The BMW 8 Series Convertible (G14 LCI), specifically the 840i variant with the Steptronic automatic transmission, represents the facelifted iteration of the second-generation 8 Series. Introduced 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 strikes a balance between performance and comfort, appealing to buyers seeking a refined and capable convertible without the outright performance focus of the M8 Competition. It slots above the base 840d diesel 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) Steptronic |
| Start of production | March, 2022 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Combined fuel consumption (WLTP) | 8.4-8.8 l/100 km (28 – 26.7 US mpg, 33.6 – 32.1 UK mpg, 11.9 – 11.4 km/l) |
| CO2 emissions (WLTP) | 191-201 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.5 sec |
| Acceleration 0 – 62 mph | 5.5 sec |
| Acceleration 0 – 60 mph | 5.2 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.5 kg/Hp, 181 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 271.7 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 | 1840 kg (4056.51 lbs.) |
| Max. weight | 2340 kg (5158.82 lbs.) |
| Max load | 500 kg (1102.31 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) | 0.29 |
| Minimum turning circle (turning diameter) | 11.6 m (38.06 ft.) |
| Drivetrain Architecture | 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 | 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 Convertible lies BMW’s B58B30C 3.0-liter inline-six engine. This engine is a member of the modular B-series engine family, known for its smooth power delivery and efficiency. The B58 utilizes a single twin-scroll turbocharger, direct fuel injection, and Double-VANOS variable valve timing on both intake and exhaust camshafts. This combination results in a peak output of 333 horsepower at 5500-6250 rpm and 500 Nm (368 lb-ft) of torque available from a low 1700 rpm all the way to 4000 rpm. The engine’s architecture emphasizes responsiveness and a broad torque curve, making it well-suited for both relaxed cruising and spirited driving. The engine is paired with BMW’s 8-speed Steptronic automatic transmission. This transmission features a torque converter and offers smooth, quick shifts. Drivers can also manually select gears using steering wheel-mounted paddles, providing a degree of control when desired.
Driving Characteristics
The 840i Convertible delivers a refined and engaging driving experience. The combination of the potent inline-six engine and the 8-speed automatic transmission provides brisk acceleration, with a 0-60 mph time of around 5.2 seconds. While not as aggressively tuned as the M8, the 840i offers ample power for overtaking and enjoying open-road driving. The Steptronic transmission is programmed to prioritize comfort in normal driving modes, with smooth gear changes and a willingness to hold lower gears when cornering. The chassis is well-balanced, providing a comfortable ride without sacrificing handling precision. The convertible top, a soft-top design, can be raised or lowered in around 15 seconds at speeds up to 31 mph.
Equipment & Trim Levels
The 840i Convertible comes standard with a comprehensive list of features, reflecting its luxury positioning. Standard equipment includes leather upholstery, power-adjustable seats with memory function, a premium sound system, a 12.3-inch digital instrument cluster, and a 10.25-inch central infotainment display with iDrive 7 operating system. Available options include upgraded leather trims, ventilated and massaging seats, a Bowers & Wilkins Diamond Surround Sound System, and various driver-assistance systems such as adaptive cruise control, lane keeping assist, and parking assist. The interior design emphasizes a driver-focused layout with high-quality materials and meticulous attention to detail.
Chassis & Braking
The 8 Series Convertible utilizes a sophisticated chassis design. The front suspension features a double-wishbone setup, while the rear employs an independent multi-link suspension. This configuration provides a good balance between ride comfort and handling precision. The 840i 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 features, enhancing 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 840i Convertible was generally well-received by automotive critics. Reviewers praised its refined driving experience, luxurious interior, and powerful engine. Compared to the 840d, the 840i offers a more responsive and engaging driving experience, albeit with slightly lower fuel economy. Against the higher-performance M8 variants, the 840i provides a more comfortable and relaxed grand touring experience, sacrificing some outright performance. Fuel economy figures are rated at 8.4-8.8 l/100 km, which is respectable for a vehicle of this size and performance.
Legacy
The B58 engine has proven to be a reliable and durable powerplant, and the 840i Convertible is expected to hold its value well in the used car market. The combination of luxury, performance, and a well-engineered powertrain makes it an attractive option for buyers seeking a high-end convertible grand tourer. While the G14 LCI represents a refinement of the existing 8 Series formula, it continues to build upon the model’s reputation for quality and driving enjoyment. The 840i, in particular, offers a compelling blend of performance and comfort, making it a desirable choice for those who prioritize a refined and engaging driving experience.
