Comparison BMW 6 Series Convertible (F12) 650i (450 Hp) xDrive Steptronic & BMW 4 Series Coupe (G22) M440i (374 Hp) MHEV xDrive Steptronic
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| Brand: | BMW | BMW |
| Model: | 6 Series | 4 Series |
| Generation: | 6 Series Convertible (F12) | 4 Series Coupe (G22) |
| Engine / modification: | 650i (450 Hp) xDrive Steptronic | M440i (374 Hp) MHEV xDrive Steptronic |
| Production start: | 2012 year | 2020 year |
| Production end: | 2015 year | |
| Coupe type: | Cabriolet | Coupe |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 4 | 4 |
| Fuel consumption / economy - urban: | 13.0-13.3 l/100 km | 8.6-9.0 l/100 km |
| Fuel consumption / economy - extra urban: | 7.2-7.3 l/100 km | 5.7-6.0 l/100 km |
| Fuel consumption / economy - combined: | 9.3-9.5 l/100 km | 6.8-7.1 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | 0.28 |
| Fuel tank volume: | 70 l | 59 l |
| Combined fuel consumption (WLTP): | 7.4-8.1 l/100 km | |
| Emission standard: | Euro 5 | EURO 6d |
| CO2 emissions: | 217-221 g/km | 155-161 g/km |
| Power: | 450 hp | 374 hp |
| Max power in: | 5500 rpm. | 5500-6500 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 4.5 sec | 4.5 sec |
| CO2 emissions (WLTP): | 170-186 g/km | |
| Torque: | 650 Nm @ 2000-4500 rpm. | 500 Nm @ 1900-5000 rpm. |
| Model Engine: | N63B44 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4395 cm3 | 2998 cm3 |
| Engine oil capacity: | 9.5 l | 7.2 l |
| Coolant: | 14.4 l | |
| Fuel System: | Direct injection | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | Twin-power turbo |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | VALVETRONIC | |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | 10.2 |
| Piston Stroke: | 88.3 mm | 94.6 mm |
| Cylinder Bore: | 89 mm | 82 mm |
| Electric motor power: | 11 | |
| Battery capacity: | 0.528 kWh | |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 8 Steptronic | 8 Steptronic |
| Length: | 4894 mm | 4770 mm |
| Width: | 1894 mm | 1852 mm |
| Height: | 1365 mm | 1393 mm |
| Wheelbase: | 2855 mm | 2851 mm |
| Front track: | 1600 mm | 1575 mm |
| Rear (Back) track: | 1665 mm | 1611 mm |
| Ride height(clearance): | 123 mm | 129 mm |
| Minimum volume of Luggage (trunk): | 300 l | 440 l |
| Maximum amount of Luggage (trunk): | 350 l | |
| Front suspension: | Double wishbone | Double wishbone |
| Rear suspension: | Multi-link independent | Multi-link independent |
| Max weight: | 2480 kg | 2245 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1980 kg | 1740 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering |
| Max. roof load: | 75 kg | |
| Minimum turning circle (turning diameter): | 11.7 m | 12.0 m |
| Permitted trailer load with brakes (12%): | 1800 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 75 kg | |
| Tire size: | 225/55 R17; 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 | Front wheel tires: 225/45 R18 95Y XL |
| Wheel rims size: | 8J x 17; 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 | Front wheel rims: 7.5J x 18 |