead camshaft, 5 valve per cylinder version of Audi’s 4.2-litre 90° V8 petrol engine (parts code prefix: 077, identification code: BCY), developed and manufactured in Germany and the UK by quattro GmbH and Cosworth Technology (now known as MAHLE Powertrain). With the addition of the two turbochargers (one per cylinder bank), the power output of the V8 engine was increased to 331 kW (450 PS; 444 bhp) at 5,700 to 6,400 rpm, and generated 580 N⋅m (428 lbf⋅ft) of torque. The combination of the 4.2-litre V8, variable inlet valve timing, and twin turbochargers gave the RS 6 an exceptionally wide power band, with peak torque available from 1,950 to 5,600 rpm.
Further detail of the engine includes fully sequential electronic multi-point fuel injection with intake manifold-sited fuel injectors,[4] mapped direct ignition system[5] with solid-state high voltage distribution using eight individual single-spark ignition coils and NGK longlife spark plugs, and three knock sensors. Engine management uses a Bosch Motronic[6] ME 7.1.1 engine control unit, which controls all functions of the engine operation; including fuel delivery, ignition system, valve timing, emissions control systems, and torque reduction control—the latter operating in conjunction with the Bosch ESP 5.7 Electronic Stability Programme, as part of the “Anti Slip Regulation” (ASR) traction control system. The engine is compliant with the European Union Euro3 (EU3) standard, and includes two close-coupled primary catalytic converters (CATs), two underfloor main CATs, and four heated oxygen sensors which manage the cylinder bank selective lambda control. This results in a CO2 emissions rating of 350 g/km for the Avant and saloon in standard configuration.
It has an electronically controlled five-speed ZF 5HP24A tiptronic automatic transmission (parts code prefix: 01L, identification code: GAG) (gear ratios—1st: 3.571, 2nd: 2.200, 3rd: 1.505, 4th: 1.000, 5th: 0.804), with lock-up torque converter in all forward gears. It has “hill-detection” capability, and despite many press articles stating that the gearbox was programmed to “blip” the throttle for downshifting gear changes, no UK owners have ever found this feature to be present. The transmission control unit ECU incorporates “fuzzy logic” with its “Dynamic Shift Programme” (DSP), with the shift pattern adapting to suit individual driving styles. ‘Tiptronic’ manual control can be achieved with either the floor-mounted gear shift lever or the steering wheel-mounted ‘paddles’.
The RS 6 was only available with Audi’s Torsen-based Quattro permanent four-wheel drive, utilising the Torsen T-2 dynamic ‘automatic torque biasing’ (ATB) centre differential (diff), a modified unit which was being used in the 6.0-litre W12-powered Audi D3 A8. The torque from the engine is first routed from the gearbox output shaft to the Torsen centre diff, and then automatically divided and apportioned between the front and rear axles.
The front and rear axle differentials (ratio: 3.197, rear axle identification code: GGW) are a conventional “open” type but utilise an “Electronic Differential Lock” (EDL). EDL is an integrated additional function of the Bosch Electronic Stability Programme (ESP) system, and works by monitoring and comparing the individual wheel speeds across an axle, and braking an individual wheel which is sensed to have lost traction (spinning), thus transferring torque across the axle to the wheel/tyre which does have grip. “Anti-Slip Regulation” (ASR), more commonly known as traction control system[7] completes the Bosch ESP-related driver aids.
Utilising the same fully independent four-link front suspension, and double wishbone rear, as its related A6 and S6, the RS 6 was lowered by 20 millimetres (0.79 in), with a 30% stiffer spring rate, and 40% increased compression damping. The RS6 also served as the debut model for Audi’s “Dynamic Ride Control” (DRC) system. The DRC system is mainly mechanical, and uses a pump to provide additional pressure to individual dampers (shock absorbers) during cornering, acceleration or braking; to counteract rolling and pitching. The system can adjust the stiffness at each individual damper constantly; to maintain both a comfortable ride on straight roads, and a high level of poise and grip when cornering hard, accelerating, or braking. The DRC’s main advantage is that it operates without the need for complicated electronics, as required in similar systems from Mercedes-Benz and other competitors. Its main drawback is that the DRC dampers have been known to fail (leaking fluid from the cross-linked circuits), which can affect the handling and ride quality of the vehicle; some owners have reported needing multiple replacements of faulty DRC units and many drivers have opted to replace the system with simpler and more reliable aftermarket coil-over suspension.
The front brakes feature fixed Brembo 8-piston monoblock brake calipers, working with radially vented and cross-drilled brake discs, sized at 365 millimetres (14.4 in) in diameter, by 34 mm (1.34 in) thick. The rear features single-piston floating ATE calipers with integrated cable-operated parking brake mechanism, mated to radially vented disc and cross-drilled, sized 335 mm (13.2 in) by 22 mm (0.87 in). Front and rear brake calipers are finished in a high-gloss black paint, with the fronts incorporating the Audi “RS” logo. Both front and rear discs are held in by metal pins to the lightweight disc hub, and allow 1.0 mm (0.039 in) of lateral thermal expansion from the hub centre.
Bosch ESP 5.7 Electronic Stability Programme,[8] with Anti-lock Braking System (ABS),[9] Electronic Brakeforce Distribution (EBD), and Brake Assist (BA) was standard fitment.
There were a total of three original equipment manufacturer (OEM) wheel and tyre types available with the RS 6. In Europe and elsewhere, 19-inch wheels were standard, with an optional 18-inch package. In the U.S. market, the 18-inch package was the only available offering. An 18-inch winter package, with Dunlop SP Winter Sport M3 tyres (225/45 ZR18 95V) was universally available.
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