The Audi S4 Avant (4A, C4) 2.2i 20V Turbo quattro, produced between August 1991 and July 1994, represents a pivotal moment in the evolution of high-performance station wagons. Positioned as the performance variant of the Audi 80/90 series, the S4 Avant combined practicality with exhilarating performance, largely thanks to its turbocharged five-cylinder engine and standard quattro all-wheel drive. This model was a key component of Audi’s strategy to establish itself as a premium brand capable of delivering both luxury and sporting dynamics, primarily targeting the European market where the wagon body style was – and remains – highly popular. It was built on the Audi B3 platform, internally designated 4A/C4.
Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 Avant (4A,C4) |
| Type (Engine) | 2.2i 20V Turbo (230 Hp) quattro |
| Start of production | August, 1991 |
| End of production | July, 1994 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 235 km/h (146.02 mph) |
| Weight-to-power ratio | 7.2 kg/Hp, 138.6 Hp/tonne |
| Weight-to-torque ratio | 4.7 kg/Nm, 210.8 Nm/tonne |
| Power | 230 Hp @ 5900 rpm |
| Power per litre | 103.3 Hp/l |
| Torque | 350 Nm @ 1950 rpm (258.15 lb.-ft. @ 1950 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | AAN |
| Engine displacement | 2226 cm3 (135.84 cu. in.) |
| Number of cylinders | 5 |
| Engine configuration | Inline |
| Cylinder Bore | 81 mm (3.19 in.) |
| Piston Stroke | 86.4 mm (3.4 in.) |
| Compression ratio | 9.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger |
| Engine oil capacity | 4.5 l (4.76 US qt | 3.96 UK qt) |
| Coolant | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1660 kg (3659.67 lbs.) |
| Max. weight | 2210 kg (4872.22 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 390 l (13.77 cu. ft.) |
| Trunk (boot) space – maximum | 1310 l (46.26 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 4790 mm (188.58 in.) |
| Width | 1804 mm (71.02 in.) |
| Height | 1454 mm (57.24 in.) |
| Wheelbase | 2692 mm (105.98 in.) |
| Front track | 1562 mm (61.5 in.) |
| Rear (Back) track | 1531 mm (60.28 in.) |
| Drag coefficient (Cd) | 0.34 |
| Minimum turning circle | 11.4 m (37.4 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 6 gears, manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 215/60 R15 |
| Wheel rims size | 15 |
Powertrain & Engine Architecture
The heart of the S4 Avant was the Audi AAN engine, a 2.2-liter inline-five cylinder powerplant. This engine was a significant departure from the four-cylinder engines typically found in the Audi 80 range. The AAN featured a cast iron block, aluminum cylinder head, and a sophisticated turbocharging system. The turbocharger, a KKK K24 unit, provided substantial boost, contributing to the engine’s high specific output. Fuel delivery was managed by Bosch Motronic 3.1 multi-port fuel injection, carefully calibrated to balance performance and efficiency. The 20-valve cylinder head, with its four valves per cylinder, maximized airflow and contributed to the engine’s responsive nature. The engine’s robust construction and well-engineered design allowed it to be readily tuned for even greater power output, making it a favorite among enthusiasts.
Driving Characteristics
The 230 horsepower and 258 lb-ft of torque delivered by the AAN engine, coupled with the quattro all-wheel-drive system, resulted in a driving experience that was both engaging and secure. Acceleration to 60 mph was achieved in approximately 6.7 seconds, and top speed was limited to 146 mph. The six-speed manual transmission offered precise shifts and allowed the driver to fully exploit the engine’s powerband. Compared to the standard Audi 80 models, the S4 Avant offered a noticeably more responsive throttle and significantly stronger acceleration. While not as brutally fast as some contemporary sports cars, the S4 Avant provided a refined and capable driving experience, particularly in adverse weather conditions where the quattro system provided exceptional traction. The all-wheel drive system distributed power between the front and rear axles as needed, enhancing stability and cornering grip.
Equipment & Trim Levels
The S4 Avant was well-equipped, reflecting its position as a premium performance model. Standard features included sport seats upholstered in patterned fabric, a leather-wrapped steering wheel and gearshift knob, power windows and locks, and an upgraded audio system. Optional extras included leather upholstery, sunroof, automatic climate control, and a more advanced audio system with a CD changer. The interior design was functional and understated, with a focus on ergonomics and driver comfort. The exterior was distinguished by subtle styling cues, including a unique front grille, body-colored side skirts, and a rear spoiler.
Chassis & Braking
The S4 Avant featured a fully independent suspension system, with MacPherson struts at the front and semi-trailing arms at the rear. The suspension was tuned to provide a balance between comfort and handling, offering a firm but not overly harsh ride. Braking duties were handled by ventilated disc brakes at all four corners, providing ample stopping power. The braking system was not particularly advanced by modern standards, but it was effective for the car’s weight and performance. The chassis was reinforced compared to the standard Audi 80 Avant, enhancing rigidity and improving handling precision.
Market Reception & Comparison
The Audi S4 Avant was generally well-received by automotive critics, who praised its performance, handling, and practicality. It was often compared to other high-performance station wagons of the era, such as the BMW M5 Touring and the Mercedes-Benz 500E. While the BMW and Mercedes offered more outright power, the S4 Avant provided a compelling combination of performance, value, and all-weather capability. Fuel economy was reasonable for a performance car of this era, averaging around 20-25 mpg in mixed driving. Reliability was generally good, although the turbocharger and associated components required regular maintenance.
Legacy
The Audi S4 Avant (4A, C4) remains a sought-after classic among Audi enthusiasts. The AAN engine is renowned for its durability and tunability, and well-maintained examples continue to provide years of reliable service. The car’s combination of performance, practicality, and understated styling has ensured its enduring appeal. In the used car market, prices for well-preserved S4 Avants have been steadily increasing, reflecting their rarity and desirability. The S4 Avant laid the groundwork for Audi’s future success in the high-performance wagon segment, paving the way for models like the RS4 Avant and RS6 Avant.
