The Alpina B4 Coupe (facelift 2017) S Edition 99 3.0, producing 452 horsepower, represents a limited-production, high-performance variant of the B4 Coupe. Introduced in 2018 and produced through 2019, this model was built upon the BMW 4 Series (F32/F33) platform, specifically the facelifted version. Alpina, a renowned German automotive engineering company, independently refined the 4 Series, focusing on enhancing performance, luxury, and exclusivity. The “S Edition 99” designation signified a limited run of just 99 units, making it a highly sought-after vehicle among enthusiasts. It occupies the top performance tier within the B4 Coupe range, exceeding the standard B4 and offering a more focused driving experience.
Technical Specifications
| Brand | Alpina |
| Model | B4 |
| Generation | B4 Coupe (facelift 2017) |
| Type | S Edition 99 3.0 (452 Hp) Switch-Tronic |
| Start of production | 2018 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 12.1 l/100 km (19.4 US mpg, 23.3 UK mpg, 8.3 km/l) |
| Fuel consumption (extra urban) | 7.3 l/100 km (32.2 US mpg, 38.7 UK mpg, 13.7 km/l) |
| Fuel consumption (combined) | 9.1 l/100 km (25.8 US mpg, 31 UK mpg, 11 km/l) |
| CO2 emissions | 207 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 | 306 km/h (190.14 mph) |
| Emission standard | Euro 6 d-TEMP |
| Weight-to-power ratio | 3.6 kg/Hp, 279.9 Hp/tonne |
| Weight-to-torque ratio | 2.4 kg/Nm, 421.1 Nm/tonne |
| Power | 452 Hp @ 5500-6250 rpm |
| Power per litre | 151.7 Hp/l |
| Torque | 680 Nm @ 3000-4500 rpm (501.54 lb.-ft. @ 3000-4500 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 | 10.2:1 |
| Number of valves per cylinder | 4 |
| 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 S Edition 99 lies a 3.0-liter inline-six cylinder engine, designated as the B58 engine family by BMW (and refined by Alpina). This engine utilizes direct fuel injection and is equipped with twin turbochargers, along with an intercooler to manage intake air temperatures. The engine produces 452 horsepower at 5500-6250 rpm and a substantial 680 Nm (501.54 lb-ft) of torque between 3000 and 4500 rpm. The engine’s internals are upgraded compared to the standard BMW 4 Series, featuring reinforced pistons and connecting rods to handle the increased power output. The engine is longitudinally mounted at the front of the vehicle. The transmission is an 8-speed automatic, developed in collaboration with ZF, and branded as “Switch-Tronic” by Alpina. This transmission offers both fully automatic operation and manual gear selection via steering wheel-mounted paddles, providing drivers with greater control.
Driving Characteristics
The B4 S Edition 99 delivers exhilarating performance. The combination of the high-output engine and the quick-shifting Switch-Tronic transmission results in a 0-60 mph time of approximately 4 seconds and a top speed of 306 km/h (190.14 mph). The automatic transmission is tuned for both performance and comfort, offering smooth gear changes during normal driving and rapid shifts in Sport mode. Compared to the standard B4, the S Edition 99 provides a noticeably more responsive throttle and a more aggressive power delivery. While the standard B4 models with automatic transmissions offer a more relaxed driving experience, the S Edition 99 is geared towards enthusiasts seeking a more engaging and dynamic driving experience. The rear-wheel-drive configuration contributes to a balanced chassis and provides ample grip during cornering.
Equipment & Trim Levels
The S Edition 99 was exceptionally well-equipped, building upon the already luxurious standard B4 Coupe. Standard features included Alpina-specific exterior styling elements, such as a unique front spoiler, rear diffuser, and aerodynamic side skirts. The interior featured premium leather upholstery, Alpina-branded sports seats, a leather-wrapped steering wheel, and exclusive trim accents. Additional standard equipment included a high-end sound system, navigation system, and a comprehensive suite of driver-assistance features. Optional extras included a panoramic sunroof, upgraded interior trim materials, and a bespoke paint color options. The interior trim was typically a combination of dark woods and aluminum accents, creating a sophisticated and sporty ambiance.
Chassis & Braking
The B4 S Edition 99 benefits from a refined chassis setup. The suspension features Alpina-tuned springs and dampers, providing a balance between comfort and handling. The car is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The braking system is further enhanced by ABS (Anti-lock Braking System) and other electronic stability control systems. The car’s suspension is designed to minimize body roll during cornering and provide a stable and controlled ride. The steering is a rack-and-pinion system with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The Alpina B4 S Edition 99 was well-received by automotive critics, who praised its performance, luxury, and exclusivity. Reviewers noted the car’s powerful engine, responsive transmission, and well-balanced chassis. Compared to other high-performance coupes in its class, such as the BMW M4, the B4 S Edition 99 offered a unique blend of performance and refinement. While the M4 was often considered more track-focused, the B4 S Edition 99 prioritized comfort and everyday usability. Fuel economy, while not a primary concern for buyers of this vehicle, was respectable for its performance level, averaging around 25.8 US mpg in combined driving. Reliability was generally considered to be good, benefiting from Alpina’s meticulous engineering and quality control.
Legacy
The Alpina B4 S Edition 99 remains a highly desirable vehicle in the used car market. Its limited production run and unique specifications contribute to its collectibility. The B58 engine is known for its robustness and reliability, and with proper maintenance, these engines are expected to provide many years of trouble-free service. The Switch-Tronic transmission is also considered to be durable and reliable. The B4 S Edition 99 represents a compelling alternative to more mainstream high-performance coupes, offering a unique blend of luxury, performance, and exclusivity. Its status as a limited-edition model ensures its continued appeal to automotive enthusiasts and collectors.
