Comparison Audi A8 (D3, 4E, facelift 2007) 4.2 BiTDI V8 (326 Hp) quattro DPF Tiptronic & Audi A4 (B5, Typ 8D) 2.4 V6 30V (165 Hp) quattro Tiptronic
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| Brand: | Audi | Audi |
| Model: | A8 | A4 |
| Generation: | A8 (D3, 4E, facelift 2007) | A4 (B5, Typ 8D) |
| Engine / modification: | 4.2 BiTDI V8 (326 Hp) quattro DPF Tiptronic | 2.4 V6 30V (165 Hp) quattro Tiptronic |
| Production start: | 2007 year | 1997 year |
| Production end: | 2009 year | 1999 year |
| Coupe type: | Sedan | Sedan |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 13.3 l/100 km | |
| Fuel consumption / economy - extra urban: | 7.2 l/100 km | |
| Fuel consumption / economy - combined: | 9.4 l/100 km | 11.3 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.27 | 0.31 |
| Fuel tank volume: | 90 l | 60 l |
| Emission standard: | Euro 4 | |
| CO2 emissions: | 249 g/km | |
| Power: | 326 hp | 165 hp |
| Max power in: | 3750 rpm. | 6000 rpm. |
| Maximum speed: | 250 km/h | 216 km/h |
| Acceleration from 0 to 100 km/h: | 5.9 sec | 9.9 sec |
| Torque: | 650 Nm @ 1600-3500 rpm. | 230 Nm @ 3200 rpm. |
| Model Engine: | BVN | AGA, ALF, AML, APS, ARJ |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4134 cm3 | 2393 cm3 |
| Engine oil capacity: | 10.0 l | 6.0 l |
| Coolant: | 14.9 l | |
| Fuel System: | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | BiTurbo | |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 5 |
| Compression ratio: | 16.5 | 10.5 |
| Piston Stroke: | 95.5 mm | 77.4 mm |
| Cylinder Bore: | 83 mm | 81 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 Tiptronic | 5 Tiptronic |
| Length: | 5062 mm | 4479 mm |
| Width: | 1894 mm | 1733 mm |
| Height: | 1444 mm | 1415 mm |
| Wheelbase: | 2944 mm | 2607 mm |
| Front track: | 1629 mm | 1498 mm |
| Rear (Back) track: | 1615 mm | 1477 mm |
| Minimum volume of Luggage (trunk): | 500 l | 440 l |
| Front suspension: | Multi-link suspension | Wishbone |
| Rear suspension: | Independent on trapezoidal lever | Double wishbone |
| Max weight: | 2545 kg | 1980 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1945 kg | 1430 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Max. roof load: | 100 kg | |
| Permitted trailer load with brakes (8%): | 2300 kg | |
| Minimum turning circle (turning diameter): | 12.1 m | 11.1 m |
| Permitted trailer load with brakes (12%): | 2300 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 95 kg | |
| Tire size: | 235/55 R17 | 195/65 R15 |
| Wheel rims size: | 8J x 17 | R15 |