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 continuing through 2019, this model was built upon the BMW F32/F33 platform, specifically the facelifted version. Alpina, a renowned German automotive engineering company, meticulously refined the BMW 4 Series Coupe, focusing on enhanced performance, luxurious appointments, and exclusivity. The “S Edition 99” designation signified a limited run of just 99 units, making it a highly sought-after vehicle among enthusiasts and collectors. This variant occupied the top echelon of the B4 Coupe lineup, positioned above the standard B4 and offering a more potent and exclusive driving experience.
Technical Specifications
| Brand | Alpina |
| Model | B4 |
| Generation | B4 Coupe (facelift 2017) |
| Type | S Edition 99 3.0 (452 Hp) AWD 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) | 12.3 l/100 km (19.1 US mpg, 23 UK mpg, 8.1 km/l) |
| Fuel consumption (extra urban) | 7.4 l/100 km (31.8 US mpg, 38.2 UK mpg, 13.5 km/l) |
| Fuel consumption (combined) | 9.2 l/100 km (25.6 US mpg, 30.7 UK mpg, 10.9 km/l) |
| CO2 emissions | 209 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 3.9 sec |
| Acceleration 0 – 62 mph | 3.9 sec |
| Acceleration 0 – 60 mph | 3.7 sec |
| Maximum speed | 303 km/h (188.28 mph) |
| Emission standard | Euro 6 d-TEMP |
| Weight-to-power ratio | 3.7 kg/Hp, 269 Hp/tonne |
| Weight-to-torque ratio | 2.5 kg/Nm, 404.8 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 | 1680 kg (3703.77 lbs.) |
| Max. weight | 2200 kg (4850.17 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%) | 1800 kg (3968.32 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 | 1551 mm (61.06 in.) |
| Rear (Back) track | 1576 mm (62.05 in.) |
| Drive wheel | All wheel drive (4×4) |
| 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, internally designated as the B58. This engine is a product of BMW’s modern engine family, renowned for its blend of performance and efficiency. The S Edition 99 benefits from twin-turbocharging, utilizing two smaller turbochargers to minimize turbo lag and deliver a broad, flat torque curve. Direct fuel injection ensures precise fuel delivery, optimizing combustion and maximizing power output. 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. This power is channeled through an 8-speed automatic transmission, Alpina’s “Switch-Tronic” unit, which offers both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The transmission is specifically calibrated for smooth shifts and responsive performance. The engine is longitudinally mounted, driving all four wheels via Alpina’s xDrive all-wheel-drive system.
Driving Characteristics
The B4 S Edition 99 delivers a thrilling driving experience, characterized by its potent acceleration and confident handling. The all-wheel-drive system provides excellent traction, allowing for rapid launches and stable cornering. The 0-60 mph sprint is dispatched in approximately 3.7 seconds, and the car boasts a top speed of 303 km/h (188.28 mph). The Switch-Tronic transmission offers quick and precise gear changes, whether in automatic or manual mode. Compared to the standard B4, the S Edition 99 feels significantly more responsive and engaging. While the standard B4 offers a comfortable and refined driving experience, the S Edition 99 prioritizes performance, with a firmer suspension setup and more aggressive throttle mapping. Compared to other variants like the B4 Diesel, the S Edition 99 offers a dramatically different driving experience, focusing on high-revving power and exhilarating acceleration rather than fuel efficiency and low-end torque.
Equipment & Trim Levels
The S Edition 99 came exceptionally well-equipped, reflecting its status as the flagship B4 Coupe. Standard features included Alpina-specific exterior styling cues, such as a unique front spoiler, rear diffuser, and aerodynamic side skirts. The interior featured premium leather upholstery, Alpina sports seats, and a bespoke steering wheel. Other standard amenities included a high-end sound system, navigation system, and a comprehensive suite of driver-assistance features. Optional extras included carbon fiber trim, a panoramic sunroof, and upgraded interior lighting packages. The interior trim was typically a combination of dark woods and aluminum accents, creating a luxurious and sporty ambiance.
Chassis & Braking
The B4 S Edition 99 features a meticulously tuned chassis designed to complement its high-performance engine. The suspension utilizes adaptive dampers, allowing the driver to adjust the ride quality to suit their preferences. The front suspension incorporates a double-ball-joint design, enhancing steering precision and stability. The rear suspension features multi-link setup. Braking duties are handled by ventilated discs at all four corners, providing ample stopping power. The braking system is enhanced by ABS (Anti-lock Braking System) and other electronic stability control systems. The car rides on staggered 20-inch Alpina alloy wheels, shod with high-performance tires (245/30 ZR20 front, 265/30 ZR20 rear).
Market Reception & Comparison
The Alpina B4 S Edition 99 was well-received by automotive critics, who praised its performance, handling, and exclusivity. Reviewers noted the car’s impressive acceleration, precise steering, and comfortable ride quality. The limited production run further enhanced its appeal, making it a desirable collector’s item. Compared to the standard B4, the S Edition 99 offered a significant performance upgrade, justifying its higher price tag. While fuel economy was not a primary focus, the B4 S Edition 99 achieved respectable figures for a high-performance coupe, with a combined fuel consumption of 9.2 l/100 km (25.6 US mpg). Reliability was generally considered to be excellent, benefiting from Alpina’s meticulous engineering and quality control.
Legacy
The Alpina B4 S Edition 99 remains a highly regarded performance coupe. Its limited production run and unique specifications have ensured its continued desirability in the used car market. The B58 engine is known for its robustness and longevity, and the Switch-Tronic transmission has proven to be reliable. While maintenance costs may be higher than those of a standard BMW 4 Series Coupe, the B4 S Edition 99 offers a unique and rewarding driving experience that continues to appeal to enthusiasts today. It represents a compelling blend of performance, luxury, and exclusivity, cementing its place as a significant model in Alpina’s history.
