The BMW 650i Convertible (F12 LCI), produced from 2015 to 2018, represents the facelifted version of the second-generation 6 Series convertible. Positioned as the performance flagship of the 6 Series range, the 650i offered a luxurious grand touring experience with a powerful V8 engine. The “LCI” (Life Cycle Impulse) designation signifies BMW’s mid-cycle refresh, bringing styling updates, revised technology, and refinements to the existing platform. This variant occupied the premium segment of the 6 Series lineup, appealing to buyers seeking a blend of performance, luxury, and open-air driving enjoyment. It served as a direct competitor to other high-end 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) Steptronic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 12.4-12.7 l/100 km (19 – 18.5 US mpg, 22.8 – 22.2 UK mpg, 8.1 – 7.9 km/l) |
| Fuel consumption (extra urban) | 6.9-7.0 l/100 km (34.1 – 33.6 US mpg, 40.9 – 40.4 UK mpg, 14.5 – 14.3 km/l) |
| Fuel consumption (combined) | 8.9-9.1 l/100 km (26.4 – 25.8 US mpg, 31.7 – 31 UK mpg, 11.2 – 11 km/l) |
| CO2 emissions | 208-213 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.6 sec |
| Acceleration 0 – 62 mph | 4.6 sec |
| Acceleration 0 – 60 mph | 4.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 4.3 kg/Hp, 233.2 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 336.8 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 | 1930 kg (4254.92 lbs.) |
| Max. weight | 2425 kg (5346.21 lbs.) |
| Max load | 495 kg (1091.29 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.) |
| 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 | 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 |
INTRODUCTION
The F12 LCI 650i Convertible was built upon the success of the F12 platform, introduced in 2011. The LCI update, launched in 2015, brought revised styling cues, including new headlights with integrated LED daytime running lights, a redesigned kidney grille, and updated interior trim. The 650i specifically was positioned as the performance variant, offering a significant step up in power and refinement compared to the 640i models. It was a key offering for BMW in the luxury convertible market, targeting buyers who desired a sophisticated and powerful open-top driving experience.
Powertrain & Engine Architecture
At the heart of the 650i Convertible lies the N63B44B engine, a 4.4-liter twin-turbocharged V8. This engine is a cornerstone of BMW’s performance strategy, known for its robust power delivery and relatively smooth operation. The N63 features direct fuel injection, ensuring precise fuel metering and optimized combustion. The twin-turbocharger setup utilizes two scroll-twin turbochargers, minimizing turbo lag and providing a broad torque curve. 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. Paired with the engine is BMW’s 8-speed Steptronic automatic transmission. This transmission offers both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The Steptronic transmission is designed for smooth and quick shifts, contributing to the car’s overall performance and driving experience.
Driving Characteristics
The 650i Convertible delivers a refined yet exhilarating driving experience. The combination of the powerful V8 engine and the 8-speed automatic transmission results in brisk acceleration – 0 to 60 mph in approximately 4.4 seconds. The Steptronic transmission is well-tuned, providing seamless gear changes in automatic mode and responsive shifts when using the paddle shifters. While not as raw or focused as some dedicated sports cars, the 650i offers ample power for confident overtaking and enjoyable cruising. The suspension is tuned for comfort, providing a smooth ride even on less-than-perfect road surfaces. However, it still maintains a degree of body control, minimizing roll during cornering. Compared to the 640i models, the 650i offers a significantly more potent power delivery, making it the preferred choice for drivers prioritizing performance.
Equipment & Trim Levels
The 650i Convertible came standard with a comprehensive list of luxury features. Interior appointments included leather upholstery, power-adjustable seats with memory function, a premium sound system, and a navigation system. Standard exterior features included 18-inch alloy wheels, adaptive LED headlights, and a power-operated soft top. Optional extras were plentiful, including upgraded leather options, a head-up display, active steering, and various driver-assistance systems such as lane departure warning and blind-spot monitoring. The interior design emphasized luxury and sophistication, with high-quality materials and a driver-focused layout.
Chassis & Braking
The F12 6 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 650i Convertible is equipped with 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 system, offering precise and responsive steering feel.
Market Reception & Comparison
The 650i Convertible was generally well-received by automotive critics. Reviewers praised its powerful engine, luxurious interior, and refined driving experience. However, some noted the car’s relatively high price and complex technology. Compared to the 640i, the 650i offered a substantial performance advantage, but at a higher cost. Fuel economy, while respectable for a V8-powered convertible, was not a strong point, averaging around 26 mpg combined. Reliability was generally good, although the complex twin-turbocharged engine required diligent maintenance.
Legacy
The F12 650i Convertible remains a desirable grand tourer in the used car market. Its powerful engine, luxurious interior, and sophisticated technology continue to appeal to buyers seeking a premium open-top experience. The N63 engine, while complex, has proven to be relatively durable when properly maintained. Regular oil changes and adherence to BMW’s recommended service intervals are crucial for long-term reliability. Today, these convertibles represent a compelling value proposition for those seeking a high-performance luxury convertible without the depreciation hit of a newer model.
