The Alpina B6 Coupe (E63) 4.4 V8 S, produced from 2008 to 2010, represents a high-performance iteration of the BMW 6 Series Coupe, meticulously engineered by the independent German automotive engineering company, Alpina. Based on the E63 BMW 650i, the B6 Coupe wasn’t simply a cosmetic upgrade; it was a comprehensively revised vehicle focused on enhancing driving dynamics and delivering a uniquely refined grand touring experience. It occupied the top echelon of the 6 Series lineup, positioned above even the standard BMW M6 in terms of everyday usability and luxurious appointments, while offering comparable performance. The B6 Coupe is part of the broader Alpina B6 (E63/E64) series, which also included a convertible variant.
Technical Specifications
| Brand | Alpina |
| Model | B6 |
| Generation | B6 Coupe (E63) |
| Type (Engine) | 4.4 V8 S (530 Hp) |
| Start of production | 2008 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban | 22 l/100 km (10.7 US mpg, 12.8 UK mpg, 4.5 km/l) |
| Fuel consumption (economy) – extra urban | 8.7 l/100 km (27 US mpg, 32.5 UK mpg, 11.5 km/l) |
| Fuel consumption (economy) – combined | 18.6 l/100 km (12.6 US mpg, 15.2 UK mpg, 5.4 km/l) |
| 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 | 318 km/h (197.6 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 3.2 kg/Hp, 308.1 Hp/tonne |
| Weight-to-torque ratio | 2.4 kg/Nm, 421.5 Nm/tonne |
| Power | 530 Hp @ 5500 rpm |
| Power per litre | 120.5 Hp/l |
| Torque | 725 Nm @ 4750 rpm (534.73 lb.-ft. @ 4750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 4398 cm3 (268.38 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 82.7 mm (3.26 in.) |
| Compression ratio | 9:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Supercharger, Intercooler |
| Valvetrain | DOHC |
| Kerb Weight | 1720 kg (3791.95 lbs.) |
| Max. weight | 2190 kg (4828.12 lbs.) |
| Max load | 470 kg (1036.17 lbs.) |
| Trunk (boot) space – maximum | 450 l (15.89 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4820 mm (189.76 in.) |
| Width | 1855 mm (73.03 in.) |
| Height | 1371 mm (53.98 in.) |
| Wheelbase | 2780 mm (109.45 in.) |
| Front track | 1558 mm (61.34 in.) |
| Rear (Back) track | 1598 mm (62.91 in.) |
| 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 | 6 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 255/35 R20Rear wheel tires: 285/30 R20 |
Powertrain & Engine Architecture
At the heart of the B6 Coupe lies Alpina’s heavily modified version of the BMW N62 V8 engine. While retaining the basic 4.4-liter displacement (4398 cc), Alpina significantly enhanced the engine’s internals and employed a mechanically driven supercharger. This supercharger, unlike many turbocharger systems, provides instant boost response, contributing to the engine’s linear power delivery. The engine also features a revised cooling system, high-flow cylinder heads, and a custom engine management system. The result is a substantial power increase to 530 horsepower at 5,500 rpm and 725 Nm (534.73 lb-ft) of torque at 4,700 rpm. The engine utilizes multi-port fuel injection and a double-VANOS variable valve timing system. The B6 Coupe exclusively used a ZF 6HP26 6-speed automatic transmission, specifically calibrated by Alpina for smoother shifts and optimized performance. This transmission features Alpina’s “Switch-Tronic” manual shift mode, allowing drivers greater control.
Driving Characteristics
The Alpina B6 Coupe delivers a markedly different driving experience compared to the standard BMW 650i or even the M6. The supercharged V8 provides prodigious low-end torque, making the car feel effortlessly powerful in everyday driving situations. The automatic transmission, while not as aggressively geared as the M6’s single-clutch system, offers smooth and precise shifts. Acceleration is brisk, with 0-60 mph times consistently around 4.3 seconds and a top speed electronically limited to 197.6 mph. The suspension, while firm, is tuned for comfort, providing a more compliant ride than the M6. The steering is precise and well-weighted, offering good feedback. The overall driving experience is one of refined power and effortless cruising, making it an ideal grand tourer.
Equipment & Trim Levels
The B6 Coupe came exceptionally well-equipped as standard. Interior appointments included Alpina-specific leather upholstery, a unique wood trim, and Alpina-branded instrumentation. Standard features included a premium sound system, navigation, heated front seats, and automatic climate control. Optional extras included a panoramic sunroof, active steering, and various customization options through Alpina’s bespoke program. Alpina offered a wide range of interior and exterior color choices, allowing customers to personalize their vehicles. The interior generally featured a more luxurious and understated aesthetic compared to the sportier M6.
Chassis & Braking
The B6 Coupe’s chassis builds upon the BMW 6 Series platform, but with Alpina-specific modifications. The suspension features stiffer springs and dampers, along with thicker anti-roll bars, to improve handling and reduce body roll. The braking system utilizes ventilated discs all around, providing ample stopping power. ABS (Anti-lock Braking System) is standard. The car rides on staggered 20-inch Alpina wheels, shod with high-performance tires (255/35 R20 front, 285/30 R20 rear). These larger wheels and tires contribute to improved grip and handling.
Market Reception & Comparison
The Alpina B6 Coupe was generally well-received by automotive critics. It was praised for its unique blend of performance, luxury, and refinement. Compared to the BMW M6, the B6 Coupe was often seen as a more comfortable and usable daily driver, while still offering comparable performance. However, the M6’s more aggressive styling and sharper handling appealed to a different type of driver. Fuel economy, unsurprisingly, was not a strong point, with combined fuel consumption around 12.6 US mpg. Reliability was generally good, benefiting from Alpina’s meticulous engineering and quality control.
Legacy
The Alpina B6 Coupe (E63) remains a sought-after vehicle among enthusiasts. The supercharged V8 engine is known for its durability and tunability. While maintenance costs can be higher than a standard BMW 6 Series due to the specialized components, the B6 Coupe offers a unique and rewarding driving experience. On the used car market, well-maintained examples command a premium price, reflecting their rarity and exclusivity. The B6 Coupe represents a high point in Alpina’s history, showcasing the company’s ability to create truly special and distinctive automobiles.
