The BMW 4 Series Convertible (G23) received a Life Cycle Impulse (LCI), or facelift, in March 2024, bringing updates to its styling, technology, and powertrain options. The 430i xDrive Steptronic variant represents a mid-range offering within the G23 lineup, positioned between the base 420i and the performance-oriented M440i. This model combines a 2.0-liter turbocharged four-cylinder engine with BMW’s xDrive all-wheel-drive system and an eight-speed Steptronic automatic transmission, targeting buyers seeking a balance of performance, luxury, and all-weather capability in a convertible package.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Convertible (G23 LCI, facelift 2024) |
| Type (Engine) | 430i (245 Hp) xDrive Steptronic |
| Start of production | March, 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Combined fuel consumption (WLTP) | 7.3-8 l/100 km (32.2 – 29.4 US mpg, 38.7 – 35.3 UK mpg, 13.7 – 12.5 km/l) |
| CO2 emissions (WLTP) | 166-182 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.3 sec |
| Acceleration 0 – 62 mph | 6.3 sec |
| Acceleration 0 – 60 mph | 6 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 7.2 kg/Hp, 138.8 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 226.6 Nm/tonne |
| Power | 245 Hp @ 4500-6500 rpm |
| Power per litre | 122.6 Hp/l |
| Torque | 400 Nm @ 1600-4000 rpm (295.02 lb.-ft. @ 1600-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B48 |
| 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 |
| Valvetrain | Double-VANOS, VALVETRONIC |
| Engine oil capacity | 5.75 l (6.08 US qt | 5.06 UK qt) |
| Kerb Weight | 1765 kg (3891.16 lbs.) |
| Max. weight | 2260 kg (4982.45 lbs.) |
| Max load | 495 kg (1091.29 lbs.) |
| Trunk (boot) space – minimum | 300 l (10.59 cu. ft.) |
| Trunk (boot) space – maximum | 385 l (13.6 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 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 | 4768 mm (187.72 in.) |
| Width | 1852 mm (72.91 in.) |
| Width including mirrors | 2081 mm (81.93 in.) |
| Height | 1391 mm (54.76 in.) |
| Wheelbase | 2851 mm (112.24 in.) |
| Front track | 1573 mm (61.93 in.) |
| Rear (Back) track | 1612 mm (63.46 in.) |
| Front overhang | 858 mm (33.78 in.) |
| Rear overhang | 1059 mm (41.69 in.) |
| Ride height (ground clearance) | 123 mm (4.84 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 12 m (39.37 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Spring Strut, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| 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 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The 430i xDrive Steptronic is powered by BMW’s B48 2.0-liter inline-four cylinder engine. This engine utilizes direct fuel injection, a single twin-scroll turbocharger, and BMW’s VALVETRONIC variable valve timing and Double-VANOS variable camshaft timing systems. These technologies work in concert to optimize engine efficiency and power delivery across a broad RPM range. The engine produces 245 horsepower at 4500-6500 rpm and 295 lb-ft of torque between 1600-4000 rpm. The B48 engine is known for its responsiveness and relatively smooth operation. The eight-speed Steptronic automatic transmission is a torque-converter type, offering smooth shifts and adaptive shift programming. xDrive, BMW’s all-wheel-drive system, utilizes a multi-plate clutch to distribute torque between the front and rear axles, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 430i xDrive Steptronic delivers a comfortable and capable driving experience. While not as overtly sporty as the M440i, the 245 hp engine provides ample power for everyday driving and spirited acceleration. The xDrive system provides confident handling and traction, especially on slippery surfaces. The eight-speed automatic transmission is well-tuned, offering quick and seamless shifts. Compared to a manual transmission equipped 430i, the automatic prioritizes ease of use and comfort over outright driver engagement. The gear ratios are optimized for a balance of acceleration and fuel efficiency. The car feels planted and stable, with minimal body roll in corners, thanks to the well-tuned suspension.
Equipment & Trim Levels
The 430i xDrive Steptronic typically comes standard with features such as BMW’s iDrive infotainment system with a touchscreen display, navigation, Apple CarPlay and Android Auto compatibility, a premium sound system, leatherette upholstery, power-adjustable front seats, and automatic climate control. Optional extras include leather upholstery, a head-up display, a panoramic sunroof, adaptive cruise control, and a variety of driver-assistance systems. The LCI facelift brought updated interior trim options and new exterior color choices. The standard dashboard configuration features a digital instrument cluster and a central infotainment screen, integrated into a driver-focused cockpit design.
Chassis & Braking
The G23 4 Series Convertible utilizes a MacPherson strut front suspension and a multi-link rear suspension. The suspension is tuned to provide a balance of comfort and handling. The 430i xDrive models typically feature slightly stiffer springs and dampers compared to the base 420i to accommodate the increased weight of the xDrive system. Braking duties are handled by ventilated disc brakes at all four corners. ABS, dynamic stability control, and other electronic safety systems are standard. The steering is an electric power-assisted rack-and-pinion system, providing precise and responsive steering feel.
Market Reception & Comparison
The 430i xDrive Steptronic was generally well-received by automotive critics. It was praised for its comfortable ride, refined engine, and capable all-wheel-drive system. Compared to the 420i, the 430i offers a noticeable performance upgrade. Compared to the M440i, it provides a more affordable entry point into the 4 Series Convertible range, albeit with less power and a slightly less sporty driving experience. Fuel economy is respectable for a performance convertible, with combined WLTP figures ranging from 7.3 to 8 liters per 100 kilometers. Reliability has been generally good, although some owners have reported minor issues with the infotainment system.
Legacy
The B48 engine has proven to be a reliable and durable powerplant, and the eight-speed Steptronic transmission is also known for its longevity. The G23 4 Series Convertible, and specifically the 430i xDrive Steptronic variant, is expected to hold its value reasonably well in the used car market. Its combination of style, performance, and all-weather capability makes it an attractive option for buyers seeking a premium convertible experience. As a facelifted model, the 2024 LCI version benefits from the latest technology and styling updates, further enhancing its appeal.
