The Alpina B3 3.3i (E46) represents a unique blend of BMW engineering and Alpina’s renowned performance enhancements. Produced between 2001 and 2005, this model occupied a niche position within the E46 3 Series lineup, offering a more exclusive and powerful alternative to the standard BMW offerings. It was based on the E46 platform (1HX0/A3) and distinguished itself through its naturally aspirated engine, all-wheel drive system, and refined interior appointments. The “Switchtronic” designation refers to the automatic transmission with manual shift capability. This variant was positioned as a high-performance, luxury sedan aimed at drivers seeking a more engaging and sophisticated driving experience than the standard 3 Series could provide.
Technical Specifications
| Brand | Alpina |
| Model | B3 |
| Generation | B3 (E46) |
| Type (Engine) | 3.3 i 24V Switchtronic Allrad (280 Hp) |
| Start of production | 2001 |
| End of production | 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 17.1 l/100 km (13.8 US mpg, 16.5 UK mpg, 5.8 km/l) |
| Fuel consumption (extra urban) | 8.4 l/100 km (28 US mpg, 33.6 UK mpg, 11.9 km/l) |
| Fuel consumption (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 | 6.9 sec |
| Acceleration 0 – 62 mph | 6.9 sec |
| Acceleration 0 – 60 mph | 6.6 sec |
| Maximum speed | 256 km/h (159.07 mph) |
| Weight-to-power ratio | 5.6 kg/Hp, 179.5 Hp/tonne |
| Weight-to-torque ratio | 4.7 kg/Nm, 214.7 Nm/tonne |
| Power | 280 Hp @ 6200 rpm |
| Power per litre | 84.8 Hp/l |
| Torque | 335 Nm @ 4500 rpm (247.08 lb.-ft. @ 4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 3300 cm3 (201.38 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 86.4 mm (3.4 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 | 1560 kg (3439.21 lbs.) |
| Max. weight | 2060 kg (4541.52 lbs.) |
| Max load | 500 kg (1102.31 lbs.) |
| Trunk (boot) space – minimum | 440 l (15.54 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal, 13.86 UK gal) |
| Length | 4471 mm (176.02 in.) |
| Width | 1739 mm (68.46 in.) |
| Height | 1414 mm (55.67 in.) |
| Wheelbase | 2725 mm (107.28 in.) |
| Front track | 1471 mm (57.91 in.) |
| Rear (Back) track | 1481 mm (58.31 in.) |
| Drive wheel | All wheel drive (4×4) |
| 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 |
| Power steering | Hydraulic Steering |
| Tires size | 225/40 ZR18; 255/35 ZR18 |
| Wheel rims size | 8J X 18; 9J X 18 |
Powertrain & Engine Architecture
At the heart of the B3 3.3i lies Alpina’s modified version of the BMW M3’s S54 inline-six engine. While sharing the same basic architecture as the M3’s powerplant, Alpina detuned the engine slightly, focusing on a broader torque curve and improved drivability. The 3.3-liter engine (3245 cc) produces 280 horsepower at 6200 rpm and 335 Nm (247 lb-ft) of torque at 4500 rpm. It features a cast iron block, aluminum cylinder head with double overhead camshafts (DOHC), and four valves per cylinder. The engine utilizes a Bosch Motronic MS5.1 engine management system and multi-port fuel injection. The “Switchtronic” automatic transmission is a five-speed unit developed in collaboration with ZF. It offers both fully automatic operation and a manual shift mode, allowing drivers to select gears for more spirited driving. The all-wheel-drive system, utilizing a viscous coupling, provides enhanced traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The B3 3.3i offers a distinctly different driving experience compared to the standard E46 3 Series or even the M3. The detuned engine delivers a smooth and linear power delivery, making it exceptionally tractable in everyday driving situations. While not as aggressively focused as the M3, the B3 still provides ample performance, accelerating from 0 to 60 mph in approximately 6.6 seconds and reaching a top speed of 159 mph. The automatic transmission, while not as quick-shifting as a dual-clutch gearbox, offers smooth and refined gear changes. The all-wheel-drive system provides excellent grip and stability, inspiring confidence in various driving conditions. Compared to the six-speed manual M3, the B3 prioritizes comfort and ease of use, making it a more suitable choice for drivers who value refinement over outright performance.
Equipment & Trim Levels
The Alpina B3 3.3i came generously equipped as standard. Interior appointments included sport seats upholstered in Nappa leather, wood trim, and Alpina-specific badging. Standard features also included automatic climate control, a premium sound system, and power-adjustable front seats. Optional extras included a sunroof, navigation system, and upgraded audio options. Alpina offered a range of customization options, allowing buyers to personalize their vehicles to their specific preferences. The interior was designed to provide a luxurious and comfortable environment, reflecting the car’s positioning as a high-end performance sedan.
Chassis & Braking
The B3 3.3i features a reinforced chassis and suspension components to handle the increased power and torque. The front suspension utilizes MacPherson struts, while the rear suspension employs a multi-link setup. Stabilizer bars are fitted to both the front and rear axles to reduce body roll during cornering. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) ensures safe and controlled braking in emergency situations. The suspension tuning strikes a balance between comfort and handling, providing a compliant ride without sacrificing agility.
Market Reception & Comparison
The Alpina B3 3.3i was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and luxurious interior. However, some critics noted that it lacked the raw excitement of the M3. Fuel economy was reasonable for a high-performance sedan, averaging around 20 mpg in combined driving. Compared to the standard 330i, the B3 offered significantly more power and performance, along with a more exclusive and luxurious experience. Compared to the M3, it provided a more comfortable and refined driving experience, albeit with slightly less outright performance. Reliability was generally good, although maintenance costs were higher than those of a standard BMW due to the specialized nature of the Alpina components.
Legacy
The Alpina B3 3.3i (E46) has become a sought-after vehicle among enthusiasts. Its combination of performance, luxury, and exclusivity has made it a collectible car. The engine is known for its durability and reliability, provided it is properly maintained. In the used car market, prices for well-maintained examples have been steadily increasing. The B3 3.3i represents a unique chapter in the E46 3 Series story, offering a compelling alternative to the standard BMW models and a testament to Alpina’s engineering expertise. Its blend of performance and refinement continues to appeal to drivers who appreciate a sophisticated and engaging driving experience.
