The Alpina B3 Touring (E46), specifically the 3.3 i 24V Switchtronic Allrad variant producing 280 horsepower, represents a unique blend of high performance and practicality. Produced between 2001 and 2006, this model occupied a niche position within the E46 generation, bridging the gap between the standard BMW 3 Series Touring and the more overtly sporting Alpina B3 Coupé. It was designed to offer enthusiasts a high-performance wagon capable of everyday use, appealing to those who desired both speed and space. The “Switchtronic” designation refers to the automatic transmission with manual shift capability, while “Allrad” signifies the all-wheel-drive system.
Technical Specifications
| Brand | Alpina |
| Model | B3 |
| Generation | B3 Touring (E46) |
| Type (Engine) | 3.3 i 24V Switchtronic Allrad (280 Hp) |
| Start of production | 2001 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 17.3 l/100 km (13.6 US mpg / 16.3 UK mpg / 5.8 km/l) |
| Fuel consumption (extra urban) | 8.5 l/100 km (27.7 US mpg / 33.2 UK mpg / 11.8 km/l) |
| Fuel consumption (combined) | 11.7 l/100 km (20.1 US mpg / 24.1 UK mpg / 8.5 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.2 sec |
| Acceleration 0 – 62 mph | 7.2 sec |
| Acceleration 0 – 60 mph | 6.8 sec |
| Maximum speed | 252 km/h (156.59 mph) |
| Weight-to-power ratio | 5.8 kg/Hp, 171.8 Hp/tonne |
| Weight-to-torque ratio | 4.9 kg/Nm, 205.5 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 | 1630 kg (3593.53 lbs.) |
| Max. weight | 2130 kg (4695.85 lbs.) |
| Max load | 500 kg (1102.31 lbs.) |
| Trunk (boot) space – minimum | 435 l (15.36 cu. ft.) |
| Trunk (boot) space – maximum | 1345 l (47.5 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| Length | 4478 mm (176.3 in.) |
| Width | 1739 mm (68.46 in.) |
| Height | 1409 mm (55.47 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 Touring lies the Alpina-modified version of the BMW M3’s S54 inline-six engine, although detuned for greater usability. While the M3’s engine produced 330 horsepower, Alpina reduced this to 280 hp, focusing on increasing torque across a broader rev range. The engine code is closely related to the BMW S54, but with unique Alpina modifications. It features individual throttle bodies, a high-compression ratio of 10.2:1, and a sophisticated double-VANOS variable valve timing system. Fuel is delivered via multi-port fuel injection. The engine’s character is distinctly different from the more peaky M3 engine, offering a smoother, more linear power delivery. The “Switchtronic” automatic transmission is a five-speed unit with the ability to manually select gears, providing a degree of driver involvement. The all-wheel-drive system utilizes a viscous coupling to distribute power between the front and rear axles, enhancing traction in all weather conditions.
Driving Characteristics
The B3 Touring 3.3i Automatic delivers a refined and capable driving experience. While not as brutally fast as the M3, it offers ample performance for spirited driving. The automatic transmission, while not as responsive as a dual-clutch system, provides smooth and predictable shifts. The all-wheel-drive system inspires confidence, particularly on slippery surfaces. The gear ratios are tuned for a balance of acceleration and fuel efficiency. Compared to the standard 3 Series Touring, the B3 offers significantly improved acceleration and handling. Against the manual transmission versions of the B3, the automatic sacrifices some driver engagement but gains in everyday usability. The torque-rich engine makes it easy to accelerate from low speeds, and the all-wheel-drive system provides excellent stability.
Equipment & Trim Levels
The B3 Touring was typically well-equipped, reflecting its premium positioning. Standard features included leather upholstery, heated front seats, automatic climate control, and a high-end audio system. Alpina-specific touches, such as unique interior trim pieces and badging, further distinguished it from the standard 3 Series. Optional extras included a sunroof, navigation system, and upgraded audio options. The interior generally featured a dark wood trim, and the Alpina gauge cluster with blue illumination. The exterior was subtly enhanced with Alpina-specific aerodynamic components, including a front spoiler and rear spoiler.
Chassis & Braking
The B3 Touring’s chassis was subtly modified from the standard 3 Series to improve handling and ride comfort. Alpina utilized stiffer springs and dampers, along with thicker stabilizer bars. The braking system featured ventilated discs at all four corners, providing ample stopping power. The all-wheel-drive system contributes to improved stability under braking. The suspension setup strikes a good balance between sporty handling and comfortable ride quality.
Market Reception & Comparison
The Alpina B3 Touring was generally well-received by automotive critics, who praised its blend of performance, practicality, and refinement. It was seen as a compelling alternative to the standard BMW 3 Series Touring and the more focused M3. Fuel economy, while not exceptional, was reasonable for a high-performance wagon. Reliability was generally good, although the complex engine and transmission required regular maintenance. Compared to the 330i Touring, the B3 offered a significant performance upgrade. Against the M3 Touring (which was not officially offered by BMW), the B3 provided a more comfortable and usable driving experience, albeit with slightly less outright performance.
Legacy
The Alpina B3 Touring (E46) has become a sought-after vehicle among enthusiasts. Its combination of rarity, performance, and practicality has made it a desirable classic. The 3.3i engine is known for its durability, although regular maintenance is essential. Today, well-maintained examples command a premium in the used car market. The Switchtronic automatic transmission, while not as popular as the manual, is generally reliable. The B3 Touring represents a unique chapter in Alpina’s history, showcasing the company’s ability to create high-performance vehicles that are both exciting to drive and practical for everyday use.
