Comparison Audi A8 (D2, 4D, facelift 1998) 2.5 TDI V6 (150 Hp) tiptronic & Audi S4 (8E,B7) 4.2i V8 (344 Hp) quattro Tiptronic
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| Brand: | Audi | Audi |
| Model: | A8 | S4 |
| Generation: | A8 (D2, 4D, facelift 1998) | S4 (8E,B7) |
| Engine / modification: | 2.5 TDI V6 (150 Hp) tiptronic | 4.2i V8 (344 Hp) quattro Tiptronic |
| Production start: | 1998 year | 2004 year |
| Production end: | 2000 year | 2008 year |
| Coupe type: | Sedan | Sedan |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 17.9 l/100 km | |
| Fuel consumption / economy - extra urban: | 9.1 l/100 km | |
| Fuel consumption / economy - combined: | 12.3 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.29 | 0.3 |
| Fuel tank volume: | 90 l | 63 l |
| Emission standard: | Euro 2 | Euro 4 |
| CO2 emissions: | 295 g/km | |
| Power: | 150 hp | 344 hp |
| Max power in: | 4000 rpm. | 7000 rpm. |
| Maximum speed: | 214 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 10.9 sec | 5.8 sec |
| Torque: | 310 Nm @ 1500-3200 rpm. | 410 Nm @ 3500 rpm. |
| Model Engine: | AKN | BBK |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 2496 cm3 | 4163 cm3 |
| Engine oil capacity: | 5.5 l | 9.0 l |
| Coolant: | 10 l | 12.0 l |
| Fuel System: | Multi-point injection | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 5 |
| Compression ratio: | 19.5 | 11 |
| Piston Stroke: | 86.4 mm | 92.8 mm |
| Cylinder Bore: | 78.3 mm | 84.5 mm |
| Wheel Drive: | Front wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 Tiptronic | |
| Length: | 5034 mm | 4586 mm |
| Width: | 1880 mm | 1781 mm |
| Width including mirrors: | 1973 mm | |
| Height: | 1438 mm | 1415 mm |
| Wheelbase: | 2880 mm | 2651 mm |
| Front track: | 1597 mm | 1516 mm |
| Rear (Back) track: | 1586 mm | 1512 mm |
| Front overhang: | 1018 mm | |
| Rear overhang: | 1136 mm | |
| Minimum volume of Luggage (trunk): | 525 l | 460 l |
| Maximum amount of Luggage (trunk): | 833 l | |
| Front suspension: | Independent multi-link | |
| Rear suspension: | Independent on trapezoidal lever | |
| Max weight: | 2260 kg | 2255 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1660 kg | 1705 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Max. roof load: | 100 kg | 75 kg |
| Permitted trailer load with brakes (8%): | 2100 kg | |
| Minimum turning circle (turning diameter): | 12.3 m | 11.5 m |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 95 kg | |
| Tire size: | 225/60 R16 | 235/40 R18 |
| Wheel rims size: | 7J x 16 | 8J x 18 |