The Audi S4 Cabriolet (8E, B7) 4.2i V8 40V, produced from August 2004 to June 2008, represented the high-performance, open-top variant of Audi’s popular S4 model. Positioned as the premium offering within the B7 S4 range, it combined the potent 4.2-liter V8 engine with Audi’s quattro all-wheel-drive system and a luxurious convertible experience. This generation S4 Cabriolet was built on the Audi/Volkswagen Group’s B7 platform, shared with models like the Audi A4 Cabriolet and Volkswagen Passat.
Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 Cabriolet (8E,B7) |
| Type (Engine) | 4.2i V8 40V (344 Hp) quattro |
| Start of production | August, 2004 |
| End of production | June, 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 19.9 – 20.0 l/100 km (11.8 US mpg, 14.2-14.1 UK mpg) |
| Fuel consumption (extra urban) | 10.3 – 10.4 l/100 km (22.8 – 22.6 US mpg, 27.4-27.2 UK mpg) |
| Fuel consumption (combined) | 13.8 – 13.9 l/100 km (17 – 16.9 US mpg, 20.5-20.3 UK mpg) |
| CO2 emissions | 331-334 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 |
| Weight-to-torque ratio | 4.5 kg/Nm |
| Power | 344 Hp @ 7000 rpm |
| 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 | 1777 mm (69.96 in.) |
| Height | 1391 mm (54.76 in.) |
| Wheelbase | 2650 mm (104.33 in.) |
| Front track | 1522 mm (59.92 in.) |
| Rear (Back) track | 1518 mm (59.76 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 |
Powertrain & Engine Architecture
The heart of the S4 Cabriolet (8E, B7) 4.2i was the BBK engine, a naturally aspirated 4.2-liter (4163 cc) V8. This engine, a descendant of the earlier 4.2 found in the B6 S4, 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 (four intake, one exhaust). The engine produced 344 horsepower at 7000 rpm and 302.4 lb-ft of torque at 3500 rpm. The six-speed manual transmission was standard, providing precise gear changes and enhancing the driving experience. The quattro all-wheel-drive system, a hallmark of Audi performance models, distributed power between the front and rear axles for optimal traction and stability.
Driving Characteristics
The 4.2-liter V8, coupled with the manual transmission and quattro all-wheel drive, delivered exhilarating performance. Acceleration from 0 to 60 mph was achieved in approximately 5.6 seconds, and the car had a governed top speed of 155 mph. The engine’s broad torque curve provided strong acceleration throughout the rev range, making it responsive in various driving situations. The manual gearbox offered a more engaging driving experience compared to the automatic options available on other S4 variants. The quattro system ensured excellent grip, particularly in adverse weather conditions, and contributed to the car’s balanced handling characteristics. However, the weight of the convertible top mechanism and the all-wheel-drive system did contribute to a slightly higher curb weight than the coupe version.
Equipment & Trim Levels
The S4 Cabriolet was well-equipped as standard, reflecting its premium positioning. Standard features included leather upholstery, sport seats, automatic climate control, a premium audio system, and xenon headlights. Optional extras included navigation system, heated seats, and a wind deflector to reduce turbulence in the cabin when the top was down. The interior featured aluminum trim accents and S4-specific badging, reinforcing the car’s sporty character. Exterior styling cues included a unique front bumper with integrated fog lights, side skirts, a rear spoiler, and quad exhaust outlets.
Chassis & Braking
The S4 Cabriolet featured a fully independent suspension system, with a multi-link setup at the front and a trapezoidal-link arrangement at the rear. This configuration provided a comfortable ride while maintaining precise handling. The car was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) was standard. The steering was a rack-and-pinion system with hydraulic power assistance, offering responsive and accurate steering feel.
Market Reception & Comparison
The S4 Cabriolet (8E, B7) 4.2i was generally well-received by automotive critics. It was praised for its powerful engine, engaging driving dynamics, and luxurious interior. However, its relatively high fuel consumption and price were noted as potential drawbacks. Compared to the 1.8T and 3.0-liter V6 S4 variants, the 4.2i offered significantly more performance and a more refined driving experience. The 1.8T models were more fuel-efficient and affordable, while the 3.0 TDI offered strong torque and improved fuel economy but lacked the V8’s character. The 4.2i was aimed at buyers who prioritized performance and exclusivity.
Legacy
The BBK 4.2-liter V8 engine, while known for its performance, can require more frequent maintenance than some of the smaller displacement engines in the S4 lineup. Common issues include oil consumption and potential for timing chain wear. However, with proper maintenance, the engine is generally reliable. Today, the S4 Cabriolet (8E, B7) 4.2i is a sought-after vehicle among enthusiasts, appreciated for its combination of performance, luxury, and open-top driving enjoyment. Well-maintained examples command a premium in the used car market, and the car remains a compelling option for those seeking a high-performance convertible.
