The Alpina B6 Cabrio (F12 LCI), produced from 2015 to 2018, represents a high-performance, luxury open-top grand tourer based on the BMW 6 Series Convertible (F12). Alpina, a renowned German automotive engineering company, meticulously refined the 6 Series, focusing on enhancing performance, handling, and exclusivity. The “LCI” designation refers to the Life Cycle Impulse, or facelift, applied to the 6 Series range in 2015, bringing updated styling and technology. This particular variant, equipped with the 4.4-liter V8 engine producing 600 horsepower and paired with Alpina’s Switch-Tronic eight-speed automatic transmission, occupied the top echelon of the B6 Cabrio lineup, offering a compelling blend of power, refinement, and open-air driving enjoyment.
Technical Specifications
| Brand | Alpina |
| Model | B6 |
| Generation | B6 Cabrio (F12 LCI, Facelift 2015) |
| Type (Engine) | 4.4 V8 (600 Hp) Switch-Tronic |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 13.2 l/100 km (17.8 US mpg, 21.4 UK mpg, 7.6 km/l) |
| Fuel consumption (extra urban) | 7.5 l/100 km (31.4 US mpg, 37.7 UK mpg, 13.3 km/l) |
| Fuel consumption (combined) | 9.6 l/100 km (24.5 US mpg, 29.4 UK mpg, 10.4 km/l) |
| CO2 emissions | 224 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.2 sec |
| Acceleration 0 – 62 mph | 4.2 sec |
| Acceleration 0 – 60 mph | 4.0 sec (Calculated) |
| Maximum speed | 327 km/h (203.19 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 3.4 kg/Hp, 297 Hp/tonne |
| Weight-to-torque ratio | 2.5 kg/Nm, 396 Nm/tonne |
| Power | 600 Hp @ 6000 rpm |
| Power per litre | 136.5 Hp/l |
| Torque | 800 Nm @ 3500-4500 rpm (590.05 lb.-ft. @ 3500-4500 rpm) |
| Engine layout | Front, Longitudinal |
| 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 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Kerb Weight | 2020 kg (4453.34 lbs.) |
| Max. weight | 2430 kg (5357.23 lbs.) |
| Max load | 410 kg (903.9 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.) |
| Width including mirrors | 2081 mm (81.93 in.) |
| Height | 1371 mm (53.98 in.) |
| Wheelbase | 2855 mm (112.4 in.) |
| Front track | 1594 mm (62.76 in.) |
| Rear (Back) track | 1623 mm (63.9 in.) |
| Front overhang | 941 mm (37.05 in.) |
| Rear overhang | 1098 mm (43.23 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Switch-Tronic |
| 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 | 255/35 ZR20; 295/30 ZR20 |
| Wheel rims size | 8.5J x 20; 10J x 20 |
INTRODUCTION
The Alpina B6 Cabrio (F12 LCI) represents the pinnacle of open-top performance within the BMW 6 Series Convertible range during its production run. Alpina, operating as an independent manufacturer but with a close relationship with BMW, took the already capable 6 Series and elevated it through extensive engineering modifications. The F12 LCI facelift brought subtle styling updates and improved technology, further refining the driving experience. This 600 horsepower variant, utilizing Alpina’s Switch-Tronic transmission, was positioned as the ultimate expression of the B6 Cabrio, catering to drivers seeking a luxurious yet exhilarating grand touring experience.
Powertrain & Engine Architecture
At the heart of the B6 Cabrio lies Alpina’s version of the BMW N63 engine – a 4.4-liter twin-turbocharged V8. While based on the BMW unit, Alpina extensively modified the engine with bespoke pistons, connecting rods, and turbochargers. These changes, along with a recalibrated engine management system, resulted in a significant power increase to 600 horsepower and 800 Nm (590 lb-ft) of torque. The engine employs direct fuel injection for precise fuel delivery and optimized combustion. The Switch-Tronic eight-speed automatic transmission is also a heavily modified version of the BMW unit, featuring Alpina’s proprietary software for faster shift times and more responsive operation. It offers a “Drive Select” system with Comfort, Sport, and Manual modes, allowing the driver to tailor the transmission’s behavior to their preferences. The engine’s longitudinal front-mid layout contributes to balanced weight distribution.
Driving Characteristics
The B6 Cabrio’s driving experience is characterized by a remarkable blend of power and refinement. The 600 horsepower and 800 Nm of torque deliver effortless acceleration, with 0-60 mph arriving in around 4 seconds and a top speed exceeding 200 mph. The Switch-Tronic transmission provides smooth and quick gear changes, whether in automatic or manual mode. Compared to the standard 6 Series Cabriolet or even the 650i, the Alpina offers a more immediate throttle response and a more aggressive exhaust note. While not as overtly track-focused as some high-performance sports cars, the B6 Cabrio provides ample power for spirited driving on winding roads. The gear ratios are tuned for both acceleration and comfortable high-speed cruising, making it an ideal grand tourer. Compared to the B6 Cabrio equipped with a manual transmission (available in some markets), the Switch-Tronic offers greater convenience and ease of use, particularly in traffic.
Equipment & Trim Levels
The Alpina B6 Cabrio came exceptionally well-equipped as standard. Interior appointments included Lavalina leather upholstery, Alpina-specific interior trim (often featuring wood or carbon fiber), and multi-contour sport seats with heating and ventilation. Standard features also included a premium sound system, navigation system, and a comprehensive suite of driver-assistance technologies. Optional extras included Alpina’s signature blue and green interior color combinations, extended leather trim, and a variety of customization options through Alpina’s bespoke program. The B6 Cabrio’s interior was designed to provide a luxurious and comfortable environment for both driver and passengers.
Chassis & Braking
Alpina made significant revisions to the 6 Series’ chassis to enhance handling and stability. The suspension was recalibrated with stiffer springs and dampers, and the anti-roll bars were upgraded. The B6 Cabrio featured ventilated disc brakes on all four wheels, providing ample stopping power. The braking system was also equipped with ABS (Anti-lock Braking System) and other electronic stability control systems. The car’s weight distribution was carefully optimized to improve cornering balance. Compared to the standard 6 Series, the Alpina’s suspension offered a firmer ride, but it remained comfortable enough for everyday driving.
Market Reception & Comparison
The Alpina B6 Cabrio was generally well-received by automotive critics, who praised its blend of performance, luxury, and exclusivity. Reviewers noted the engine’s impressive power and torque, the transmission’s responsiveness, and the car’s overall refinement. Compared to other high-performance convertibles in its class, such as the Porsche 911 Cabriolet, the B6 Cabrio offered a more luxurious and comfortable driving experience, albeit with slightly less focused handling. Fuel economy, while not a primary concern for buyers in this segment, was reasonable for a vehicle of this performance level. Reliability was generally good, benefiting from Alpina’s meticulous engineering and BMW’s robust mechanical components.
Legacy
The Alpina B6 Cabrio (F12 LCI) remains a desirable and collectible vehicle in the used car market. Its combination of performance, luxury, and exclusivity has ensured its enduring appeal. The 4.4-liter twin-turbo V8 engine and Switch-Tronic transmission have proven to be relatively reliable, although regular maintenance is essential. Values for well-maintained examples have remained strong, reflecting the car’s unique character and limited production numbers. The B6 Cabrio represents a high point in Alpina’s history, showcasing the company’s ability to transform already excellent BMW models into truly exceptional grand tourers.
