The BMW 4 Series Gran Coupe (G26 LCI), specifically the 430d variant introduced with the 2024 facelift, represents a blend of practicality and performance within BMW’s four-door coupe lineup. Production commenced in July 2024, positioning this model as a mid-range offering within the G26 generation, which itself is based on the BMW CLAR architecture. This variant combines a turbocharged diesel engine with mild hybrid technology and BMW’s xDrive all-wheel-drive system, aiming to deliver both efficiency and dynamic driving characteristics. The “LCI” designation signifies a Life Cycle Impulse, BMW’s term for a significant mid-generation refresh.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (G26 LCI, facelift 2024) |
| Type (Engine) | 430d (286 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | July, 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 5.7-6.3 l/100 km (41.3 – 37.3 US mpg, 49.6 – 44.8 UK mpg, 17.5 – 15.9 km/l) |
| CO2 emissions (WLTP) | 151-166 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5 sec |
| Maximum speed | 250 km/h (155.34 mph) – Electronically limited |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 6.5 kg/Hp, 155 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 352.3 Nm/tonne |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the front hood |
| Electric motor power | 11 Hp |
| Electric motor Torque | 25 Nm (18.44 lb.-ft.) |
| Electric motor location | Front, Longitudinal |
| Power | 286 Hp @ 4000 rpm |
| Torque | 650 Nm @ 1500-2500 rpm (479.42 lb.-ft. @ 1500-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B57D30B |
| 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 |
| Valvetrain | DOHC |
| Engine oil capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1845 kg (4067.53 lbs.) |
| Max. weight | 2400 kg (5291.09 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 | ICE and electric motor drive all four wheels, operating in mixed mode. |
| 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 heart of the 430d Gran Coupe LCI is the BMW B57D30B, a 3.0-liter inline-six diesel engine. This engine benefits from a single twin-scroll turbocharger, intercooling, and a sophisticated diesel commonrail fuel injection system. The B57 engine family is known for its robust construction and ability to handle significant power output. The 2024 LCI version incorporates a 48V mild hybrid system, featuring a belt-driven starter-generator. This system allows for extended start-stop functionality, regenerative braking, and a small power boost during acceleration (approximately 11 hp and 25 Nm of torque). The engine produces 286 horsepower at 4000 rpm and a substantial 650 Nm (479.42 lb-ft) of torque between 1500 and 2500 rpm. This torque output is a key characteristic of modern diesel engines, providing strong low-end and mid-range acceleration. The engine is paired with an 8-speed Steptronic automatic transmission, known for its smooth shifts and efficiency.
Driving Characteristics
The 430d Gran Coupe LCI delivers a refined and capable driving experience. The combination of the high-torque diesel engine and the eight-speed automatic transmission results in effortless cruising and strong acceleration. While not as overtly sporty as some of the gasoline-powered 4 Series variants, the 430d offers ample power for overtaking and maintaining highway speeds. The xDrive all-wheel-drive system provides excellent traction in various weather conditions. The mild hybrid system contributes to improved fuel economy and a smoother start-stop experience. The gear ratios are tuned for a balance between fuel efficiency and performance, with taller gears for highway cruising and shorter gears for quicker acceleration.
Equipment & Trim Levels
The 430d Gran Coupe LCI typically comes well-equipped as standard. Features include BMW’s iDrive infotainment system with a curved display, leather upholstery, automatic climate control, and a comprehensive suite of safety features. Optional extras include premium sound systems, advanced driver-assistance systems (such as adaptive cruise control and lane-keeping assist), and various cosmetic enhancements. Trim levels beyond the base model often add features like upgraded interior trim, larger wheels, and more sophisticated lighting systems.
Chassis & Braking
The G26 Gran Coupe utilizes a sophisticated chassis design featuring a spring strut front suspension and an independent multi-link rear suspension. Both ends incorporate stabilizer bars to reduce body roll during cornering. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. The electronic stability control system (DSC) works in conjunction with the xDrive all-wheel-drive system to maintain stability and control in challenging conditions.
Market Reception & Comparison
The 430d Gran Coupe LCI has been generally well-received by automotive critics. It is praised for its refined driving experience, fuel efficiency, and practicality. Compared to the gasoline-powered 430i, the 430d offers superior fuel economy and torque, making it a more suitable choice for drivers who prioritize efficiency and long-distance comfort. Compared to higher-performance 4 Series models (such as the M440i), the 430d offers a more balanced driving experience, sacrificing some outright performance for improved fuel economy and refinement.
Legacy
The B57 engine family has proven to be remarkably reliable, and the addition of the mild hybrid system in the 430d LCI is expected to further enhance its longevity. The 430d Gran Coupe LCI is likely to hold its value well in the used car market due to its combination of practicality, performance, and efficiency. As with any modern BMW, regular maintenance is crucial to ensure long-term reliability. The 48V system, while generally reliable, may require specialized diagnostic equipment for servicing.
