Comparison BMW 4 Series Convertible (F33) 425d (218 Hp) & BMW 6 Series Gran Coupe (F06 LCI, facelift 2015) 640i (320 Hp) Steptronic
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| Brand: | BMW | BMW |
| Model: | 4 Series | 6 Series |
| Generation: | 4 Series Convertible (F33) | 6 Series Gran Coupe (F06 LCI, facelift 2015) |
| Engine / modification: | 425d (218 Hp) | 640i (320 Hp) Steptronic |
| Production start: | 2014 year | 2015 year |
| Production end: | 2016 year | 2018 year |
| Coupe type: | Cabriolet | Coupe |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 4 | 5 |
| Fuel consumption / economy - urban: | 6.5-6.6 l/100 km | 10.4-10.9 l/100 km |
| Fuel consumption / economy - extra urban: | 4.5-4.7 l/100 km | 5.8-6.0 l/100 km |
| Fuel consumption / economy - combined: | 5.2-5.4 l/100 km | 7.5-7.8 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.30 | 0.28 |
| Fuel tank volume: | 57 l | 70 l |
| Emission standard: | Euro 6 | EURO VI |
| CO2 emissions: | 138-142 g/km | 174-182 g/km |
| Power: | 218 hp | 320 hp |
| Max power in: | 4400 rpm. | 5800-6000 rpm. |
| Maximum speed: | 241 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 7.3 sec | 5.4 sec |
| Torque: | 450 Nm @ 1500-2500 rpm. | 450 Nm @ 1300-4500 rpm. |
| Model Engine: | N47D20 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1995 cm3 | 2979 cm3 |
| Engine oil capacity: | 5.2 l | 6.5 l |
| Coolant: | 7.0 l | 10.0 l |
| Fuel System: | Diesel Commonrail | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | Twin-power turbo |
| Position of cylinders: | Inline | Inline |
| Number of cylinders: | 4 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.5 | 10.2 |
| Piston Stroke: | 90 mm | 89.6 mm |
| Cylinder Bore: | 84 mm | 84 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 Steptronic | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4638 mm | 5007 mm |
| Width: | 1825 mm | 1894 mm |
| Height: | 1384 mm | 1392 mm |
| Wheelbase: | 2810 mm | 2968 mm |
| Front track: | 1545 mm | 1600 mm |
| Rear (Back) track: | 1594 mm | 1665 mm |
| Ride height(clearance): | 130 mm | 126 mm |
| Minimum volume of Luggage (trunk): | 370 l | 460 l |
| Maximum amount of Luggage (trunk): | 1265 l | |
| Front suspension: | Independent, spring | Double wishbone |
| Rear suspension: | Multi-link independent | Multi-link independent |
| Max weight: | 2165 kg | 2360 kg |
| Front brakes: | Ventilated discs | Disc |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1715 kg | 1750 kg |
| ABS: | yes | 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): | 11.3 m | 11.95 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 94W; 225/45 R18; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 | 225/55 R17; 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; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 | 8J x 17; 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 |