Comparison BMW 6 Series Convertible (E64) 645 Ci (333 Hp) & BMW 3 Series Touring (E91) 325d (197 Hp)
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| Brand: | BMW | BMW |
| Model: | 6 Series | 3 Series |
| Generation: | 6 Series Convertible (E64) | 3 Series Touring (E91) |
| Engine / modification: | 645 Ci (333 Hp) | 325d (197 Hp) |
| Production start: | 2003 year | 2006 year |
| Production end: | 2005 year | 2008 year |
| Coupe type: | Cabriolet | Combi |
| Num. of Doors: | 2 | 5 |
| Num. of seats: | 2+2 | 5 |
| Fuel consumption / economy - urban: | 18.5 l/100 km | 8.8 l/100 km |
| Fuel consumption / economy - extra urban: | 9.6 l/100 km | 5.3 l/100 km |
| Fuel consumption / economy - combined: | 12.9 l/100 km | 6.6 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 70 l | |
| Emission standard: | Euro 4 | |
| Power: | 333 hp | 197 hp |
| Max power in: | 6100 rpm. | 3750 rpm. |
| Maximum speed: | 250 km/h | 233 km/h |
| Acceleration from 0 to 100 km/h: | 6.1 sec | 7.6 sec |
| Torque: | 450 Nm @ 3600 rpm. | 400 Nm @ 1300-3250 rpm. |
| Model Engine: | N62B44 | M57D30TU2 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4398 cm3 | 2993 cm3 |
| Engine oil capacity: | 8 l | 7.5 l |
| Coolant: | 14.2 l | 7.9 l |
| Fuel System: | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Turbocharger / Intercooler | |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | 17 |
| Piston Stroke: | 82.7 mm | 90 mm |
| Cylinder Bore: | 92 mm | 84 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (manual transmission): | 6 | 6 |
| Length: | 4820 mm | 4520 mm |
| Width: | 1855 mm | 1820 mm |
| Height: | 1373 mm | 1440 mm |
| Wheelbase: | 2780 mm | 2760 mm |
| Front track: | 1558 mm | 1500 mm |
| Rear (Back) track: | 1592 mm | 1510 mm |
| Minimum volume of Luggage (trunk): | 300 l | |
| Maximum amount of Luggage (trunk): | 350 l | |
| Front suspension: | Coil spring | Independent type McPherson |
| Rear suspension: | Helical spring | Multi-link independent |
| Max weight: | 2215 kg | 2130 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 1815 kg | 1565 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 11.4 m | |
| Tire size: | 245/45 R18 | 245/45 R17 |
| Wheel rims size: | 8J x 18 | R17 |