The Audi S5 Coupe (8T) 4.2 FSI V8 quattro, produced from February 2007 to 2011, represents the high-performance variant of the B8 generation Audi A5 Coupe. Positioned above the standard A5 and other lower-trim S5 models, it served as a direct competitor to the BMW 3 Series Coupe and Mercedes-Benz CLK-Class, offering a blend of luxury, performance, and all-weather capability through Audi’s renowned quattro all-wheel-drive system. This particular configuration, featuring the naturally aspirated 4.2-liter V8 engine paired with a six-speed manual transmission, was the flagship offering for the S5 Coupe during its production run, embodying Audi’s commitment to driving dynamics and sophisticated engineering.
Technical Specifications
| Brand | Audi |
| Model | S5 |
| Generation | S5 Coupe (8T) |
| Type (Engine) | 4.2 FSI V8 (354 Hp) quattro |
| Start of production | February, 2007 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 18.1 l/100 km (13 US mpg, 15.6 UK mpg, 5.5 km/l) |
| Fuel consumption (extra urban) | 8.7 l/100 km (27 US mpg, 32.5 UK mpg, 11.5 km/l) |
| Fuel consumption (combined) | 12.1 l/100 km (19.4 US mpg, 23.3 UK mpg, 8.3 km/l) |
| CO2 emissions | 288 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.1 sec |
| Acceleration 0 – 62 mph | 5.1 sec |
| Acceleration 0 – 60 mph | 4.8 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 4.6 kg/Hp, 215.9 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 268.3 Nm/tonne |
| Power | 354 Hp @ 7000 rpm |
| Power per litre | 85 Hp/l |
| Torque | 440 Nm @ 3500 rpm (324.53 lb.-ft. @ 3500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | CAUA |
| 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 | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 8.8 l (9.3 US qt | 7.74 UK qt) |
| Coolant | 9.7 l (10.25 US qt | 8.53 UK qt) |
| Kerb Weight | 1640 kg (3615.58 lbs.) |
| Max. weight | 2140 kg (4717.89 lbs.) |
| Max load | 500 kg (1102.31 lbs.) |
| Trunk (boot) space – minimum | 455 l (16.07 cu. ft.) |
| Fuel tank capacity | 64 l (16.91 US gal | 14.08 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (8%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load with brakes (12%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4625 mm (182.09 in.) |
| Width | 1854 mm (72.99 in.) |
| Width including mirrors | 1981 mm (77.99 in.) |
| Height | 1369 mm (53.9 in.) |
| Wheelbase | 2751 mm (108.31 in.) |
| Front track | 1594 mm (62.76 in.) |
| Rear (Back) track | 1581 mm (62.24 in.) |
| Front overhang | 850 mm (33.46 in.) |
| Rear overhang | 1024 mm (40.31 in.) |
| Drag coefficient (Cd) | 0.306 |
| Minimum turning circle (turning diameter) | 11.4 m (37.4 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent on trapezoidal lever |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 245/40 R18 |
| Wheel rims size | 8.5J x 18 |
Powertrain & Engine Architecture
The heart of the S5 Coupe 4.2 FSI quattro is the CAUA engine, a 4.2-liter naturally aspirated V8. This engine utilizes Audi’s FSI (Fuel Stratified Injection) direct injection technology, delivering fuel directly into the combustion chamber for improved efficiency and power. The engine boasts a 11:1 compression ratio and a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The engine’s architecture is longitudinal, meaning it’s mounted lengthwise in the engine bay, and is paired exclusively with Audi’s quattro all-wheel-drive system. The six-speed manual transmission provides precise gear changes and enhances driver engagement. The quattro system employs a Torsen center differential, distributing torque between the front and rear axles as needed, providing excellent traction in various conditions.
Driving Characteristics
The 4.2-liter V8 delivers a robust 354 horsepower and 324.53 lb-ft of torque, resulting in a 0-60 mph time of around 4.8 seconds. The manual transmission allows for full control over the engine’s power, while the quattro system ensures optimal grip. Compared to the 2.0 TFSI models, the V8 S5 offers significantly more power and a more refined driving experience. While the 2.0 TFSI prioritized fuel economy, the V8 focused on performance. The gear ratios in the six-speed manual are well-matched to the engine’s powerband, providing strong acceleration in all gears. The exhaust note is characteristically V8, providing an aural experience that enhances the driving pleasure.
Equipment & Trim Levels
The S5 Coupe 4.2 FSI quattro came standard with a comprehensive list of features, including leather upholstery, three-zone automatic climate control, a premium sound system, and bi-xenon headlights. Optional extras included a navigation system, advanced parking assist, and a panoramic sunroof. The interior featured S-specific badging and sport seats, differentiating it from the standard A5. Exterior styling cues included unique front and rear bumpers, side skirts, and quad exhaust outlets.
Chassis & Braking
The S5 Coupe featured a sport-tuned suspension, lowering the ride height and improving handling. The front suspension utilized independent multi-link technology, while the rear suspension employed an independent trapezoidal lever setup. Braking duties were handled by ventilated discs at all four corners, providing ample stopping power. The ABS (Anti-lock braking system) ensured stability during hard braking maneuvers. The steering system was a rack and pinion setup with hydraulic power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The S5 Coupe 4.2 FSI quattro was generally well-received by automotive critics, who praised its performance, handling, and luxurious interior. However, its fuel economy was often cited as a drawback, especially compared to the more fuel-efficient 2.0 TFSI models. The V8 S5 commanded a significant price premium over the four-cylinder variants, reflecting its higher performance and more exclusive features. Reliability was generally good, although preventative maintenance, particularly regarding the timing chain, was recommended.
Legacy
The Audi S5 Coupe 4.2 FSI quattro remains a desirable vehicle in the used car market today, particularly among enthusiasts who appreciate its naturally aspirated V8 engine and engaging driving dynamics. The CAUA engine, while known for its performance, requires regular maintenance to prevent potential issues with the timing chain tensioners. Despite its age, the S5 Coupe continues to offer a compelling blend of luxury, performance, and all-weather capability, making it a popular choice for those seeking a sophisticated and rewarding driving experience.
