Comparison BMW 8 Series Convertible (G14) 840i (340 Hp) xDrive Steptronic & BMW 4 Series Coupe (F32) 420i (184 Hp) Steptronic
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| Brand: | BMW | BMW |
| Model: | 8 Series | 4 Series |
| Generation: | 8 Series Convertible (G14) | 4 Series Coupe (F32) |
| Engine / modification: | 840i (340 Hp) xDrive Steptronic | 420i (184 Hp) Steptronic |
| Production start: | 2019 year | 2016 year |
| Production end: | 2020 year | 2016 year |
| Coupe type: | Cabriolet | Coupe |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 4 | 4 |
| Fuel consumption / economy - urban: | 9.7-9.8 l/100 km | 7.1-7.6 l/100 km |
| Fuel consumption / economy - extra urban: | 6.6-6.7 l/100 km | 4.5-4.7 l/100 km |
| Fuel consumption / economy - combined: | 7.7-7.8 l/100 km | 5.5-5.8 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | 0.29 |
| Fuel tank volume: | 68 l | 60 l |
| Emission standard: | Euro 6d - TEMP | EURO VI |
| CO2 emissions: | 175-178 g/km | 127-134 g/km |
| Power: | 340 hp | 184 hp |
| Max power in: | 5000-6500 rpm. | 5000 rpm. |
| Maximum speed: | 250 km/h | 236 km/h |
| Acceleration from 0 to 100 km/h: | 4.9 sec | 7.5 sec |
| Torque: | 500 Nm @ 1600-4500 rpm. | 270 Nm @ 1350-4600 rpm. |
| Model Engine: | B58B30 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2998 cm3 | 1998 cm3 |
| Engine oil capacity: | 6.5 l | 5.25 l |
| Fuel System: | Direct injection | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | Twin-power turbo |
| Position of cylinders: | Inline | Inline |
| Number of cylinders: | 6 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 11 | 11 |
| Piston Stroke: | 94.6 mm | 94.6 mm |
| Cylinder Bore: | 82 mm | 82 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 Steptronic | 8 Steptronic |
| Length: | 4843 mm | 4638 mm |
| Width: | 1902 mm | 1825 mm |
| Width including mirrors: | 2137 mm | |
| Height: | 1339 mm | 1377 mm |
| Wheelbase: | 2822 mm | 2810 mm |
| Front track: | 1627 mm | 1545 mm |
| Rear (Back) track: | 1642 mm | 1594 mm |
| Ride height(clearance): | 118 mm | 130 mm |
| Front overhang: | 953 mm | |
| Rear overhang: | 1076 mm | |
| Minimum volume of Luggage (trunk): | 280 l | 445 l |
| Maximum amount of Luggage (trunk): | 350 l | |
| Front suspension: | Double wishbone | Independent, spring |
| Rear suspension: | Multi-link independent | Multi-link independent |
| Max weight: | 2400 kg | 2015 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1880 kg | 1495 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 | |
| Permitted trailer load with brakes (8%): | 1305 kg | |
| Minimum turning circle (turning diameter): | 11.9 m | 11.3 m |
| Permitted trailer load with brakes (12%): | 1305 kg | 1500 kg |
| Permitted trailer load without brakes: | 695 kg | |
| Permitted towbar download: | 75 kg | |
| Tire size: | 245/45 R18 100Y XL; 275/40 R18 103Y XL | 225/50 R17 94W; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 |
| Wheel rims size: | 8J x 18; 9J x 18 | 7.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 |