The BMW 650i xDrive Steptronic Convertible (F12 LCI), produced from 2015 to 2018, represents the facelifted version of the F12 6 Series Convertible. This model occupied the high-performance end of the 6 Series lineup, offering a luxurious grand touring experience with potent power and all-wheel drive capability. The “LCI” (Life Cycle Impulse) designation signifies BMW’s mid-cycle refresh, bringing styling updates, revised technology, and refined engine tuning to the already successful F12 platform. It served as a direct competitor to other high-end luxury convertibles such as the Mercedes-Benz SL and Porsche 911 Cabriolet.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Convertible (F12 LCI, facelift 2015) |
| Type (Engine) | 650i (450 Hp) xDrive Steptronic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 13.0-13.2 l/100 km (18.1 – 17.8 US mpg, 21.7 – 21.4 UK mpg, 7.7 – 7.6 km/l) |
| Fuel consumption (extra urban) | 7.1-7.3 l/100 km (33.1 – 32.2 US mpg, 39.8 – 38.7 UK mpg, 14.1 – 13.7 km/l) |
| Fuel consumption (combined) | 9.3-9.5 l/100 km (25.3 – 24.8 US mpg, 30.4 – 29.7 UK mpg, 10.8 – 10.5 km/l) |
| CO2 emissions | 217-221 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.5 sec |
| Acceleration 0 – 62 mph | 4.5 sec |
| Acceleration 0 – 60 mph | 4.3 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 4.4 kg/Hp, 227.3 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 328.3 Nm/tonne |
| Power | 450 Hp @ 5500-6000 rpm |
| Power per litre | 102.4 Hp/l |
| Torque | 650 Nm @ 2000-4500 rpm (479.42 lb.-ft. @ 2000-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N63B44B |
| Engine displacement | 4395 cm3 (268.2 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 9 l (9.51 US qt | 7.92 UK qt) |
| Coolant | 10.9 l (11.52 US qt | 9.59 UK qt) |
| Kerb Weight | 1980 kg (4365.15 lbs.) |
| Max. weight | 2480 kg (5467.46 lbs.) |
| Max load | 500 kg (1102.31 lbs.) |
| Trunk (boot) space – minimum | 300 l (10.59 cu. ft.) |
| Trunk (boot) space – maximum | 350 l (12.36 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4894 mm (192.68 in.) |
| Width | 1894 mm (74.57 in.) |
| Height | 1365 mm (53.74 in.) |
| Wheelbase | 2855 mm (112.4 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear (Back) track | 1665 mm (65.55 in.) |
| Ride height (ground clearance) | 123 mm (4.84 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle (turning diameter) | 11.7 m (38.39 ft.) |
| 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 | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 |
| Wheel rims size | 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 |
Powertrain & Engine Architecture
The heart of the 650i xDrive is BMW’s N63B44B engine, a 4.4-liter twin-turbocharged V8. This engine is a significant evolution of the earlier N63 design, incorporating direct injection, Valvetronic variable valve timing, and double-VANOS variable camshaft timing. The twin-turbochargers are positioned within the V-shaped engine bank, promoting quicker response and improved packaging. The engine produces 450 horsepower at 5,500-6,000 rpm and a substantial 650 Nm (479 lb-ft) of torque between 2,000 and 4,500 rpm. This broad torque curve contributes to effortless acceleration in virtually any gear. The engine is paired with BMW’s 8-speed Steptronic automatic transmission, known for its smooth shifts and efficiency. The xDrive all-wheel-drive system intelligently distributes power between the front and rear axles, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 650i xDrive delivers a refined and powerful driving experience. The combination of the potent V8 engine and the eight-speed automatic transmission results in brisk acceleration – 0 to 60 mph in approximately 4.3 seconds. The xDrive system provides confident handling and stability, making the car feel planted and secure even when pushed hard. While not as overtly sporty as some competitors, the 650i prioritizes comfort and grand touring capabilities. The automatic transmission is well-tuned, offering both seamless shifts in automatic mode and responsive manual control via steering wheel-mounted paddles. The steering is precise and well-weighted, providing good feedback to the driver. Compared to the 640i models, the 650i offers a significantly more powerful and engaging driving experience, while sacrificing some fuel economy.
Equipment & Trim Levels
The 650i xDrive Convertible came standard with a comprehensive list of luxury features, including leather upholstery, power-adjustable heated seats, a premium sound system, navigation, and a host of driver-assistance systems. Optional extras included features like active ventilation for the seats, a head-up display, a Bang & Olufsen sound system, and various interior trim options. The LCI facelift brought updated interior trim materials and a revised iDrive infotainment system with improved functionality and a larger display screen. The convertible top was a multi-layer soft top that offered good insulation and a relatively quiet cabin experience when raised.
Chassis & Braking
The F12 6 Series Convertible features a sophisticated chassis design with a double-wishbone front suspension and an independent multi-link rear suspension. This setup provides a comfortable ride while maintaining good handling characteristics. The xDrive models typically featured slightly stiffer suspension tuning compared to rear-wheel-drive variants to accommodate the added weight and improve stability. Braking duties are handled by large disc brakes on all four wheels, with standard ABS and electronic brake-force distribution. The 650i xDrive often came equipped with larger brake rotors than the lower-trim models to cope with the increased power and weight.
Market Reception & Comparison
The 650i xDrive Convertible was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and refined driving experience. However, some reviewers noted that the car’s weight and size could make it feel less agile than some competitors. Fuel economy was also a common criticism, as the V8 engine consumed a significant amount of fuel, especially during spirited driving. Compared to the 640i models, the 650i offered a substantial performance upgrade but came at a higher price point. The 650i xDrive also offered superior all-weather capability compared to the rear-wheel-drive 640i and 650i models.
Legacy
The N63B44B engine, while powerful, has been known to require diligent maintenance, particularly regarding cooling system components and turbocharger health. Early versions of the N63 engine were prone to oil leaks and cooling system failures, but these issues were largely addressed in the later iterations, including the B44B version found in the F12 LCI. Today, well-maintained 650i xDrive Convertibles represent a compelling value on the used car market, offering a luxurious and powerful grand touring experience at a fraction of the original price. However, prospective buyers should be aware of the potential maintenance costs associated with the V8 engine and xDrive system and prioritize a thorough pre-purchase inspection.
