The Alpina B4 Coupe (facelift 2017) S 3.0, equipped with the Switch-Tronic 8-speed automatic transmission, represents a high-performance iteration of the BMW 4 Series Coupe. Produced between 2017 and 2019, this model occupies a niche position between the standard BMW 4 Series and the more track-focused M4. Alpina, a renowned German automotive engineering company, independently refines BMW vehicles, focusing on enhanced performance, luxury, and exclusivity. The B4 Coupe facelift builds upon the F32/F33 4 Series platform (internally known as the 1HX0/A3 platform), offering a unique blend of grand touring comfort and spirited driving dynamics.
Technical Specifications
| Brand | Alpina |
| Model | B4 |
| Generation | B4 Coupe (facelift 2017) |
| Type (Engine) | S 3.0 (440 Hp) Switch-Tronic |
| Start of production | 2017 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban | 10.9 l/100 km (21.6 US mpg) |
| Fuel consumption (economy) – extra urban | 6.2 l/100 km (37.9 US mpg) |
| Fuel consumption (economy) – combined | 7.9 l/100 km (29.8 US mpg) |
| CO2 emissions | 180 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 |
| Maximum speed | 306 km/h (190.14 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 3.8 kg/Hp |
| Weight-to-torque ratio | 2.6 kg/Nm |
| Power | 440 Hp @ 5500-6250 rpm |
| Power per litre | 147.7 Hp/l |
| Torque | 660 Nm @ 3000-4500 rpm (486.79 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 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Kerb Weight | 1690 kg (3725.81 lbs.) |
| Max. weight | 2135 kg (4706.87 lbs.) |
| Max load | 445 kg (981.06 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 S 3.0 lies Alpina’s meticulously tuned version of the BMW N55 inline-six engine. This 3.0-liter engine, designated as the B58 by Alpina, benefits from significant upgrades over the standard BMW unit. These include custom-designed pistons, a revised crankshaft, and larger turbochargers. The engine employs direct fuel injection and a twin-scroll turbocharger setup, delivering a potent 440 horsepower and 660 Nm (486.79 lb-ft) of torque. The Switch-Tronic 8-speed automatic transmission, based on the ZF 8HP series, is specifically calibrated by Alpina for both performance and comfort. It features a unique shift program and steering wheel-mounted shift paddles, allowing for manual gear selection. The transmission’s programming prioritizes smooth transitions and quick downshifts, enhancing the driving experience.
Driving Characteristics
The B4 Coupe S 3.0 delivers a compelling blend of performance and refinement. The 440 hp output, coupled with the responsive Switch-Tronic transmission, results in a 0-60 mph time of approximately 4.0 seconds and a top speed of 190 mph. Compared to the standard 4 Series models, the Alpina offers significantly more power and torque, resulting in noticeably quicker acceleration. While not as overtly aggressive as the M4, the B4 provides ample power for both highway cruising and spirited driving. The automatic transmission’s programming is geared towards providing a comfortable driving experience, with smooth gear changes and a relaxed cruising demeanor. However, Sport mode sharpens the shift points and throttle response, transforming the car into a more engaging performer. The rear-wheel-drive configuration contributes to a balanced chassis and predictable handling.
Equipment & Trim Levels
The Alpina B4 Coupe came exceptionally well-equipped as standard. Interior features typically included premium leather upholstery, Alpina-specific interior trim (often featuring wood or carbon fiber accents), sport seats with adjustable bolstering, and a high-end audio system. Standard exterior features included Alpina’s signature aerodynamic body kit, unique alloy wheels, and a sport exhaust system. Optional extras included a panoramic sunroof, adaptive suspension, and various customization options through Alpina’s bespoke program. The interior dashboard configuration retained the BMW layout but incorporated Alpina badging and unique instrument cluster graphics.
Chassis & Braking
The B4 Coupe’s chassis benefits from Alpina’s expertise in suspension tuning. While retaining the core BMW 4 Series architecture, the B4 features revised spring rates, dampers, and stabilizer bars. This results in a more compliant ride quality compared to the M4, while still providing excellent body control. The braking system consists of ventilated discs at all four corners, providing ample stopping power. The ABS (Anti-lock braking system) is standard, ensuring safe and controlled braking in various conditions. The steering is a rack-and-pinion system with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The Alpina B4 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 M4, offering a more refined and comfortable driving experience. Fuel economy, while not a primary focus, was respectable for a high-performance coupe, averaging around 29.8 US mpg in combined driving. Reliability was generally good, benefiting from Alpina’s meticulous engineering and quality control. Compared to the 428i or 435i models, the B4 offered a substantial performance upgrade, justifying its higher price tag. However, the M4 remained the benchmark for track performance.
Legacy
The Alpina B4 Coupe (facelift 2017) S 3.0 remains a desirable vehicle in the used car market. The B58 engine is known for its robustness and tunability, making it a popular choice among enthusiasts. The Switch-Tronic transmission is also regarded as a reliable and smooth-shifting unit. While maintenance costs may be higher than those of a standard BMW 4 Series, the B4’s unique character, performance, and exclusivity continue to attract a dedicated following. Its blend of grand touring comfort and impressive performance ensures its place as a distinctive and highly regarded performance coupe.
