The Alpina B3 Coupe (E46) 3.3i 24V, produced between 1999 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), the B3 was not a mere tuning exercise, but a comprehensively engineered vehicle designed to offer a more luxurious and potent grand touring experience than the standard BMW offerings. Positioned above the 330Ci in terms of performance and exclusivity, the B3 Coupe catered to buyers seeking a sophisticated, high-performance coupe with a distinct character. It was always a relatively low-volume model, adding to its collectibility today.
Technical Specifications
| Brand | Alpina |
| Model | B3 |
| Generation | B3 Coupe (E46) |
| Type (Engine) | 3.3 i 24V (280 Hp) |
| Start of production | 1999 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 2 |
| Fuel consumption (urban) | 16.1 l/100 km (14.6 US mpg, 17.5 UK mpg, 6.2 km/l) |
| Fuel consumption (extra urban) | 7.7 l/100 km (30.5 US mpg, 36.7 UK mpg, 13 km/l) |
| Fuel consumption (combined) | 10.8 l/100 km (21.8 US mpg, 26.2 UK mpg, 9.3 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.7 sec |
| Acceleration 0 – 62 mph | 5.7 sec |
| Acceleration 0 – 60 mph | 5.4 sec |
| Maximum speed | 267 km/h (165.91 mph) |
| Weight-to-power ratio | 5.2 kg/Hp, 193.1 Hp/tonne |
| Weight-to-torque ratio | 4.3 kg/Nm, 231 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 | 1450 kg (3196.7 lbs.) |
| Max. weight | 1950 kg (4299.01 lbs.) |
| Max load | 500 kg (1102.31 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 | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, manual 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 R18; 255/35 ZR18 |
INTRODUCTION
The Alpina B3 Coupe (E46) 3.3i 24V, built from 1999 to 2006, was a limited-production, high-performance coupe based on the BMW E46 platform. Alpina, a renowned German automotive engineering company, took the standard 3 Series coupe and significantly upgraded nearly every aspect of the vehicle. Unlike BMW’s M3, which focused on track performance, the B3 aimed for a more refined and usable blend of power, luxury, and everyday drivability. The “B3” designation signifies Alpina’s entry-level model, but even in its base form, it offered a substantial performance increase over the standard 3 Series coupes.
Powertrain & Engine Architecture
At the heart of the B3 Coupe lies the Alpina’s modified version of BMW’s M54 inline-six engine, displacing 3.3 liters. While visually similar to the BMW unit, the Alpina engine (often referred to by its internal code, though less commonly publicized than BMW’s) featured a host of upgrades. These included high-compression pistons, a re-profiled camshaft, a lightweight flywheel, and a stainless steel exhaust system. The engine utilized a Bosch Motronic MS5.2 engine management system, recalibrated by Alpina to optimize performance and drivability. Fuel delivery was handled by a multi-port fuel injection system. The 24-valve DOHC (Double Overhead Camshaft) valvetrain ensured efficient cylinder filling and exhaust scavenging. The B3 Coupe was exclusively offered with a six-speed manual transmission, providing precise gear changes and enhancing the driving experience. Alpina did not offer an automatic transmission option for this model.
Driving Characteristics
The 280 horsepower and 247 lb-ft of torque produced by the 3.3-liter engine translated into impressive performance. Acceleration from 0 to 60 mph took approximately 5.4 seconds, and the B3 could reach a top speed of 166 mph. The manual transmission’s gear ratios were carefully chosen to provide strong acceleration in all gears, while still maintaining comfortable cruising speeds. Compared to the standard 330Ci, the B3 offered noticeably more power and torque throughout the rev range. The B3’s suspension, while based on the E46 platform, was tuned by Alpina for a balance between sporty handling and ride comfort. It felt more composed and planted than a standard 3 Series, particularly at higher speeds. The steering was precise and well-weighted, providing excellent feedback to the driver.
Equipment & Trim Levels
The B3 Coupe was exceptionally well-equipped, even by premium standards. Standard features included leather upholstery, sport seats, automatic climate control, a premium sound system, and Alpina-specific interior trim. Exterior features included Alpina’s signature front spoiler, rear spoiler, and unique alloy wheels. Optional extras included a sunroof, navigation system, and upgraded audio options. Alpina offered a degree of customization, allowing buyers to specify interior colors and trim materials to their preferences. The interior was designed to be a luxurious and comfortable space, with a focus on high-quality materials and craftsmanship.
Chassis & Braking
The B3 Coupe retained the E46’s MacPherson strut front suspension and multi-link rear suspension, but with Alpina-specific modifications. These included stiffer springs, revised dampers, and thicker stabilizer bars. These changes reduced body roll and improved handling precision. The braking system consisted of ventilated discs at all four corners, providing ample stopping power. ABS (Anti-lock Braking System) was standard. The suspension setup was designed to provide a comfortable ride while still delivering confident handling on winding roads.
Market Reception & Comparison
The Alpina B3 Coupe was generally well-received by automotive critics. Reviewers 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 usable driving experience. Compared to the M3, the B3 was generally considered to be less focused on outright track performance, but more suitable for everyday driving and long-distance touring. Fuel economy was reasonable for a high-performance coupe, averaging around 22 mpg in combined driving. Reliability was generally good, although maintenance costs were higher than those of a standard 3 Series due to the specialized nature of the Alpina components.
Legacy
The Alpina B3 Coupe (E46) remains a sought-after vehicle among enthusiasts. Its limited production numbers and unique character have made it a collectible car. The 3.3-liter engine is known for its durability and responsiveness, and the six-speed manual transmission is highly regarded. While maintenance can be more expensive than for a standard E46, the B3’s build quality and engineering ensure that it can provide many years of reliable service. In the used car market, well-maintained examples command a premium price, reflecting their rarity and desirability. The B3 Coupe represents a high point in Alpina’s history, showcasing the company’s ability to create truly special and engaging automobiles.
