The Audi A8 (D3, 4E) facelift of 2005, specifically the 3.7 V8 (280 Hp) quattro Tiptronic variant, represented a significant mid-cycle refresh of Audi’s flagship luxury sedan. Produced from 2005 to May 2006, this model occupied a middle ground within the D3/4E A8 range, positioned between the entry-level 3.2-liter V6 and the high-performance 4.2-liter V8 models. The facelift brought revised styling, updated technology, and refinements to the existing powertrain options, aiming to maintain the A8’s competitive edge in the full-size luxury segment. This generation A8 was a key model for Audi, showcasing their advancements in aluminum space frame construction and sophisticated all-wheel-drive technology.
Technical Specifications
| Brand | Audi |
| Model | A8 |
| Generation | A8 (D3, 4E, facelift 2005) |
| Type (Engine) | 3.7 V8 (280 Hp) quattro Tiptronic |
| Start of production | 2005 |
| End of production | May, 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (combined) | 13 l/100 km (18.1 US mpg, 21.7 UK mpg, 7.7 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.3 sec |
| Acceleration 0 – 62 mph | 7.3 sec |
| Acceleration 0 – 60 mph | 6.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 6.3 kg/Hp, 158.2 Hp/tonne |
| Weight-to-torque ratio | 4.9 kg/Nm, 203.4 Nm/tonne |
| Power | 280 Hp @ 6000 rpm |
| Power per litre | 75.7 Hp/l |
| Torque | 360 Nm @ 3750 rpm (265.52 lb.-ft. @ 3750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | BFL |
| Engine displacement | 3697 cm3 (225.6 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 84.5 mm (3.33 in.) |
| Piston Stroke | 82.4 mm (3.24 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 5 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Coolant | 11.5 l (12.15 US qt | 10.12 UK qt) |
| Kerb Weight | 1770 kg (3902.18 lbs.) |
| Max. weight | 2370 kg (5224.96 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space – minimum | 500 l (17.66 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 5062 mm (199.29 in.) |
| Width | 1894 mm (74.57 in.) |
| Height | 1444 mm (56.85 in.) |
| Wheelbase | 2944 mm (115.91 in.) |
| Front track | 1629 mm (64.13 in.) |
| Rear (Back) track | 1615 mm (63.58 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle | 12.1 m (39.7 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 6 |
| Gearbox type | automatic transmission Tiptronic |
| 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 | 225/60 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the 2005 Audi A8 3.7 V8 quattro Tiptronic is the BFL engine, a 3.7-liter naturally aspirated V8. This engine, part of Audi’s modular engine family, featured an aluminum alloy block and cylinder heads, contributing to a relatively lightweight construction. It utilized a multi-port fuel injection system, delivering fuel directly into the intake ports, and a dual overhead camshaft (DOHC) valvetrain with five valves per cylinder (four intake, one exhaust). This configuration optimized breathing and contributed to a respectable power output for its displacement. The engine produced 280 horsepower at 6000 rpm and 360 Nm (265.52 lb-ft) of torque at 3750 rpm. Paired with this engine was a six-speed Tiptronic automatic transmission, offering both fully automatic operation and the ability for the driver to manually select gears. The Tiptronic transmission was known for its smooth shifts and responsiveness, though it wasn’t as sporty or quick-shifting as some dual-clutch transmissions available in competing models.
Driving Characteristics
The 3.7 V8 Tiptronic A8 offered a comfortable and refined driving experience. While not as overtly sporty as the 4.2 V8 models, the 3.7-liter engine provided ample power for everyday driving and highway cruising. Acceleration from 0-60 mph took approximately 6.9 seconds, making it reasonably quick for a full-size luxury sedan. The Tiptronic transmission, while smooth, did introduce a slight loss of power compared to a manual transmission. The quattro all-wheel-drive system provided excellent traction in all weather conditions, enhancing stability and confidence. The gear ratios were tuned for a balance of fuel efficiency and performance, with a focus on providing smooth, effortless cruising. Compared to the 3.2-liter V6, the 3.7 V8 offered a noticeable increase in power and refinement, while the 4.2 V8 provided a more aggressive and engaging driving experience.
Equipment & Trim Levels
The 2005 A8 3.7 V8 quattro Tiptronic came standard with a comprehensive list of luxury features. Interior appointments typically included leather upholstery, wood trim, and power-adjustable front seats with memory function. Standard technology included a multi-information display, automatic climate control, a premium sound system, and xenon headlights. Optional extras included a navigation system, rear seat entertainment, massaging seats, and a sunroof. The A8 prioritized a luxurious and comfortable cabin experience, with a focus on high-quality materials and advanced technology. Trim levels were relatively limited, with most options being added individually rather than through distinct packages.
Chassis & Braking
The A8’s chassis was a defining feature of the D3 generation, utilizing Audi’s advanced aluminum space frame construction. This lightweight yet rigid structure contributed to the car’s handling and overall refinement. The suspension consisted of an independent multi-link setup at the front and an independent trapezoidal lever setup at the rear, providing a comfortable ride and good handling characteristics. Braking duties were handled by ventilated discs at the front and solid discs at the rear, coupled with an Anti-lock Braking System (ABS). The steering was a hydraulic power-assisted rack and pinion system, offering precise and responsive control. The 3.7 V8 model typically featured slightly smaller brake rotors compared to the higher-performance 4.2 V8 models.
Market Reception & Comparison
The 2005 Audi A8 3.7 V8 quattro Tiptronic was generally well-received by automotive critics. It was praised for its comfortable ride, luxurious interior, and sophisticated technology. However, some critics noted that the 3.7-liter engine lacked the outright performance of its competitors, particularly the BMW 7 Series and Mercedes-Benz S-Class. Fuel economy was also considered average for its class, with combined consumption around 13 l/100 km (18.1 US mpg). Compared to the A8 3.2 V6, the 3.7 V8 offered a significant performance upgrade, while the A8 4.2 V8 provided a more engaging driving experience but at a higher price point.
Legacy
The BFL 3.7-liter V8 engine, while not as ubiquitous as some of Audi’s other powertrains, proved to be a relatively reliable unit. With proper maintenance, these engines can provide many years of service. The Tiptronic transmission, however, is known to require more attentive maintenance, and failures can be costly to repair. In the used car market, the 2005 A8 3.7 V8 quattro Tiptronic represents a relatively affordable entry point into the luxury sedan segment. Its combination of comfort, technology, and all-wheel-drive capability continues to appeal to buyers seeking a refined and capable grand tourer. The aluminum space frame construction, while innovative for its time, can be expensive to repair in the event of significant damage.
