Comparison BMW Z4 (E85, facelift 2006) 3.0 si (265 Hp) & Audi RS 6 (4B,C5) 4.2 BiTurbo V8 (450 Hp) quattro Tiptronic
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| Brand: | BMW | Audi |
| Model: | Z4 | RS 6 |
| Generation: | Z4 (E85, facelift 2006) | RS 6 (4B,C5) |
| Engine / modification: | 3.0 si (265 Hp) | 4.2 BiTurbo V8 (450 Hp) quattro Tiptronic |
| Production start: | 2006 year | 2002 year |
| Production end: | 2008 year | 2006 year |
| Coupe type: | Cabriolet | Sedan |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 2 | 5 |
| Fuel consumption / economy - urban: | 13.0 l/100 km | 21.8 l/100 km |
| Fuel consumption / economy - extra urban: | 6.5 l/100 km | 10.4 l/100 km |
| Fuel consumption / economy - combined: | 8.9 l/100 km | 14.6 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.34 | |
| Fuel tank volume: | 55 l | 82 l |
| Emission standard: | Euro 3 | |
| CO2 emissions: | 350 g/km | |
| Power: | 265 hp | 450 hp |
| Max power in: | 6600 rpm. | 5700-6400 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 5.7 sec | 4.9 sec |
| Acceleration from 0 to 200 km/h: | 17.6 sec | |
| Torque: | 315 Nm @ 2500 rpm. | 560 Nm @ 1950-5500 rpm. |
| Model Engine: | N52B30 | BCY |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2996 cm3 | 4172 cm3 |
| Engine oil capacity: | 6.5 l | 7.5 l |
| Coolant: | 11 l | |
| Fuel System: | Multi-point injection | Multi-point injection |
| Aspiration / Turbine: | BiTurbo | |
| Position of cylinders: | Inline | V engine |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 5 |
| Compression ratio: | 10.7 | 11 |
| Piston Stroke: | 88 mm | 93 mm |
| Cylinder Bore: | 85 mm | 84.5 mm |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 5 Tiptronic | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4091 mm | 4858 mm |
| Width: | 1781 mm | 1850 mm |
| Height: | 1268 mm | 1387-1426 mm |
| Wheelbase: | 2495 mm | 2759 mm |
| Front track: | 1473 mm | 1578 mm |
| Rear (Back) track: | 1523 mm | 1587 mm |
| Minimum volume of Luggage (trunk): | 300 l | 424 l |
| Front suspension: | The depreciated rack | Independent multi-link |
| Rear suspension: | Helical spring | Double wishbone |
| Max weight: | 1650 kg | 2380 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1395 kg | 1840 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering |
| Max. roof load: | 100 kg | |
| Minimum turning circle (turning diameter): | 9.8 m | 11.4 m |
| Tire size: | 225/45 R17 | 255/40 R18 |
| Wheel rims size: | 8J x 17 | 8.5J x 18 |