The BMW 4 Series Convertible (F33) 440i Steptronic, produced from 2016, represents a compelling blend of performance and open-air luxury within the F33 generation of the 4 Series. Positioned as a mid-to-high range offering, the 440i aimed to deliver a more engaging driving experience than the 428i while remaining more accessible than the more focused M4 Convertible. This variant capitalized on BMW’s advancements in turbocharged engine technology and automatic transmission refinement, offering a sophisticated grand touring experience. It was a key model in BMW’s strategy to appeal to buyers seeking a premium convertible with strong performance credentials.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Convertible (F33) |
| Type (Engine) | 440i (326 Hp) Steptronic |
| Start of production | 2016 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 9.1-9.5 l/100 km (25.8 – 24.8 US mpg) |
| Fuel consumption (extra urban) | 5.5-5.8 l/100 km (42.8 – 40.6 US mpg) |
| Fuel consumption (combined) | 6.8-7.2 l/100 km (34.6 – 32.7 US mpg) |
| CO2 emissions | 159-167 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.4 sec |
| Acceleration 0 – 62 mph | 5.4 sec |
| Acceleration 0 – 60 mph | 5.1 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.4 kg/Hp, 184.2 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 254.2 Nm/tonne |
| Power | 326 Hp @ 5500 rpm |
| Torque | 450 Nm @ 1380-5000 rpm (331.9 lb.-ft. @ 1380-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30A |
| Engine displacement | 2998 cm3 (182.95 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 9.3 l (9.83 US qt | 8.18 UK qt) |
| Kerb Weight | 1770 kg (3902.18 lbs.) |
| Max. weight | 2230 kg (4916.31 lbs.) |
| Max load | 460 kg (1014.13 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 | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1384 mm (54.49 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1545 mm (60.83 in.) |
| Rear (Back) track | 1594 mm (62.76 in.) |
| Ride height (ground clearance) | 130 mm (5.12 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.3 m (37.07 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| 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 98W; 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 440i Convertible lies the B58B30A 3.0-liter inline-six engine. This engine is a cornerstone of BMW’s modern powertrain strategy, representing a significant leap forward in efficiency and performance compared to its predecessors. The B58 utilizes direct fuel injection, operating at pressures up to 200 bar, and is coupled with a twin-scroll turbocharger. This configuration minimizes turbo lag and delivers a broad, flat torque curve. The engine also features variable valve timing (VANOS) and variable valve lift (Valvetronic) technologies, optimizing engine breathing for improved responsiveness and fuel economy. The Steptronic 8-speed automatic transmission is a key component, offering smooth and quick shifts. It features adaptive learning, adjusting shift points based on driving style. The transmission also includes a launch control function for optimized acceleration.
Driving Characteristics
The 440i Convertible with the Steptronic transmission delivers a refined and engaging driving experience. While not as overtly sporty as the M4, the 440i provides ample power for both spirited driving and comfortable cruising. The 8-speed automatic transmission is well-tuned, offering seamless gear changes and contributing to a relaxed driving experience. The gear ratios are optimized for both acceleration and fuel efficiency. Compared to the 428i, the 440i offers a noticeable increase in power and torque, resulting in quicker acceleration and improved passing performance. Compared to a manual transmission equipped 440i, the Steptronic version prioritizes ease of use and comfort over ultimate driver involvement. The automatic transmission does slightly diminish the sense of connection to the car, but it makes the 440i more accessible to a wider range of drivers.
Equipment & Trim Levels
The 440i Convertible came standard with a generous array 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 ABS, stability control, and multiple airbags. Optional extras included features like a head-up display, navigation system, heated seats, and a Harman Kardon sound system. Interior trim options ranged from basic wood veneers to more luxurious carbon fiber accents. The convertible top was a fully automatic, retractable hardtop, providing a secure and quiet cabin environment when closed.
Chassis & Braking
The F33 4 Series Convertible utilizes a sophisticated chassis design, featuring an independent suspension at all four corners. The front suspension employs coil springs and struts, while the rear utilizes a multi-link setup. This configuration provides a good balance between ride comfort and handling precision. The 440i typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The braking system is augmented by ABS, electronic brakeforce distribution, and brake assist. The suspension tuning is slightly softer than the M4 Convertible, prioritizing comfort over outright track performance. Stabilizer bars are used front and rear to minimize body roll during cornering.
Market Reception & Comparison
The 440i Convertible was generally well-received by automotive critics. Reviewers praised its powerful engine, refined transmission, and comfortable ride. The combination of performance and luxury made it a compelling alternative to other premium convertibles in its class, such as the Audi A5 Cabriolet and Mercedes-Benz C-Class Cabriolet. Fuel economy was considered respectable for a performance convertible, although it didn’t match the efficiency of the 428i. Reliability reports have been generally positive, with the B58 engine proving to be a robust and durable unit. However, some owners have reported minor issues with the electronic systems.
Legacy
The BMW 440i Convertible (F33) has established itself as a desirable used car. The B58 engine is highly regarded for its performance and reliability, making it a popular choice among enthusiasts. The Steptronic transmission, while not as engaging as a manual, offers a smooth and convenient driving experience. The F33 generation 4 Series Convertible, and particularly the 440i variant, represents a sweet spot in the BMW lineup, offering a blend of performance, luxury, and practicality that continues to appeal to buyers today. Well-maintained examples command a premium in the used car market, reflecting their enduring appeal and the reputation of the B58 engine.
