Comparison BMW 6 Series Convertible (E64) 645 Ci (333 Hp) & BMW 4 Series Gran Coupe (F36, facelift 2017) 418d (150 Hp)
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| Brand: | BMW | BMW |
| Model: | 6 Series | 4 Series |
| Generation: | 6 Series Convertible (E64) | 4 Series Gran Coupe (F36, facelift 2017) |
| Engine / modification: | 645 Ci (333 Hp) | 418d (150 Hp) |
| Production start: | 2003 year | 2017 year |
| Production end: | 2005 year | |
| Coupe type: | Cabriolet | Coupe |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 2+2 | 5 |
| Fuel consumption / economy - urban: | 18.5 l/100 km | 5.0-5.4 l/100 km |
| Fuel consumption / economy - extra urban: | 9.6 l/100 km | 3.6-3.9 l/100 km |
| Fuel consumption / economy - combined: | 12.9 l/100 km | 4.1-4.5 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.32 | 0.27 |
| Fuel tank volume: | 70 l | 57 l |
| Emission standard: | Euro 4 | Euro 6 |
| CO2 emissions: | 109-118 g/km | |
| Power: | 333 hp | 150 hp |
| Max power in: | 6100 rpm. | 4000 rpm. |
| Maximum speed: | 250 km/h | 213 km/h |
| Acceleration from 0 to 100 km/h: | 6.1 sec | 9.0 sec |
| Torque: | 450 Nm @ 3600 rpm. | 320 Nm @ 1500-3000 rpm. |
| Model Engine: | N62B44 | B47D20 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4398 cm3 | 1995 cm3 |
| Engine oil capacity: | 8 l | 5.0 l |
| Coolant: | 14.2 l | |
| Fuel System: | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Twin-power turbo | |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | 16.5 |
| 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 | 4640 mm |
| Width: | 1855 mm | 1825 mm |
| Height: | 1373 mm | 1389 mm |
| Wheelbase: | 2780 mm | 2810 mm |
| Front track: | 1558 mm | 1557 mm |
| Rear (Back) track: | 1592 mm | 1604 mm |
| Ride height(clearance): | 130 mm | |
| Minimum volume of Luggage (trunk): | 300 l | 480 l |
| Maximum amount of Luggage (trunk): | 350 l | 1300 l |
| Front suspension: | Coil spring | Independent, spring |
| Rear suspension: | Helical spring | Multi-link independent |
| Max weight: | 2215 kg | 2070 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs |
| Kerb Weight: | 1815 kg | 1510 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Electric Steering |
| Max. roof load: | 75 kg | |
| Minimum turning circle (turning diameter): | 11.4 m | 11.3 m |
| Permitted trailer load with brakes (12%): | 1600 kg | |
| Permitted trailer load without brakes: | 745 kg | |
| Permitted towbar download: | 75 kg | |
| Tire size: | 245/45 R18 | 225/50 R17; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 |
| Wheel rims size: | 8J x 18 | 7.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 |