The BMW 4 Series Gran Coupe (G26) 430i Steptronic, produced from June 2021 to June 2024, represents a compelling blend of sporty handling and practical usability within the 4 Series Gran Coupe lineup. Positioned as a mid-range offering, it caters to buyers seeking a balance between performance and comfort, slotting below the more potent M440i and above the base 430i models. This variant combines a 2.0-liter turbocharged inline-four engine with BMW’s eight-speed Steptronic automatic transmission, offering a refined driving experience geared towards everyday usability. The G26 generation, built on the BMW 3 Series (G20) platform, aimed to provide a more stylish and spacious alternative to traditional coupes, appealing to a broader customer base.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (G26) |
| Type (Engine) | 430i (245 Hp) Steptronic |
| Start of production | June, 2021 |
| End of production | June, 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 6.8-7.6 l/100 km |
| Combined fuel consumption (US mpg) | 34.6 – 30.9 |
| Combined fuel consumption (UK mpg) | 41.5 – 37.2 |
| Combined fuel consumption (km/l) | 14.7 – 13.2 |
| CO2 emissions (WLTP) | 156-173 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.2 sec |
| Acceleration 0 – 62 mph | 6.2 sec |
| Acceleration 0 – 60 mph | 5.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 6.7 kg/Hp, 148.9 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 243.2 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 | B48B20A |
| 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 |
| Engine oil capacity | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Coolant | 9.8 l (10.36 US qt | 8.62 UK qt) |
| Kerb Weight | 1645 kg (3626.6 lbs.) |
| Max. weight | 2200 kg (4850.17 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%) | 1600 kg (3527.4 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.) |
| Height | 1442 mm (56.77 in.) |
| Wheelbase | 2856 mm (112.44 in.) |
| Front track | 1595 mm (62.8 in.) |
| Rear (Back) track | 1623 mm (63.9 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 the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| 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 101Y XL |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
At the heart of the 430i Steptronic lies BMW’s B48B20A 2.0-liter inline-four engine. This engine utilizes a single, twin-scroll turbocharger, direct fuel injection, and BMW’s VALVETRONIC variable valve timing and lift system. VALVETRONIC allows for precise control of valve timing and lift, optimizing engine efficiency and responsiveness. The B48 engine is known for its smooth power delivery and relatively refined character. The eight-speed Steptronic automatic transmission is a torque-converter type, offering smooth and quick shifts. It features adaptive shift programs that adjust to the driver’s style and driving conditions. The transmission is geared towards comfort and efficiency, with relatively long gear ratios in the higher gears.
Driving Characteristics
The 430i Steptronic delivers a comfortable and capable driving experience. While not as overtly sporty as the M440i, it provides ample power for everyday driving and highway cruising. The 245 horsepower and 295 lb-ft of torque provide brisk acceleration, with a 0-60 mph time of around 5.9 seconds. The automatic transmission contributes to a relaxed driving experience, particularly in city traffic. Compared to the six-speed manual transmission available on some 430i models, the Steptronic offers smoother shifts but slightly less driver engagement. The long gear ratios prioritize fuel economy over outright performance, meaning the engine can feel slightly strained when pushed hard.
Equipment & Trim Levels
The 430i Steptronic typically came standard with features such as BMW’s iDrive infotainment system with a 12.3-inch touchscreen display, Apple CarPlay and Android Auto compatibility, a premium sound system, and a suite of advanced driver-assistance systems including lane departure warning and forward collision warning. Interior upholstery was typically Sensatec leatherette, with optional upgrades to genuine leather available. Common optional extras included a panoramic sunroof, heated seats, a head-up display, and a more powerful Harman Kardon sound system. Trim levels varied slightly depending on the market, but generally offered packages that bundled popular options together.
Chassis & Braking
The G26 430i Gran Coupe features a double-wishbone front suspension and an independent multi-link rear suspension. This setup provides a good balance of ride comfort and handling precision. The standard brakes consist of ventilated discs at all four corners, providing adequate stopping power for the vehicle’s weight and performance. The steering is an electric power-assisted rack-and-pinion system, offering precise and responsive steering feel. The chassis is tuned to prioritize comfort and stability, rather than outright sportiness, making it a pleasant vehicle for long-distance driving.
Market Reception & Comparison
The 430i Steptronic was generally well-received by automotive critics. It was praised for its comfortable ride, refined engine, and spacious interior. However, some critics noted that the automatic transmission could feel slightly hesitant at times, and that the car lacked the outright excitement of its more powerful siblings. Compared to the 440i, the 430i offered a more affordable entry point into the 4 Series Gran Coupe range, while still providing a premium driving experience. Fuel economy was competitive for its class, with combined fuel consumption figures ranging from 30.9 to 34.6 US mpg. Reliability has been generally good, with few widespread issues reported.
Legacy
The BMW 4 Series Gran Coupe (G26) 430i Steptronic has established itself as a popular choice in the used car market. The B48 engine has proven to be relatively reliable, although regular maintenance is crucial. The eight-speed Steptronic transmission is also generally dependable. These vehicles offer a good balance of performance, comfort, and practicality, making them appealing to a wide range of buyers. As with any used vehicle, a thorough inspection is recommended before purchase, paying particular attention to maintenance records and potential signs of wear and tear.
