The BMW 8 Series Convertible (G14 LCI), specifically the 840i xDrive Steptronic variant, represents the facelifted iteration of the second generation 8 Series, launched in March 2022. This model builds upon the foundation laid by the G14 generation, offering a luxurious open-top grand touring experience. Positioned as a mid-range offering within the 8 Series Convertible lineup, the 840i balances performance and comfort, appealing to buyers seeking a sophisticated and capable convertible without the outright performance focus of the M8 Competition. It slots above the base 840i models and below the high-performance M8 variants.
Technical Specifications
| Brand | BMW |
| Model | 8 Series |
| Generation | 8 Series Convertible (G14 LCI, facelift 2022) |
| Type (Engine) | 840i (333 Hp) xDrive Steptronic |
| Start of production | March, 2022 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Combined fuel consumption (WLTP) | 8.8-9.2 l/100 km (26.7 – 25.6 US mpg, 32.1 – 30.7 UK mpg, 11.4 – 10.9 km/l) |
| CO2 emissions (WLTP) | 200-209 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.8 kg/Hp, 173.9 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 261.1 Nm/tonne |
| Power | 333 Hp @ 5500-6250 rpm |
| Power per litre | 111.1 Hp/l |
| Torque | 500 Nm @ 1700-4000 rpm (368.78 lb.-ft. @ 1700-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30C |
| Engine displacement | 2998 cm3 (182.95 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1915 kg (4221.85 lbs.) |
| Max. weight | 2400 kg (5291.09 lbs.) |
| Max load | 485 kg (1069.24 lbs.) |
| Trunk (boot) space – minimum | 280 l (9.89 cu. ft.) |
| Trunk (boot) space – maximum | 350 l (12.36 cu. ft.) |
| Fuel tank capacity | 68 l (17.96 US gal | 14.96 UK gal) |
| Length | 4851 mm (190.98 in.) |
| Width | 1902 mm (74.88 in.) |
| Width including mirrors | 2137 mm (84.13 in.) |
| Height | 1345 mm (52.95 in.) |
| Wheelbase | 2822 mm (111.1 in.) |
| Front track | 1627 mm (64.06 in.) |
| Rear (Back) track | 1642 mm (64.65 in.) |
| Front overhang | 953 mm (37.52 in.) |
| Rear overhang | 1076 mm (42.36 in.) |
| Ride height (ground clearance) | 118 mm (4.65 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.9 m (39.04 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 | 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 | Front wheel tires: 245/40 R19; 245/35 R20 Rear wheel tires: 275/35 R19; 275/30 R20 |
| Wheel rims size | Front wheel rims: 8J x 19; 8J x 20 Rear wheel rims: 9J x 19; 9J x 20 |
Powertrain & Engine Architecture
At the heart of the 840i xDrive Steptronic lies BMW’s B58B30C 3.0-liter inline-six engine. This engine is a member of the modular B-series family, known for its robust construction and sophisticated technology. It utilizes direct fuel injection, a twin-scroll turbocharger, and a double-VANOS variable valve timing system to deliver a potent combination of power and efficiency. The engine produces 333 horsepower at 5500-6250 rpm and 500 Nm (368.78 lb-ft) of torque between 1700 and 4000 rpm. This broad torque curve contributes to strong acceleration in real-world driving conditions. The engine is paired with an 8-speed Steptronic automatic transmission, which offers smooth and responsive shifts. The ‘xDrive’ designation indicates BMW’s intelligent all-wheel-drive system, which provides enhanced traction and stability, particularly in adverse weather conditions. The system is rear-biased, delivering a sporty driving feel while maintaining all-weather capability.
Driving Characteristics
The 840i xDrive Steptronic offers a refined and engaging driving experience. While not as overtly sporty as the M8, the 840i provides ample power for confident overtaking and effortless cruising. The 8-speed automatic transmission is well-tuned, providing quick and seamless gear changes. The all-wheel-drive system inspires confidence, particularly on slippery surfaces. Compared to a manual transmission equipped 840i (where available), the Steptronic automatic prioritizes ease of use and comfort over outright driver engagement. The automatic transmission’s programming is geared towards smooth transitions and fuel efficiency. Compared to the higher-output M8 Competition, the 840i offers a more relaxed and comfortable ride, making it a better choice for long-distance grand touring.
Equipment & Trim Levels
The 840i xDrive Steptronic comes standard with a comprehensive array of luxury features. Standard interior appointments include leather upholstery, power-adjustable seats with memory function, a premium sound system, and a large infotainment display with iDrive controller. Available options include upgraded leather trims, a Bowers & Wilkins Diamond Surround Sound System, active roll stabilization, and a head-up display. The convertible top is a fully automatic soft top, offering a quiet and comfortable cabin experience when raised. Exterior features include LED headlights, alloy wheels, and a sophisticated aerodynamic design.
Chassis & Braking
The 8 Series Convertible utilizes a sophisticated chassis design featuring a double-wishbone front suspension and an independent multi-link rear suspension. This setup provides a comfortable ride while maintaining precise handling. The 840i xDrive Steptronic is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard safety features. The suspension is tuned to balance comfort and handling, offering a more compliant ride than the stiffer suspension found in the M8 Competition.
Market Reception & Comparison
The 840i xDrive Steptronic was generally well-received by automotive critics. Reviewers praised its powerful engine, refined ride, and luxurious interior. Fuel economy was considered reasonable for a vehicle of its size and performance, with combined fuel consumption figures ranging from 8.8 to 9.2 l/100 km. Compared to the 840i variants with rear-wheel drive, the xDrive model offered superior traction and all-weather capability. Compared to the M8 Competition, the 840i was seen as a more practical and comfortable choice for everyday driving.
Legacy
The B58 engine family, including the B58B30C found in the 840i, has proven to be remarkably reliable. While preventative maintenance is crucial, these engines are generally known for their longevity and durability. The 8 Series Convertible (G14 LCI) represents a modern interpretation of the classic grand touring formula, offering a blend of performance, luxury, and technology. On the used car market, the 840i xDrive Steptronic is likely to hold its value well, appealing to buyers seeking a sophisticated and capable convertible with a proven powertrain.
