The BMW 4 Series Gran Coupe (G26 LCI), specifically the 430i variant with its 255 horsepower mild-hybrid powertrain and Steptronic automatic transmission, represents the latest iteration of BMW’s four-door coupe. Introduced in July 2024 as part of the Life Cycle Impulse (LCI) facelift, this model builds upon the foundation of the G26 generation, which debuted in 2021. Positioned as a mid-range offering within the 4 Series Gran Coupe lineup, the 430i balances performance, efficiency, and luxury, appealing to buyers seeking a sporty yet practical grand tourer. It slots above the 420i and below the more potent M440i in terms of performance and price.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (G26 LCI, facelift 2024) |
| Type (Engine) | 430i (255 Hp) Mild Hybrid Steptronic |
| Start of production | July, 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 8.7 l/100 km (27 US mpg) |
| Fuel consumption (extra urban) | 6.7 l/100 km (35.1 US mpg) |
| Fuel consumption (combined) | 7.8 l/100 km (30.2 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 5.8 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Weight-to-power ratio | 6.9 kg/Hp |
| Weight-to-torque ratio | 4.4 kg/Nm |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 11 Hp |
| Electric motor Torque | 25 Nm (18.44 lb.-ft.) |
| Power | 255 Hp @ 4700-6500 rpm |
| Torque | 400 Nm @ 1600-4500 rpm (295.02 lb.-ft.) |
| Engine Model/Code | B48B20O2 |
| Engine displacement | 1998 cm3 (121.93 cu. in.) |
| Number of cylinders | 4 |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 10.5:1 |
| Kerb Weight | 1768 kg (3897.77 lbs.) |
| Max. weight | 2295 kg (5059.61 lbs.) |
| Trunk (boot) space (min) | 470 l (16.6 cu. ft.) |
| Trunk (boot) space (max) | 1291 l (45.59 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal) |
| Length | 4787 mm (188.46 in.) |
| Width | 1852 mm (72.91 in.) |
| Height | 1442 mm (56.77 in.) |
| Wheelbase | 2856 mm (112.44 in.) |
| Number of gears | 8 |
| Gearbox type | Automatic (Steptronic) |
Powertrain & Engine Architecture
At the heart of the 430i Gran Coupe LCI lies the BMW B48B20O2 2.0-liter inline-four cylinder engine. This engine utilizes direct fuel injection and is turbocharged, incorporating BMW’s TwinPower Turbo technology with an intercooler. The engine produces 255 horsepower at 4700-6500 rpm and 295 lb-ft of torque between 1600-4500 rpm. The “O2” designation signifies updates to the engine management system and emissions control for the LCI facelift. Crucially, this version incorporates 48V mild-hybrid technology. A 48V starter-generator integrates with the engine, enabling features like extended start-stop operation, smoother auto start, and a small power boost during acceleration (approximately 11 hp). The engine is paired with BMW’s eight-speed Steptronic automatic transmission, known for its quick and smooth shifts. This transmission features a wider gear spread and optimized shift programming for improved efficiency and responsiveness.
Driving Characteristics
The 430i Gran Coupe delivers a refined and engaging driving experience. The 5.8-second 0-60 mph acceleration time is respectable, providing ample power for everyday driving and highway passing. The Steptronic transmission is well-tuned, offering seamless gear changes in both automatic and manual modes. Compared to the higher-performance M440i, the 430i prioritizes comfort and fuel economy, offering a more relaxed driving experience. While the M440i boasts a significantly more powerful six-cylinder engine, the 430i’s turbo four provides sufficient power for most drivers. The mild-hybrid system contributes to a smoother and more responsive feel, particularly during initial acceleration. The rear-wheel drive configuration provides a balanced chassis and engaging handling characteristics.
Equipment & Trim Levels
The 430i Gran Coupe LCI comes standard with a comprehensive suite of features, including BMW’s iDrive 8 infotainment system with a curved display, leatherette upholstery, automatic climate control, and a suite of advanced driver-assistance systems such as lane departure warning and forward collision warning. Optional extras include premium leather upholstery, a Harman Kardon sound system, a head-up display, and adaptive suspension. The LCI facelift brought updated interior trim options and new exterior color choices. Standard exterior features include LED headlights and taillights, and 18-inch alloy wheels. Larger wheel sizes (19 and 20 inches) are available as options.
Chassis & Braking
The 430i Gran Coupe utilizes a spring strut front suspension with a transverse stabilizer and an independent multi-link rear suspension, also with a stabilizer bar. This setup provides a good balance between comfort and handling. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control are standard features. The suspension tuning is geared towards a comfortable ride, but still offers a sporty feel when pushed. The steering is precise and well-weighted, providing good feedback to the driver.
Market Reception & Comparison
The 430i Gran Coupe LCI has been generally well-received by automotive critics. Reviewers praise its stylish design, comfortable interior, and engaging driving dynamics. The mild-hybrid system is noted for improving fuel economy and responsiveness. Compared to the 420i, the 430i offers a significant performance upgrade, while remaining more affordable than the M440i. Fuel economy figures of around 30.2 US mpg combined are competitive within its segment. Reliability reports suggest that the B48 engine is generally reliable, although regular maintenance is crucial.
Legacy
The B48 engine family has become a mainstay in BMW’s lineup, known for its efficiency and performance. The integration of 48V mild-hybrid technology in the 430i represents a step towards greater electrification. As a used car, the 430i Gran Coupe LCI is expected to hold its value well, thanks to its desirable combination of style, performance, and practicality. The mild-hybrid system, while not a full hybrid, adds a layer of future-proofing and may appeal to buyers seeking improved fuel economy and reduced emissions. Long-term reliability will depend on proper maintenance and driving habits, but the B48 engine has proven to be a durable and capable powerplant.
