C4 powertrain
From its launch in late 1994, the Audi S6 was powered by a 2226 cc turbocharged inline five-cylinder petrol engine (parts code prefix: 034, identification code: AAN) with a Bosch Motronic electronic engine control unit (ECU), producing a motive power output of 169 kW at 5,900 rpm, and 258 lbft at around 1,950 rpm,[2][3] whilst consuming high octane "Super Plus" 98RON unleaded petrol.
The S6 has a top speed of 241 km/h, and can accelerate from 0 to 60 mph (97 km/h) in 6.1 seconds, 0 to 100 km/h in 6.7 seconds, and 0 to 160 km/h in 17.5 seconds.
The vehicle was available with a standard six-speed manual transmission (five-speed only in North America) and with the four-plus-one-speed automatic (the fifth "gear" called a 'lockup' gear, what reduced the RPM by ~400 at highway speed with cruise control on) as well, with the Audi's dynamic Torsen T-1 quattro permanent four-wheel drive system.
Audi made a 4.2-litre V8 engine (parts code prefix: 077, identification code: AEC) with a Bosch Motronic ECU available as an option in the original European S4s, and made the decision to continue to do so with the S6, making a version of the 4.2 available as an optional upgrade over the 2.2-litre inline five-cylinder turbo. The V8 produces 213 kW at 5,800 rpm and 400 Nm at 4,000 rpm. The V8 version can accelerate from 0 to 100 km/h (62 mph) in 5.9 seconds, and reach a top speed of 249 km/h.[4]
Unlike the five-cylinder turbocharged version, the V8-powered S6 was supplied with a four-plus-one-speed automatic transmission as standard, but kept the quattro four wheel drive. A six-speed manual gearbox was also available as an option.
C4 brakes, wheels and tyres
The C4 braking system included radially ventilated disc brakes front and rear; with 314 mm diameter by 30 mm thick discs, with two-piston floating Girling calipers bearing the interlocking four-ringed Audi logo, and four individual pads per caliper up front, and 269 mm by 20 mm discs with Lucas single-piston sliding calipers at the rear. Bosch Anti-lock Braking System (ABS) with EDS was also standard.
Standard wheels were 7½Jx16 "Avus" cast aluminium alloy wheels with 205/55 R16 tyres. An optional 7½Jx16 five-arm alloy wheel, with 205/55 R16 tyres, an 8Jx16 five double-spoke alloy, an 8Jx17 10-spoke alloys "Bolero" were also available with 225/45 R17 tyres.
C4 exterior
Changes to the exterior of the C4 S6 over the standard A6 include flared front wheel arches, an enlarged front spoiler with additional air inlets, larger diameter twin exhaust pipes, and S6 badging on the grille and rear.
Audi S6 Plus
As a swan song to the C4 platform, an even more powerful, limited-production Audi S6 Plus (Typ Q1) was briefly available to European customers. The S6 Plus, developed by Audi's wholly owned high performance subsidiary, quattro GmbH was available for sale during the 1997 model year only (production from June 1996 to October 1997). A total of 952 cars were produced – 855 Avant, and 97 saloons.
It was powered by another version of the 32-valve (four valves per cylinder) 4.2-litre V8 engine (parts code prefix: 077, identification code: AHK, later to be seen in the Audi S8 as AKH). Audi's performance division reworked key parts of the internal combustion engine, increasing the motive power to 240 kW. It was only available with a revised six-speed manual transmission (parts code prefix: 01E, identification code: DGU) (gear ratios - 1st: 3.500, 2nd: 1.889, 3rd: 1.320, 4th: 1.034, 5th: 0.857, 6th: 0.730), with a final drive ratio of 4.111.
Further revisions were made to the suspension, brakes and wheels. The front brake discs were enlarged to 323 mm in diameter by 30 mm thick. Standard wheels were 8Jx17 6-spoke "Avus" cast aluminium alloy wheels with 255/40 R17 tyres on them, with an optional 7Jx16 alloy wheel for use with winter tyres was also available.
The S6 Plus saloon could accelerate from 0 to 100 km/h in 5.6 seconds, with the Avant a tenth of a second slower at 5.7 seconds.
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