Comparison BMW 6 Series (E63) 645 Ci (333 Hp) Automatic & BMW 3 Series Touring (E30) 320i (129 Hp)
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| Brand: | BMW | BMW |
| Model: | 6 Series | 3 Series |
| Generation: | 6 Series (E63) | 3 Series Touring (E30) |
| Engine / modification: | 645 Ci (333 Hp) Automatic | 320i (129 Hp) |
| Production start: | 2003 year | 1988 year |
| Production end: | 2005 year | 1991 year |
| Coupe type: | Coupe | Combi |
| Num. of Doors: | 2 | 5 |
| Num. of seats: | 2+2 | 5 |
| Fuel consumption / economy - urban: | 16.1 l/100 km | 13.0 l/100 km |
| Fuel consumption / economy - extra urban: | 8.0 l/100 km | 7.5 l/100 km |
| Fuel consumption / economy - combined: | 10.9 l/100 km | 9.5 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.29 | |
| Fuel tank volume: | 70 l | 62 l |
| Emission standard: | Euro 4 | |
| CO2 emissions: | 264 g/km | |
| Power: | 333 hp | 129 hp |
| Max power in: | 6100 rpm. | 6000 rpm. |
| Maximum speed: | 250 km/h | 196 km/h |
| Acceleration from 0 to 100 km/h: | 5.8 sec | 11.5 sec |
| Torque: | 450 Nm @ 3600 rpm. | 164 Nm @ 4300 rpm. |
| Model Engine: | N63B44 | M20B20 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4398 cm3 | 1991 cm3 |
| Engine oil capacity: | 8.0 l | 4.3 l |
| Coolant: | 14.2 l | |
| Fuel System: | Multi-point injection | Multi-point injection |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 10 | 8.8 |
| Piston Stroke: | 82.7 mm | 66 mm |
| Cylinder Bore: | 92 mm | 80 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 6 | |
| Number of Gears (manual transmission): | 5 | |
| Length: | 4820 mm | 4325 mm |
| Width: | 1855 mm | 1645 mm |
| Height: | 1373 mm | 1380 mm |
| Wheelbase: | 2780 mm | 2570 mm |
| Front track: | 1558 mm | 1405 mm |
| Rear (Back) track: | 1592 mm | 1415 mm |
| Minimum volume of Luggage (trunk): | 450 l | 370 l |
| Maximum amount of Luggage (trunk): | 1125 l | |
| Front suspension: | Coil spring | Coil spring |
| Rear suspension: | Helical spring | Helical spring |
| Max weight: | 2065 kg | 1710 kg |
| Front brakes: | Disc | Disc |
| Rear brakes: | Disc | Drum |
| Kerb Weight: | 1695 kg | 1230 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 11.4 m | |
| Tire size: | 245/45 R18 | 195/65 R14 |
| Wheel rims size: | 8J X 18 | R14 |