The BMW 4 Series Convertible (F33) 435d xDrive Steptronic, produced from 2014 to 2016, represents a compelling blend of performance, luxury, and efficiency within the broader F33 4 Series Convertible range. Positioned as a mid-to-high-end trim, the 435d offered a diesel-powered alternative to the gasoline engines, appealing to drivers seeking strong torque and improved fuel economy without sacrificing the open-air driving experience. This variant utilized BMW’s xDrive all-wheel-drive system and the Steptronic 8-speed automatic transmission, making it a sophisticated grand tourer.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Convertible (F33) |
| Type (Engine) | 435d (313 Hp) xDrive Steptronic |
| Start of production | 2014 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.8-7.0 l/100 km (34.6 – 33.6 US mpg) |
| Fuel consumption (extra urban) | 5.2-5.3 l/100 km (45.2 – 44.4 US mpg) |
| Fuel consumption (combined) | 5.7-5.9 l/100 km (41.3 – 39.9 US mpg) |
| CO2 emissions | 151-155 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.9 kg/Hp, 169.2 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 340.5 Nm/tonne |
| Power | 313 Hp @ 4000 rpm |
| Torque | 630 Nm @ 1500-2500 rpm (464.66 lb.-ft. @ 1500-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N57D30B |
| Engine displacement | 2993 cm3 (182.64 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 7.2 l (7.61 US qt | 6.34 UK qt) |
| Kerb Weight | 1850 kg (4078.55 lbs.) |
| Max. weight | 2290 kg (5048.59 lbs.) |
| Max load | 440 kg (970.03 lbs.) |
| Trunk (boot) space – minimum | 370 l (13.07 cu. ft.) |
| Fuel tank capacity | 57 l (15.06 US gal | 12.54 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 | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1399 mm (55.08 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1544 mm (60.79 in.) |
| Rear (Back) track | 1590 mm (62.6 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 |
| Tires size | 225/50 R17 94W; 225/45 R18; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 |
INTRODUCTION
The F33 435d xDrive Steptronic was introduced in 2014 as part of the first generation of the 4 Series Convertible, which replaced the 3 Series Convertible. Built on the BMW’s 1HX0/A3 platform, the F33 aimed to offer a more dynamic and stylish alternative to its predecessor. The 435d variant specifically targeted buyers who desired a premium convertible experience with the added benefits of diesel efficiency and the security of all-wheel drive. It occupied a sweet spot in the lineup, offering a significant performance upgrade over the 420d while remaining more economical than the gasoline-powered 435i and 440i models.
Powertrain & Engine Architecture
At the heart of the 435d lies BMW’s N57D30B inline-six diesel engine. This engine is renowned for its smooth operation, robust construction, and impressive torque output. The N57 features a common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A twin-scroll turbocharger with variable geometry turbine (VGT) technology minimizes turbo lag and maximizes boost across the rev range. The engine also incorporates an intercooler to further enhance performance. The 8-speed Steptronic automatic transmission is a key component, 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 distributes power between the front and rear axles as needed, providing enhanced traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 435d xDrive Steptronic delivers a refined and effortless driving experience. The engine’s substantial 630 Nm (464.66 lb.-ft.) of torque, available from just 1500 rpm, provides strong acceleration in virtually any gear. While not as outright quick as the 435i, the 435d feels remarkably responsive and capable. The 8-speed automatic transmission contributes to this, offering seamless gear changes and keeping the engine within its optimal power band. The xDrive system provides excellent grip and stability, inspiring confidence on both dry and wet roads. Compared to the manual transmission versions, the Steptronic automatic prioritizes comfort and ease of use, making it ideal for long-distance cruising. The gear ratios are tuned for a balance of acceleration and fuel efficiency.
Equipment & Trim Levels
The 435d xDrive Steptronic typically came well-equipped as standard. Features included leather upholstery, automatic climate control, a BMW iDrive infotainment system with a central display screen, and a premium sound system. Optional extras were plentiful, allowing buyers to personalize their vehicles. Popular options included a head-up display, adaptive cruise control, a navigation system, heated seats, and a wind deflector to reduce turbulence in the cabin when the roof was down. Interior trim options ranged from wood veneers to aluminum accents, allowing for a customized aesthetic.
Chassis & Braking
The F33 435d utilizes an independent suspension setup at all four corners. The front suspension features coil springs and struts, while the rear employs a multi-link design. This configuration provides a comfortable ride while maintaining good handling characteristics. The 435d is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS), dynamic stability control (DSC), and traction control are standard safety features. The steering is a rack-and-pinion system with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 435d xDrive Steptronic was generally well-received by automotive critics. It was praised for its strong performance, refined ride, and excellent fuel economy. Compared to the 435i, the 435d offered a more relaxed and efficient driving experience, making it a popular choice for those who frequently cover long distances. The 420d, while more affordable, lacked the performance and refinement of the 435d. Reliability reports suggest the N57 engine is generally robust, although preventative maintenance, particularly regarding the diesel particulate filter (DPF), is crucial. Fuel economy consistently proved to be a strong point, exceeding that of its gasoline counterparts.
Legacy
The BMW F33 435d xDrive Steptronic has established itself as a desirable used car. The N57 engine is known for its longevity, and well-maintained examples continue to provide reliable service. However, potential buyers should be aware of the potential for DPF issues and the importance of regular servicing. The combination of performance, luxury, and efficiency makes the 435d a compelling option for those seeking a premium convertible experience. Its enduring appeal lies in its ability to deliver a sophisticated and enjoyable driving experience without compromising on practicality or running costs.
