Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 Cabriolet (8E,B6) |
| Type (Engine) | 4.2i V8 40V (344 Hp) quattro |
| Start of production | 2003 |
| End of production | 2004 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 19.9 l/100 km (11.8 US mpg, 14.2 UK mpg, 5 km/l) |
| Fuel consumption (extra urban) | 10.3 l/100 km (22.8 US mpg, 27.4 UK mpg, 9.7 km/l) |
| Fuel consumption (combined) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| CO2 emissions | 331 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.9 sec |
| Acceleration 0 – 62 mph | 5.9 sec |
| Acceleration 0 – 60 mph | 5.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 5.4 kg/Hp, 185.4 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 221 Nm/tonne |
| Power | 344 Hp @ 7000 rpm |
| Power per litre | 82.6 Hp/l |
| Torque | 410 Nm @ 3500 rpm (302.4 lb.-ft. @ 3500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | BBK |
| Engine displacement | 4163 cm3 (254.04 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 84.5 mm (3.33 in.) |
| Piston Stroke | 92.8 mm (3.65 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 5 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 9 l (9.51 US qt | 7.92 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 1855 kg (4089.57 lbs.) |
| Max. weight | 2315 kg (5103.7 lbs.) |
| Max load | 460 kg (1014.13 lbs.) |
| Trunk (boot) space – minimum | 246 l (8.69 cu. ft.) |
| Trunk (boot) space – maximum | 315 l (11.12 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| Length | 4573 mm (180.04 in.) |
| Width | 1778 mm (70 in.) |
| Height | 1391 mm (54.76 in.) |
| Wheelbase | 2654 mm (104.49 in.) |
| Front track | 1523 mm (59.96 in.) |
| Rear (Back) track | 1523 mm (59.96 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle | 11.5 m (37.73 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 6 |
| Type of gearbox | Manual transmission |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent on trapezoidal lever |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 235/40 R18 |
| Wheel rims size | 8J x 18 |
The Audi S4 Cabriolet (8E, B6) 4.2i V8 40V quattro, produced from 2003 to 2004, represented the high-performance convertible offering within the B6 generation of the Audi A4 family. Positioned as the open-top variant of the S4 sedan, it combined the potent 4.2-liter V8 engine with Audi’s renowned quattro all-wheel-drive system. This model occupied the premium segment of the convertible market, appealing to drivers seeking a blend of exhilarating performance and open-air luxury. It was built on the Volkswagen Group’s B6 platform (internally designated 8E), shared with the Audi A4, and offered a more sporting experience than the standard A4 Cabriolet.
Powertrain & Engine Architecture
The heart of the S4 Cabriolet was the BBK engine, a 4.2-liter naturally aspirated V8. This engine, a descendant of the unit first seen in the Audi RS4 (B5), featured a 90-degree V-angle and utilized a cast aluminum block with cast iron cylinder liners. It employed multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain with five valves per cylinder (40V). This configuration allowed for a broad powerband and a distinctive V8 soundtrack. The engine produced 344 horsepower at 7000 rpm and 302 lb-ft of torque at 3500 rpm. The six-speed manual transmission was standard, delivering power to all four wheels via Audi’s quattro permanent all-wheel-drive system. The quattro system utilized a Torsen center differential, providing variable torque distribution between the front and rear axles for optimal traction.
Driving Characteristics
The 4.2-liter V8 and manual transmission combination provided a thrilling driving experience. Acceleration from 0-60 mph was achieved in approximately 5.6 seconds, and the car felt responsive and eager to rev. The quattro all-wheel-drive system instilled confidence in various weather conditions, providing excellent grip and stability. Compared to the standard A4 Cabriolet, the S4 offered significantly more power and a more engaging driving experience. While the manual transmission was the only option, it was well-matched to the engine’s characteristics, offering precise shifts and a direct connection to the powertrain. The gear ratios were tuned for both acceleration and highway cruising, providing a balance between performance and comfort.
Equipment & Trim Levels
The S4 Cabriolet came well-equipped as standard. Interior features included sport seats upholstered in leather, a leather-wrapped steering wheel and shift knob, and aluminum trim accents. Standard exterior features included a unique S4 body kit, including front and rear bumpers, side skirts, and a rear spoiler. Optional extras included Recaro sport seats, a premium sound system, navigation system, and various interior trim options. The S4 Cabriolet was positioned as a premium offering, and its price reflected that.
Chassis & Braking
The S4 Cabriolet featured a sport-tuned suspension compared to the standard A4 Cabriolet. The front suspension utilized independent multi-link technology, while the rear suspension employed an independent trapezoidal lever setup. This configuration provided a good balance between ride comfort and handling precision. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) was standard. The chassis was reinforced compared to the standard A4 Cabriolet to improve rigidity and handling.
Market Reception & Comparison
The Audi S4 Cabriolet (8E, B6) was generally well-received by automotive critics. It was praised for its powerful engine, engaging driving dynamics, and luxurious interior. However, its fuel economy was often criticized, as the 4.2-liter V8 was a thirsty engine. Compared to other performance convertibles of the time, such as the BMW 3 Series Convertible and the Mercedes-Benz CLK Cabriolet, the S4 offered a unique combination of performance, luxury, and all-wheel-drive capability. The manual transmission was favored by enthusiasts, while some potential buyers may have preferred the convenience of an automatic transmission, which was not offered.
Legacy
The BBK 4.2-liter V8 engine, while known for its performance, can require significant maintenance as it ages. Common issues include oil leaks, timing chain wear, and carbon buildup. The quattro all-wheel-drive system is generally reliable, but the differential can require servicing. Today, the S4 Cabriolet (8E, B6) is considered a desirable modern classic. Well-maintained examples command a premium in the used car market. Its combination of performance, luxury, and open-air driving enjoyment continues to appeal to enthusiasts. The car represents a high point in Audi’s engineering and design, and it remains a rewarding driving experience.
