The Alpina B3 Coupe (E46) 3.3 i 24V B3S Automatic, produced between 2003 and 2006, represents a unique blend of BMW engineering and Alpina’s signature refinement. Built on the E46 3 Series platform (specifically the coupe body style – 3E46), the B3S was positioned as a high-performance, luxurious alternative to the standard BMW offerings. It occupied the top tier of the E46 coupe range, offering significantly more power and a more exclusive experience than the 330Ci. Alpina, as a manufacturer in its own right, not merely a tuner, meticulously engineered the B3S with substantial modifications to the engine, suspension, and interior, resulting in a vehicle that delivered a distinct driving experience.
Technical Specifications
| Brand | Alpina |
| Model | B3 |
| Generation | B3 Coupe (E46) |
| Type (Engine) | 3.3 i 24V B3S (305 Hp) Automatic |
| Start of production | 2003 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 2 |
| Fuel consumption (economy) – urban | 17.9 l/100 km (13.1 US mpg, 15.8 UK mpg, 5.6 km/l) |
| Fuel consumption (economy) – extra urban | 7.9 l/100 km (29.8 US mpg, 35.8 UK mpg, 12.7 km/l) |
| Fuel consumption (economy) – combined | 11.6 l/100 km (20.3 US mpg, 24.4 UK mpg, 8.6 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.3 sec |
| Acceleration 0 – 62 mph | 6.3 sec |
| Acceleration 0 – 60 mph | 6 sec (Calculated) |
| Maximum speed | 266 km/h (165.28 mph) |
| Weight-to-power ratio | 5.3 kg/Hp, 188.3 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 223.5 Nm/tonne |
| Power | 305 Hp @ 6300 rpm |
| Power per litre | 91.2 Hp/l |
| Torque | 362 Nm @ 4800 rpm (267 lb.-ft. @ 4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 3346 cm3 (204.19 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 87 mm (3.43 in.) |
| Piston Stroke | 93.8 mm (3.69 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Kerb Weight | 1620 kg (3571.49 lbs.) |
| Max. weight | 2040 kg (4497.43 lbs.) |
| Max load | 420 kg (925.94 lbs.) |
| Trunk (boot) space – minimum | 410 l (14.48 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal, 13.86 UK gal) |
| Length | 4488 mm (176.69 in.) |
| Width | 1757 mm (69.17 in.) |
| Height | 1367 mm (53.82 in.) |
| Wheelbase | 2725 mm (107.28 in.) |
| Front track | 1471 mm (57.91 in.) |
| Rear (Back) track | 1472 mm (57.95 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, automatic transmission |
| Front suspension | Wishbone |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 225/40 ZR18; 255/35 ZR18 |
| Wheel rims size | 8J x 18; 9J X 18 |
INTRODUCTION
The Alpina B3 Coupe (E46) 3.3 i 24V B3S Automatic, produced from 2003 to 2006, was a limited-production, high-performance coupe based on the BMW E46 platform. Alpina, renowned for its meticulous engineering and luxurious appointments, took the already capable 3 Series coupe and elevated it to a new level of performance and exclusivity. The “B3S” designation signified a higher state of tune compared to the standard B3, boasting a more powerful engine and enhanced chassis components. This variant aimed to bridge the gap between the standard BMW 3 Series and the more focused M3, offering a unique blend of grand touring comfort and spirited performance.
Powertrain & Engine Architecture
At the heart of the B3S lies the Alpina-modified version of BMW’s M54 inline-six engine. Displacing 3.3 liters (3346 cc), the engine, internally designated as the Alpina D1 engine, featured a unique crankshaft, pistons, and cylinder head, along with a high-performance camshaft. The engine produced 305 horsepower at 6300 rpm and 362 Nm (267 lb-ft) of torque at 4800 rpm. Fuel delivery was managed by a Bosch Motronic MS5.2 multi-port fuel injection system. The engine’s valvetrain utilized double overhead camshafts (DOHC) with four valves per cylinder. The B3S was exclusively offered with a ZF 5HP30 five-speed automatic transmission, specifically calibrated by Alpina for smooth shifts and optimal performance. This transmission featured adaptive shift programs, adjusting to the driver’s style.
Driving Characteristics
The combination of the 3.3-liter engine and the five-speed automatic transmission provided a distinctive driving experience. While not as raw or visceral as the manual transmission-equipped M3, the B3S offered a refined and effortless surge of power. The automatic transmission, while not offering the direct engagement of a manual, provided smooth and relatively quick shifts. The gear ratios were optimized for both acceleration and cruising comfort. The B3S felt noticeably quicker than the standard 330Ci, with a 0-60 mph time of around 6 seconds and a top speed of 165 mph. The engine’s torque curve was broad and flat, providing ample power throughout the rev range, making it a capable performer in everyday driving situations as well as on winding roads.
Equipment & Trim Levels
The B3S came standard with a comprehensive list of features, reflecting its premium positioning. Interior appointments included Alpina-specific leather upholstery, often in exclusive color combinations, and wood trim. Standard equipment also included automatic climate control, power-adjustable front seats with memory function, a premium sound system, and xenon headlights. Alpina also offered a range of optional extras, including a sunroof, navigation system, and upgraded audio options. The exterior was distinguished by Alpina-specific aerodynamic enhancements, including a front spoiler, rear spoiler, and unique alloy wheels. A subtle Alpina badge on the trunk lid and side skirts further identified the vehicle.
Chassis & Braking
Alpina made significant modifications to the E46’s chassis to complement the increased power of the B3S. The suspension was revised with stiffer springs and dampers, along with thicker stabilizer bars, to reduce body roll and improve handling. The B3S retained the E46 coupe’s all-round ventilated disc brakes, but Alpina upgraded the brake pads and rotors for improved stopping power and fade resistance. The steering was also recalibrated for more precise feel and responsiveness. The B3S featured a rear-wheel-drive layout, contributing to its balanced handling characteristics.
Market Reception & Comparison
The Alpina B3S was generally well-received by automotive critics, who praised its blend of performance, luxury, and refinement. It was often seen as a compelling alternative to the BMW M3, offering a more comfortable and relaxed driving experience without sacrificing significant performance. Compared to the standard 330Ci, the B3S offered a substantial power increase and a more sophisticated chassis. Fuel economy, however, was considerably lower than the 330Ci due to the larger engine. Reliability was generally good, although the more complex engine and transmission required more diligent maintenance than the standard BMW models.
Legacy
The Alpina B3 Coupe (E46) 3.3 i 24V B3S Automatic remains a sought-after vehicle among enthusiasts. Its limited production numbers and unique character have contributed to its collectibility. The engine, while not as technologically advanced as some modern powerplants, is known for its durability and relatively straightforward maintenance. Well-maintained examples command a premium in the used car market. The B3S represents a high point in Alpina’s history, showcasing the company’s ability to create truly special and engaging automobiles. The combination of a powerful engine, refined chassis, and luxurious interior continues to appeal to drivers seeking a unique and rewarding driving experience.
