The Alpina B3 Coupe (E92) 3.0i Biturbo, produced between 2007 and 2013, represents a unique blend of high performance and understated luxury within the BMW 3 Series lineage. Positioned as a more exclusive and potent alternative to the standard 3 Series Coupe, the B3 utilized a heavily modified BMW engine and drivetrain, coupled with Alpina’s signature attention to detail. This variant, equipped with the 3.0-liter biturbo inline-six engine and Alpina’s Switch-Tronic six-speed automatic transmission, offered a compelling package for drivers seeking a refined yet exhilarating grand touring experience. It sat at the top of the B3 Coupe range, offering significantly more power than the naturally aspirated 3.0si models.
Technical Specifications
| Brand | Alpina |
| Model | B3 |
| Generation | B3 Coupe (E92) |
| Type (Engine) | 3.0i Biturbo (360 Hp) Switch-Tronic Allrad |
| Start of production | 2007 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 14.6 l/100 km (16.1 US mpg, 19.3 UK mpg, 6.8 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) | 10.1 l/100 km (23.3 US mpg, 28 UK mpg, 9.9 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 280 km/h (173.98 mph) |
| Emission standard | Euro 4 |
| Power | 360 Hp @ 5500-6000 rpm |
| Power per litre | 120.8 Hp/l |
| Torque | 500 Nm @ 3800-5000 rpm (368.78 lb.-ft. @ 3800-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 2979 cm3 (181.79 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 89.6 mm (3.53 in.) |
| Compression ratio | 9.4:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Fuel tank capacity | 63 l (16.64 US gal, 13.86 UK gal) |
| Length | 4580 mm (180.31 in.) |
| Width | 1782 mm (70.16 in.) |
| Height | 1395 mm (54.92 in.) |
| Wheelbase | 2760 mm (108.66 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Spring Strut |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Steering type | Steering rack and pinion |
| Tires size | 245/40 R18ZR |
Powertrain & Engine Architecture
At the heart of the B3 Coupe 3.0i Biturbo lies the Alpina-modified version of the BMW N54 engine. This 3.0-liter inline-six engine utilizes twin turbochargers, a significant upgrade over the single-turbo setup found in some contemporary BMW models. Alpina’s enhancements included revised turbocharger internals, a larger intercooler, and a bespoke engine management system. The engine produced 360 horsepower at 5500-6000 rpm and a substantial 500 Nm (368 lb-ft) of torque between 3800 and 5000 rpm. Fuel is delivered via multi-port fuel injection. The engine features a double overhead camshaft (DOHC) valvetrain, optimizing airflow for increased performance. The ‘Switch-Tronic’ six-speed automatic transmission, developed in collaboration with ZF, offered both fully automatic operation and manual gear selection via steering wheel-mounted shift paddles. This transmission was specifically tuned to complement the engine’s power delivery, providing smooth shifts and responsive performance.
Driving Characteristics
The B3 Coupe 3.0i Biturbo delivered a markedly different driving experience compared to the standard 3 Series Coupe. The twin-turbocharged engine provided a broad and potent powerband, with minimal turbo lag. Acceleration was brisk, with 0-60 mph times consistently in the 4.7-4.9 second range. The Switch-Tronic transmission, while not as overtly sporty as a dual-clutch gearbox, offered quick and precise shifts in both automatic and manual modes. The rear-wheel-drive configuration contributed to a balanced chassis, providing confident handling and predictable cornering behavior. Compared to the naturally aspirated 3.0si, the B3 offered significantly more torque and a more effortless surge of power. While the manual transmission offered in other B3 variants provided a more engaging experience for some drivers, the Switch-Tronic automatic prioritized comfort and ease of use, making it well-suited for long-distance cruising.
Equipment & Trim Levels
The Alpina B3 Coupe was exceptionally well-equipped, even by premium standards. Standard features included leather upholstery, heated front seats, a premium sound system, and a sunroof. Alpina-specific touches were evident throughout the interior, including unique instrument cluster graphics, a bespoke steering wheel, and Alpina-branded door sills and floor mats. Optional extras included navigation, upgraded leather trim, and a variety of exterior styling enhancements. The interior generally featured a dark wood trim, emphasizing the luxurious nature of the vehicle. The B3 did not adhere to BMW’s traditional trim level structure (e.g., Sport, Luxury, M Sport); it was positioned as a fully-equipped, high-performance model from the outset.
Chassis & Braking
The B3 Coupe utilized the standard BMW E92 chassis, but with several Alpina-specific modifications. Suspension components were recalibrated to provide a balance between comfort and handling. The suspension featured spring struts in the front and coil springs in the rear. Braking duties were handled by ventilated discs at all four corners, providing ample stopping power. While the standard 3 Series Coupe offered rear drum brakes on some models, the B3 exclusively featured ventilated rear discs. The steering system employed a rack and pinion setup, offering precise and responsive steering feel.
Market Reception & Comparison
The Alpina B3 Coupe was generally well-received by automotive critics, who praised its blend of performance, luxury, and exclusivity. It was often positioned as a compelling alternative to the BMW M3, offering a more refined and comfortable driving experience. Fuel economy, while not a primary focus, was respectable for a high-performance coupe, averaging around 23.3 US mpg in combined driving. Compared to the 3.0si, the B3 offered a significant performance advantage, but at a higher price point. Reliability was generally good, although the complex twin-turbocharged engine required diligent maintenance.
Legacy
The Alpina B3 Coupe (E92) 3.0i Biturbo remains a sought-after vehicle in the used car market. Its combination of performance, luxury, and relative rarity has contributed to its enduring appeal. The N54 engine, while known for its potential maintenance needs (particularly regarding cooling system components and fuel injectors), is generally considered robust when properly maintained. Today, these cars represent a unique opportunity to own a high-performance coupe that offers a distinctive driving experience and a touch of exclusivity. The Switch-Tronic transmission, while not as technologically advanced as modern transmissions, continues to provide smooth and reliable operation.
