Comparison BMW 4 Series Convertible (F33, facelift 2017) 440i (326 Hp) xDrive Steptronic & BMW 6 Series Convertible (F12 LCI, facelift 2015) 650i (450 Hp) Steptronic
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| Brand: | BMW | BMW |
| Model: | 4 Series | 6 Series |
| Generation: | 4 Series Convertible (F33, facelift 2017) | 6 Series Convertible (F12 LCI, facelift 2015) |
| Engine / modification: | 440i (326 Hp) xDrive Steptronic | 650i (450 Hp) Steptronic |
| Production start: | 2017 year | 2015 year |
| Production end: | 2020 year | 2018 year |
| Coupe type: | Cabriolet | Cabriolet |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 4 | 4 |
| Fuel consumption / economy - urban: | 9.8-10.3 l/100 km | 12.4-12.7 l/100 km |
| Fuel consumption / economy - extra urban: | 5.8-6.1 l/100 km | 6.9-7.0 l/100 km |
| Fuel consumption / economy - combined: | 7.3-7.6 l/100 km | 8.9-9.1 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | 0.32 |
| Fuel tank volume: | 60 l | 70 l |
| Emission standard: | Euro 6 | EURO VI |
| CO2 emissions: | 169-177 g/km | 208-213 g/km |
| Power: | 326 hp | 450 hp |
| Max power in: | 5500 rpm. | 5500-6000 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 5.4 sec | 4.6 sec |
| Torque: | 450 Nm @ 1380-5000 rpm. | 650 Nm @ 2000-4500 rpm. |
| Model Engine: | B58B30 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2998 cm3 | 4395 cm3 |
| Engine oil capacity: | 6.5 l | 9.0 l |
| Coolant: | 14.4 l | |
| Fuel System: | Direct injection | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | Twin-power turbo |
| Position of cylinders: | Inline | V engine |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 11 | 10 |
| Piston Stroke: | 94.6 mm | 88.3 mm |
| Cylinder Bore: | 82 mm | 89 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 Steptronic | 8 Steptronic |
| Length: | 4640 mm | 4894 mm |
| Width: | 1825 mm | 1894 mm |
| Height: | 1399 mm | 1365 mm |
| Wheelbase: | 2810 mm | 2855 mm |
| Front track: | 1543 mm | 1600 mm |
| Rear (Back) track: | 1593 mm | 1665 mm |
| Ride height(clearance): | 145 mm | 123 mm |
| Minimum volume of Luggage (trunk): | 370 l | 300 l |
| Maximum amount of Luggage (trunk): | 350 l | |
| Front suspension: | Independent, spring | Double wishbone |
| Rear suspension: | Multi-link independent | Multi-link independent |
| Max weight: | 2300 kg | 2425 kg |
| Front brakes: | Ventilated discs | Disc |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1850 kg | 1930 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 11.8 m | 11.7 m |
| Permitted trailer load with brakes (12%): | 1800 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 75 kg | |
| Tire size: | 225/50 R17; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 | 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 |
| Wheel rims size: | 7.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 | 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 |