Comparison BMW 4 Series Convertible (F33, facelift 2017) 420i (184 Hp) & BMW 3 Series Touring (F31) 335i (306 Hp) xDrive Steptronic & BMW 4 Series Convertible (F33, facelift 2017) 430i (252 Hp) Steptronic
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| Brand: | BMW | BMW | BMW |
| Model: | 4 Series | 3 Series | 4 Series |
| Generation: | 4 Series Convertible (F33, facelift 2017) | 3 Series Touring (F31) | 4 Series Convertible (F33, facelift 2017) |
| Engine / modification: | 420i (184 Hp) | 335i (306 Hp) xDrive Steptronic | 430i (252 Hp) Steptronic |
| Production start: | 2017 year | 2013 year | 2017 year |
| Production end: | 2020 year | 2015 year | 2020 year |
| Coupe type: | Cabriolet | Combi | Cabriolet |
| Num. of Doors: | 2 | 5 | 2 |
| Num. of seats: | 4 | 5 | 4 |
| Fuel consumption / economy - urban: | 8.0-8.6 l/100 km | 11.1 l/100 km | 7.5-7.9 l/100 km |
| Fuel consumption / economy - extra urban: | 5.1-5.5 l/100 km | 6.0 l/100 km | 5.0-5.3 l/100 km |
| Fuel consumption / economy - combined: | 6.2-6.6 l/100 km | 7.9 l/100 km | 5.9-6.3 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.30 | 0.33 | 0.30 |
| Fuel tank volume: | 60 l | 60 l | |
| Emission standard: | Euro 6 | Euro 5 | Euro 6 |
| CO2 emissions: | 145-153 g/km | 184 g/km | 138-146 g/km |
| Power: | 184 hp | 306 hp | 252 hp |
| Max power in: | 5000 rpm. | 5800-6000 rpm. | 5200 rpm. |
| Maximum speed: | 230 km/h | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 8.2 sec | 5.1 sec | 6.3 sec |
| Torque: | 290 Nm @ 1350-4600 rpm. | 400 Nm @ 1200-5000 rpm. | 350 Nm @ 1450-4800 rpm. |
| Model Engine: | B48B20 | N55B30 | B48B20 |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1998 cm3 | 2979 cm3 | 1998 cm3 |
| Engine oil capacity: | 5-5.25 l | 6.5 l | 5.25 l |
| Coolant: | 6.7-7.2 l | ||
| Fuel System: | Direct injection | Direct injection | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | Twin-power turbo | Twin-power turbo |
| Position of cylinders: | Inline | Inline | Inline |
| Number of cylinders: | 4 | 6 | 4 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 11 | 10.2 | 10.2 |
| Piston Stroke: | 94.6 mm | 89.6 mm | 94.6 mm |
| Cylinder Bore: | 82 mm | 84 mm | 82 mm |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 Steptronic | 8 Steptronic | |
| Number of Gears (manual transmission): | 6 | ||
| Length: | 4640 mm | 4624 mm | 4640 mm |
| Width: | 1825 mm | 1811 mm | 1825 mm |
| Height: | 1384 mm | 1434 mm | 1384 mm |
| Wheelbase: | 2810 mm | 2810 mm | 2810 mm |
| Front track: | 1544 mm | 1531 mm | 1544 mm |
| Rear (Back) track: | 1593 mm | 1570 mm | 1593 mm |
| Ride height(clearance): | 130 mm | 145 mm | 130 mm |
| Minimum volume of Luggage (trunk): | 370 l | 495 l | 370 l |
| Maximum amount of Luggage (trunk): | 1500 l | ||
| Front suspension: | Independent, spring | Independent, spring | Independent, spring |
| Rear suspension: | Multi-link independent | Multi-link independent | Multi-link independent |
| Max weight: | 2170 kg | 2205 kg | 2195 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1700 kg | 1655 kg | 1735 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering | Electric Steering |
| Max. roof load: | 75 kg | ||
| Minimum turning circle (turning diameter): | 11.3 m | 11.3 m | 11.3 m |
| Permitted trailer load with brakes (12%): | 1400 kg | 1800 kg | 1600 kg |
| Permitted trailer load without brakes: | 695 kg | 750 kg | 745 kg |
| Permitted towbar download: | 75 kg | 75 kg | 75 kg |
| Tire size: | 225/50 R17; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 | 225/50 R17 94W | 225/50 R17; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 |
| Wheel rims size: | 7.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 | 7.5J x 17 | 7.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 |