The Alpina B4 Coupe 3.0 (410 Hp) Switch-Tronic represents a high-performance iteration of the BMW 4 Series Coupe, meticulously engineered by the independent German automotive engineering company, Alpina. Produced between 2014 and 2017, this model occupied a niche position between the standard BMW 4 Series and the more track-focused M4. It aimed to deliver a blend of grand touring comfort, everyday usability, and exhilarating performance, appealing to drivers seeking a refined yet potent coupe experience. The B4 Coupe is based on the BMW F32 4 Series platform, benefitting from Alpina’s signature enhancements to the engine, transmission, suspension, and aesthetics.
Technical Specifications
| Brand | Alpina |
| Model | B4 |
| Generation | B4 Coupe |
| Type (Engine) | 3.0 (410 Hp) Switch-Tronic |
| Start of production | 2014 |
| End of production | 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 10.2 l/100 km (23.1 US mpg) |
| Fuel consumption (extra urban) | 6.1 l/100 km (38.6 US mpg) |
| Fuel consumption (combined) | 7.6 l/100 km (30.9 US mpg) |
| CO2 emissions | 177 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 sec |
| Maximum speed | 303 km/h (188.28 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 3.9 kg/Hp |
| Weight-to-torque ratio | 2.7 kg/Nm |
| Power | 410 Hp @ 5500-6250 rpm |
| Power per litre | 137.6 Hp/l |
| Torque | 600 Nm @ 3000-4000 rpm (442.54 lb.-ft.) |
| 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 | 10.2:1 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Kerb Weight | 1615 kg (3560.47 lbs.) |
| Max. weight | 2135 kg (4706.87 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 445 l (15.72 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Permitted trailer load with brakes (12%) | 1700 kg (3747.86 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4640 mm (182.68 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1373 mm (54.06 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1552 mm (61.1 in.) |
| Rear (Back) track | 1576 mm (62.05 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 | 245/30 ZR20; 265/30 ZR20 |
| Wheel rims size | 8J x 20; 9J x 20 |
Powertrain & Engine Architecture
At the heart of the B4 Coupe 3.0 lies Alpina’s version of the BMW N55 inline-six engine. While sharing a fundamental architecture with the standard N55, Alpina extensively modified the engine to achieve its 410 horsepower output. These modifications included larger turbochargers, a revised intercooler system, a high-performance cooling system, and a bespoke engine management system. The engine utilizes direct fuel injection and double-VANOS variable valve timing, contributing to its responsiveness and efficiency. The 3.0-liter displacement is achieved with a bore of 84mm and a stroke of 89.6mm. The engine’s torque peak of 600 Nm (442.54 lb-ft) is available from 3000 to 4000 rpm, providing strong acceleration across a wide rev range.
The “Switch-Tronic” transmission is an 8-speed automatic gearbox developed in collaboration with ZF. It features a torque converter lockup clutch that engages in all gears, enhancing efficiency and responsiveness. Drivers can choose between Drive and Sport modes, with Sport mode offering quicker shifts and a more aggressive shift pattern. Manual gear selection is also available via steering wheel-mounted paddles, providing greater control during spirited driving.
Driving Characteristics
The B4 Coupe 3.0 delivers a distinctly refined driving experience. The combination of the potent engine and the smooth-shifting Switch-Tronic transmission results in effortless acceleration. The 0-60 mph sprint takes approximately 4 seconds, and the car boasts a top speed of 303 km/h (188.28 mph). Compared to the standard 435i, the Alpina B4 offers a more immediate throttle response and a more muscular feel. While not as overtly aggressive as the M4, the B4 provides ample power for both highway cruising and spirited driving on winding roads. The suspension is tuned to provide a comfortable ride without sacrificing handling precision. The rear-wheel-drive configuration contributes to a balanced chassis and engaging driving dynamics.
Equipment & Trim Levels
The Alpina B4 Coupe 3.0 came generously equipped as standard. Interior features included leather upholstery, sport seats, a premium sound system, and Alpina-specific interior trim elements, such as unique wood veneers and a numbered production plaque. Standard exterior features included Alpina aerodynamic body kit, signature Alpina wheels, and stainless steel exhaust system. Optional extras included a panoramic sunroof, adaptive headlights, and a driver assistance package with features like lane departure warning and blind-spot monitoring. The interior color schemes were customizable, allowing buyers to personalize their vehicles.
Chassis & Braking
The B4 Coupe utilizes the standard BMW 4 Series chassis, but with Alpina-specific modifications to the suspension. These modifications included stiffer springs, revised dampers, and a larger rear stabilizer bar. These changes aimed to improve handling and reduce body roll without compromising ride comfort. The braking system featured ventilated discs on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and Electronic Stability Control (ESC) systems were standard, enhancing safety and stability.
Market Reception & Comparison
The Alpina B4 Coupe 3.0 was generally well-received by automotive critics. It was praised for its blend of performance, luxury, and refinement. Reviewers noted that it offered a compelling alternative to the BMW M4, particularly for drivers who prioritized comfort and everyday usability. Compared to the 435i, the B4 offered a significant performance upgrade, while remaining more approachable than the track-focused M4. Fuel economy was respectable for a high-performance coupe, with combined fuel consumption of 7.6 l/100 km (30.9 US mpg). Reliability was generally good, although maintenance costs were higher than those of the standard 4 Series due to the specialized components and Alpina’s higher labor rates.
Legacy
The Alpina B4 Coupe 3.0 has established itself as a desirable and collectible vehicle in the used car market. The N55 engine, while known for some oil consumption issues in certain applications, has proven to be relatively durable when properly maintained. The Switch-Tronic transmission is also considered reliable. The B4 Coupe’s exclusivity and unique character contribute to its enduring appeal. As a limited-production model, it represents a distinctive and rewarding ownership experience for enthusiasts seeking a high-performance coupe with a touch of German engineering flair.
