Comparison BMW 4 Series Convertible (F33) 420d (184 Hp) & BMW 8 Series (G15) 840i (333 Hp) xDrive Steptronic
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| Brand: | BMW | BMW |
| Model: | 4 Series | 8 Series |
| Generation: | 4 Series Convertible (F33) | 8 Series (G15) |
| Engine / modification: | 420d (184 Hp) | 840i (333 Hp) xDrive Steptronic |
| Production start: | 2014 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: | 6.0 l/100 km | |
| Fuel consumption / economy - extra urban: | 4.5 l/100 km | |
| Fuel consumption / economy - combined: | 5.1 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.28 | 0.30 |
| Fuel tank volume: | 57 l | 68 l |
| Emission standard: | Euro 6 | Euro 6d |
| CO2 emissions: | 133 g/km | |
| Power: | 184 hp | 333 hp |
| Max power in: | 4000 rpm. | 5500-6250 rpm. |
| Maximum speed: | 235 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 8.2 sec | 4.9 sec |
| Torque: | 380 Nm @ 1750-2750 rpm. | 500 Nm @ 1700-4000 rpm. |
| Model Engine: | N47D20 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1995 cm3 | 2998 cm3 |
| Engine oil capacity: | 5.2 l | 6.5 l |
| Coolant: | 7.0 l | |
| Fuel System: | Diesel Commonrail | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | |
| Position of cylinders: | Inline | Inline |
| Valvetrain: | VALVETRONIC | |
| Number of cylinders: | 4 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.5 | 11 |
| Piston Stroke: | 90 mm | 94.6 mm |
| Cylinder Bore: | 84 mm | 82 mm |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 8 Steptronic | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4638 mm | 4843 mm |
| Width: | 1825 mm | 1902 mm |
| Height: | 1384 mm | 1341 mm |
| Wheelbase: | 2810 mm | 2822 mm |
| Front track: | 1545 mm | 1627 mm |
| Rear (Back) track: | 1594 mm | 1642 mm |
| Ride height(clearance): | 130 mm | 121 mm |
| Minimum volume of Luggage (trunk): | 220 l | 420 l |
| Maximum amount of Luggage (trunk): | 370 l | |
| Front suspension: | Independent, spring | Double wishbone |
| Rear suspension: | Multi-link independent | Multi-link independent |
| Max weight: | 2150 kg | 2280 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1680 kg | 1795 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | |
| Power steering: | Electric Steering | Electric Steering |
| Max. roof load: | 75 kg | |
| Minimum turning circle (turning diameter): | 11.3 m | 11.9 m |
| Permitted trailer load with brakes (12%): | 1600 kg | |
| Permitted trailer load without brakes: | 745 kg | |
| Permitted towbar download: | 75 kg | |
| Tire size: | 225/50 R17 94W | Front wheel tires: 245/45 R18 100Y XL |
| Wheel rims size: | 7.5J x 17 | Front wheel rims: 8J x 18 |