Comparison BMW 6 Series Convertible (E64) 645 Ci (333 Hp) Automatic & BMW 1 Series Hatchback 3dr (E81) 123d (204 Hp)
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| Brand: | BMW | BMW |
| Model: | 6 Series | 1 Series |
| Generation: | 6 Series Convertible (E64) | 1 Series Hatchback 3dr (E81) |
| Engine / modification: | 645 Ci (333 Hp) Automatic | 123d (204 Hp) |
| Production start: | 2003 year | 2007 year |
| Production end: | 2005 year | 2011 year |
| Coupe type: | Cabriolet | Hatchback |
| Num. of Doors: | 2 | 3 |
| Num. of seats: | 2+2 | 4 |
| Fuel consumption / economy - urban: | 16.8 l/100 km | 6.5 l/100 km |
| Fuel consumption / economy - extra urban: | 8.5 l/100 km | 4.4 l/100 km |
| Fuel consumption / economy - combined: | 11.5 l/100 km | 5.2 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.31 | 0.31 |
| Fuel tank volume: | 70 l | 51 l |
| Emission standard: | Euro 4 | Euro 5 |
| CO2 emissions: | 138 g/km | |
| Power: | 333 hp | 204 hp |
| Max power in: | 6100 rpm. | 4400 rpm. |
| Maximum speed: | 250 km/h | 238 km/h |
| Acceleration from 0 to 100 km/h: | 6.2 sec | 6.9 sec |
| Torque: | 450 Nm @ 3600 rpm. | 400 Nm @ 2000-2250 rpm. |
| Model Engine: | N62B44 | N47D20 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4398 cm3 | 1995 cm3 |
| Engine oil capacity: | 8 l | 5.2 l |
| Coolant: | 14.2 l | 7.2 l |
| Fuel System: | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Turbocharger | |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | - |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | 16 |
| Piston Stroke: | 82.7 mm | 90 mm |
| Cylinder Bore: | 92 mm | 84 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 6 | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4820 mm | 4239 mm |
| Width: | 1855 mm | 1748 mm |
| Height: | 1373 mm | 1421 mm |
| Wheelbase: | 2780 mm | 2660 mm |
| Front track: | 1558 mm | 1474 mm |
| Rear (Back) track: | 1592 mm | 1487 mm |
| Ride height(clearance): | 145 mm | |
| Minimum volume of Luggage (trunk): | 300 l | 330 l |
| Maximum amount of Luggage (trunk): | 350 l | 1150 l |
| Front suspension: | Coil spring | Double wishbone |
| Rear suspension: | Helical spring | Multi-link independent |
| Max weight: | 2220 kg | 1910 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs |
| Kerb Weight: | 1820 kg | 1410 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Max. roof load: | 75 kg | |
| Minimum turning circle (turning diameter): | 11.4 m | 10.7 m |
| Permitted trailer load with brakes (12%): | 1200 kg | |
| Permitted trailer load without brakes: | 740 kg | |
| Permitted towbar download: | 75 kg | |
| Tire size: | 245/45 R18 | 205/50 R17 89 W |
| Wheel rims size: | 8J x 18 | 7J x 17 |