The BMW 4 Series Gran Coupe (G26 LCI), specifically the 430i xDrive Steptronic variant, represents the facelifted iteration of the second-generation 4 Series Gran Coupe, launched in July 2024. This model blends the sporty aesthetics of the 4 Series coupe with the practicality of a five-door fastback. Positioned as a mid-range offering within the 4 Series Gran Coupe lineup, the 430i xDrive caters to buyers seeking a balance between performance, luxury, and all-weather capability. It slots above the 420i models and below the more potent M440i variants.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (G26 LCI, facelift 2024) |
| Type (Engine) | 430i (245 Hp) xDrive Steptronic |
| Start of production | July, 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 7.1-7.8 l/100 km (33.1 – 30.2 US mpg, 39.8 – 36.2 UK mpg, 14.1 – 12.8 km/l) |
| CO2 emissions (WLTP) | 161-177 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.1 sec |
| Acceleration 0 – 62 mph | 6.1 sec |
| Acceleration 0 – 60 mph | 5.8 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 6.9 kg/Hp, 144.1 Hp/tonne |
| Weight-to-torque ratio | 4.3 kg/Nm, 235.3 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 | 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 |
| Valvetrain | VALVETRONIC, Double-VANOS |
| Engine oil capacity | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Kerb Weight | 1700 kg (3747.86 lbs.) |
| Max. weight | 2255 kg (4971.42 lbs.) |
| Max load | 555 kg (1223.57 lbs.) |
| Trunk (boot) space – minimum | 470 l (16.6 cu. ft.) |
| Trunk (boot) space – maximum | 1290 l (45.56 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| 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 | 4783 mm (188.31 in.) |
| Width | 1852 mm (72.91 in.) |
| Width including mirrors | 2073 mm (81.61 in.) |
| Height | 1442 mm (56.77 in.) |
| Wheelbase | 2856 mm (112.44 in.) |
| Front track | 1597 mm (62.87 in.) |
| Rear (Back) track | 1624 mm (63.94 in.) |
| Front overhang | 862 mm (33.94 in.) |
| Rear overhang | 1065 mm (41.93 in.) |
| Ride height (ground clearance) | 140 mm (5.51 in.) |
| Drag coefficient (Cd) | 0.26 |
| 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 | 225/55 R17 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The 430i xDrive Steptronic is powered by BMW’s B48B20B 2.0-liter inline-four cylinder engine. This engine utilizes direct fuel injection and a twin-scroll turbocharger with intercooling, producing 245 horsepower at 4500-6500 rpm and 400 Nm (295 lb-ft) of torque between 1600-4000 rpm. The engine incorporates BMW’s VALVETRONIC variable valve timing and Double-VANOS variable camshaft timing systems for optimized efficiency and responsiveness. The engine is longitudinally mounted at the front of the vehicle. Power is transmitted to all four wheels via BMW’s eight-speed Steptronic automatic transmission. This transmission features a torque converter and offers smooth, quick shifts. The xDrive all-wheel-drive system is primarily rear-biased, intelligently distributing torque between the front and rear axles based on driving conditions to maximize traction and stability.
Driving Characteristics
The 430i xDrive Steptronic delivers a refined and capable driving experience. The 245 hp engine provides ample power for everyday driving and confident overtaking maneuvers. While not as overtly sporty as the M440i, the 430i offers a pleasing balance of performance and comfort. The eight-speed automatic transmission is well-tuned, providing seamless gear changes and contributing to the car’s overall smoothness. The xDrive all-wheel-drive system enhances grip and stability, particularly in adverse weather conditions. Compared to a manual transmission equipped 430i, the Steptronic automatic prioritizes ease of use and convenience over driver engagement. The gear ratios are optimized for both fuel efficiency and acceleration, with a focus on providing strong mid-range torque.
Equipment & Trim Levels
The 430i xDrive Steptronic comes standard with a comprehensive array of features, including BMW’s iDrive infotainment system with a 14.9-inch curved display, navigation, Apple CarPlay and Android Auto compatibility, a premium sound system, and a suite of advanced driver-assistance systems such as lane departure warning, forward collision warning, and automatic emergency braking. Interior upholstery typically consists of Sensatec leatherette, with optional upgrades to genuine leather available. Standard dashboard trim includes aluminum accents, with various wood and carbon fiber options offered as extras. Common optional extras include a panoramic sunroof, heated seats, a head-up display, and adaptive suspension.
Chassis & Braking
The 4 Series Gran Coupe utilizes a sophisticated chassis design. The front suspension features a spring strut setup with a transverse stabilizer, while the rear employs an independent multi-link spring suspension, also with a stabilizer bar. This configuration provides a comfortable ride and precise handling. The 430i xDrive is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and electronic stability control systems further enhance safety and control. The steering system is an electric power-assisted rack and pinion setup, offering precise and responsive steering feel.
Market Reception & Comparison
The 430i xDrive Steptronic was generally well-received by automotive critics. Reviewers praised its blend of performance, luxury, and practicality. The fuel economy, rated at 7.1-7.8 l/100 km, was considered competitive for its class. Compared to the 420i models, the 430i offered a noticeable performance upgrade. In contrast to the M440i, the 430i provided a more accessible price point and a more comfortable ride. Reliability reports suggest that the B48 engine is generally robust, although preventative maintenance is crucial.
Legacy
The B48 engine family has proven to be a reliable and versatile powerplant for BMW. The 430i xDrive Steptronic, as a representative of this engine’s application in the G26 generation, is expected to hold its value reasonably well in the used car market. Its combination of performance, luxury, and all-wheel-drive capability makes it an attractive option for buyers seeking a sporty and practical grand tourer. Regular maintenance, including oil changes and adherence to BMW’s recommended service intervals, will be key to ensuring the long-term reliability of this powertrain.
