The BMW 4 Series Convertible (F33), specifically the 440i 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-to-upper trim level within the F33 range, the 440i offered a significant step up in power and refinement compared to the 428i and 430i models, while remaining more accessible than the high-performance M4 Convertible. This variant catered to buyers seeking a sophisticated grand tourer with capable all-wheel drive and the convenience of an eight-speed automatic transmission.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Convertible (F33, facelift 2017) |
| Type (Engine) | 440i (326 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) | 9.8-10.3 l/100 km (24 – 22.8 US mpg, 28.8 – 27.4 UK mpg, 10.2 – 9.7 km/l) |
| Fuel consumption (extra urban) | 5.8-6.1 l/100 km (40.6 – 38.6 US mpg, 48.7 – 46.3 UK mpg, 17.2 – 16.4 km/l) |
| Fuel consumption (combined) | 7.3-7.6 l/100 km (32.2 – 30.9 US mpg, 38.7 – 37.2 UK mpg, 13.7 – 13.2 km/l) |
| CO2 emissions | 169-177 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 | 5.7 kg/Hp, 176.2 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 243.2 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 | 1850 kg (4078.55 lbs.) |
| Max. weight | 2300 kg (5070.63 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%) | 1800 kg (3968.32 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 |
INTRODUCTION
The F33 generation of the BMW 4 Series Convertible, produced from 2013 to 2020, represented BMW’s continued commitment to the premium compact convertible market. The 2017 facelift brought with it updated styling, improved technology, and crucially, the introduction of the B58 engine in the 440i variant. This engine, a 3.0-liter turbocharged inline-six, replaced the previous N26 engine and offered a substantial increase in both power and torque. The xDrive all-wheel-drive system, paired with the Steptronic eight-speed automatic transmission, provided enhanced traction and stability, particularly in inclement weather. The 440i xDrive Steptronic aimed to deliver a refined and engaging driving experience, appealing to buyers who desired a luxurious and capable open-top vehicle.
Powertrain & Engine Architecture
At the heart of the 440i lies the B58B30A engine, a 3.0-liter (2998 cc) turbocharged inline-six cylinder powerplant. This engine is a significant departure from its predecessor, featuring a single twin-scroll turbocharger, direct fuel injection, and variable valve timing (VANOS) and valve lift (Valvetronic) technology. The B58 is known for its smooth power delivery, responsiveness, and overall reliability. The engine produces 326 horsepower at 5500 rpm and 450 Nm (331.9 lb-ft) of torque between 1380 and 5000 rpm. The Steptronic eight-speed automatic transmission is a torque-converter type, offering smooth and quick shifts. It features adaptive shift programs that adjust to the driver’s style and driving conditions. The xDrive all-wheel-drive system utilizes a multi-plate clutch to distribute torque between the front and rear axles, optimizing traction and stability.
Driving Characteristics
The 440i xDrive Steptronic delivers a refined and confident driving experience. The combination of the potent B58 engine and the eight-speed automatic transmission results in brisk acceleration – 0 to 60 mph in approximately 5.1 seconds. While not as overtly sporty as the M4 Convertible, the 440i offers ample power for both highway cruising and spirited driving. The xDrive system provides excellent grip, particularly on corner exit, inspiring confidence in various weather conditions. The automatic transmission is generally responsive, although some drivers may prefer the more direct control of a manual gearbox. The steering is precise and well-weighted, providing good feedback to the driver. Compared to the 428i/430i models, the 440i offers a noticeable increase in performance and a more engaging driving experience.
Equipment & Trim Levels
The 440i xDrive Steptronic typically came well-equipped as standard. Key features included leather upholstery, power-adjustable seats with memory function, a premium sound system, automatic climate control, and a navigation system. The convertible top was a fully automatic retractable hardtop, offering good insulation and security. Optional extras included heated seats, a head-up display, adaptive cruise control, a surround-view camera system, and various interior trim options. The interior design was typically finished with high-quality materials and a driver-focused layout.
Chassis & Braking
The F33 4 Series Convertible utilized a sophisticated chassis design. The front suspension featured independent coil springs and struts, while the rear employed an independent multi-link setup. This configuration provided a good balance between ride comfort and handling precision. The 440i xDrive models were typically equipped with larger brakes compared to the base models, featuring ventilated discs at all four corners. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard safety features. The steering system was a rack-and-pinion type with electric power assistance.
Market Reception & Comparison
The 440i xDrive Steptronic was generally well-received by automotive critics. Reviewers praised the engine’s performance, the transmission’s smoothness, and the xDrive system’s effectiveness. The car was often lauded for its blend of luxury, performance, and practicality. Compared to the 428i/430i, the 440i offered a significant performance upgrade, justifying the higher price tag for those seeking more power. Fuel economy was respectable for a performance convertible, averaging around 32 mpg combined. Reliability has generally been good, although some owners have reported minor issues with electronic components.
Legacy
The B58 engine has earned a reputation as one of BMW’s most reliable and robust powerplants. The 440i xDrive Steptronic, therefore, holds its value relatively well in the used car market. The combination of a powerful engine, all-wheel drive, and a comfortable interior makes it a desirable option for buyers seeking a premium convertible. With proper maintenance, the B58 engine is expected to provide many years of reliable service. The F33 4 Series Convertible, and particularly the 440i variant, represents a high point in BMW’s convertible lineage, offering a compelling blend of performance, luxury, and open-air enjoyment.
