The BMW 4 Series Convertible (F33), specifically the 430i xDrive Steptronic facelift model produced from 2017 to 2020, represents a compelling blend of performance, luxury, and open-air driving enjoyment. Positioned as a mid-range offering within the 4 Series Convertible lineup, it slotted above the 420i and below the more potent 440i. This variant aimed to provide a balanced experience, appealing to drivers seeking a refined and capable convertible without the higher price tag or overtly sporty character of its more powerful sibling. The F33 generation, a successor to the E93, continued BMW’s tradition of premium compact convertibles, offering a sophisticated alternative to rivals like the Audi A5 Cabriolet and Mercedes-Benz C-Class Cabriolet.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Convertible (F33, facelift 2017) |
| Type (Engine) | 430i (252 Hp) xDrive Steptronic |
| Start of production | 2017 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 8.1-8.5 l/100 km (29 – 27.7 US mpg) |
| Fuel consumption (extra urban) | 5.4-5.7 l/100 km (43.6 – 41.3 US mpg) |
| Fuel consumption (combined) | 6.4-6.7 l/100 km (36.8 – 35.1 US mpg) |
| CO2 emissions | 149-156 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.4 sec |
| Acceleration 0 – 62 mph | 6.4 sec |
| Acceleration 0 – 60 mph | 6.1 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7.2 kg/Hp, 139.6 Hp/tonne |
| Weight-to-torque ratio | 5.2 kg/Nm, 193.9 Nm/tonne |
| Power | 252 Hp @ 5200 rpm |
| Torque | 350 Nm @ 1450-4800 rpm (258.15 lb.-ft. @ 1450-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B48B20B |
| Engine displacement | 1998 cm3 (121.93 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Coolant | 8.1 l (8.56 US qt | 7.13 UK qt) |
| Kerb Weight | 1805 kg (3979.34 lbs.) |
| Max. weight | 2255 kg (4971.42 lbs.) |
| Max load | 450 kg (992.08 lbs.) |
| Trunk (boot) space – minimum | 370 l (13.07 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Permitted trailer load with brakes (12%) | 1700 kg (3747.86 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4640 mm (182.68 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1399 mm (55.08 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1543 mm (60.75 in.) |
| Rear (Back) track | 1593 mm (62.72 in.) |
| Ride height (ground clearance) | 145 mm (5.71 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle (turning diameter) | 11.8 m (38.71 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Independent coil spring |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 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 |
Powertrain & Engine Architecture
At the heart of the 430i xDrive Steptronic lies BMW’s B48B20B 2.0-liter turbocharged inline-four cylinder engine. This engine is a member of BMW’s modular engine family, known for its efficiency and performance. The B48 utilizes direct fuel injection, operating at a compression ratio of 10.2:1, and is equipped with a twin-scroll turbocharger and intercooler to maximize power output and minimize turbo lag. The engine produces 252 horsepower at 5200 rpm and 350 Nm (258 lb-ft) of torque between 1450 and 4800 rpm. This broad torque curve contributes to responsive acceleration in everyday driving situations. The engine is paired with BMW’s 8-speed Steptronic automatic transmission, which offers smooth and quick shifts. The ‘xDrive’ designation indicates BMW’s intelligent all-wheel-drive system, which provides enhanced traction and stability, particularly in adverse weather conditions. The system typically operates in a rear-wheel-drive bias, seamlessly engaging the front wheels when needed.
Driving Characteristics
The 430i xDrive Steptronic delivers a refined and comfortable driving experience. While not as overtly sporty as the 440i, the 2.0-liter engine provides ample power for both city driving and highway cruising. The 8-speed automatic transmission is well-tuned, offering smooth gear changes and contributing to good fuel economy. The xDrive all-wheel-drive system enhances grip and stability, making the car feel confident and secure in various conditions. Compared to the manual transmission versions of the 430i, the Steptronic automatic offers a more relaxed driving experience, particularly in stop-and-go traffic. However, some enthusiasts may prefer the greater driver engagement offered by the manual gearbox. The gear ratios are optimized for a balance of acceleration and fuel efficiency, with the lower gears providing brisk acceleration and the higher gears allowing for comfortable cruising at highway speeds.
Equipment & Trim Levels
The 430i xDrive Steptronic came standard with a comprehensive list of features, including leather upholstery, power-adjustable seats, a premium sound system, and BMW’s iDrive infotainment system with a central display screen. Standard safety features included automatic emergency braking, lane departure warning, and a rearview camera. Optional extras included features such as a head-up display, navigation system, adaptive cruise control, and a Harman Kardon surround sound system. Interior trim options allowed for personalization, with choices ranging from wood veneers to aluminum accents. The convertible top was a fully automatic, retractable hardtop, providing a secure and insulated cabin when closed.
Chassis & Braking
The F33 4 Series Convertible features a sophisticated chassis design, incorporating an independent coil spring suspension at the front and an independent multi-link suspension at the rear. This setup provides a good balance of ride comfort and handling precision. The steering is precise and well-weighted, offering good feedback to the driver. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and stability control systems further enhance safety and control. The suspension tuning was generally softer than that of the coupe version to accommodate the added weight and reduced structural rigidity of the convertible body style.
Market Reception & Comparison
The 430i xDrive Steptronic was generally well-received by automotive critics, who praised its blend of performance, luxury, and refinement. It was considered a strong contender in the premium compact convertible segment. Compared to the 420i, the 430i offered a noticeable increase in power and performance. Compared to the 440i, it provided a more affordable entry point into the 4 Series Convertible range, albeit with slightly less power and a less sporty character. Fuel economy was considered competitive for its class, and reliability was generally good, although some owners reported minor issues with the infotainment system.
Legacy
The BMW 430i xDrive Steptronic (F33) has established itself as a desirable used car option. The B48 engine has proven to be relatively reliable, although regular maintenance is crucial. The 8-speed Steptronic transmission is also known for its durability. The xDrive all-wheel-drive system adds to the car’s appeal in regions with inclement weather. As a used convertible, the F33 430i offers a compelling combination of style, performance, and luxury at a more accessible price point than when new. Its continued popularity in the used car market is a testament to its overall quality and driving experience.
