The BMW 3 Series Sedan (E46) facelift, produced from 2001 to 2005, represented a significant evolution of BMW’s popular compact executive car. The 320i variant, equipped with the M54B22 2.2-liter inline-six engine and a five-speed Steptronic automatic transmission, occupied a crucial position in the lineup as the entry-level offering for buyers prioritizing refinement and ease of use over outright performance. This configuration aimed to deliver a balance of BMW’s renowned driving dynamics with the convenience of an automatic gearbox, appealing to a broader customer base than the standard manual transmission models.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Sedan (E46, facelift 2001) |
| Type (Engine) | 320i (170 Hp) Steptronic |
| Start of production | 2001 |
| End of production | 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 13.1 l/100 km (18 US mpg, 21.6 UK mpg) |
| Fuel consumption (extra urban) | 7.3 l/100 km (32.2 US mpg, 38.7 UK mpg) |
| Fuel consumption (combined) | 9.4 l/100 km (25 US mpg, 30.1 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.3 sec |
| Acceleration 0 – 62 mph | 9.3 sec |
| Acceleration 0 – 60 mph | 8.8 sec |
| Maximum speed | 223 km/h (138.57 mph) |
| Weight-to-power ratio | 8.2 kg/Hp, 122.3 Hp/tonne |
| Weight-to-torque ratio | 6.6 kg/Nm, 151.1 Nm/tonne |
| Power | 170 Hp @ 6100 rpm |
| Power per litre | 78.3 Hp/l |
| Torque | 210 Nm @ 3500 rpm (154.89 lb.-ft. @ 3500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M54B22 |
| Engine displacement | 2171 cm3 (132.48 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 80 mm (3.15 in.) |
| Piston Stroke | 72 mm (2.83 in.) |
| Compression ratio | 10.8:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 8.4 l (8.88 US qt | 7.39 UK qt) |
| Kerb Weight | 1390 kg (3064.43 lbs.) |
| Max. weight | 1890 kg (4166.74 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 | 4470 mm (175.98 in.) |
| Width | 1740 mm (68.5 in.) |
| Height | 1420 mm (55.91 in.) |
| Wheelbase | 2725 mm (107.28 in.) |
| Front track | 1480 mm (58.27 in.) |
| Rear (Back) track | 1495 mm (58.86 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, automatic transmission |
| Front suspension | Spring Strut |
| 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 | 195/65 R15 |
| Wheel rims size | 6.5J x 15 |
Powertrain & Engine Architecture
The heart of the 320i Steptronic was the M54B22, a 2.2-liter inline-six cylinder engine. This engine was a descendant of BMW’s long-standing tradition of smooth, naturally aspirated six-cylinder powerplants. It featured double overhead camshafts (DOHC), four valves per cylinder, and a multi-port fuel injection system. The M54 engine was known for its relatively simple design, contributing to its reliability. The Steptronic transmission was a five-speed automatic gearbox, offering both fully automatic operation and a manual shift mode (Steptronic) for more driver involvement. This transmission was designed to provide smooth gear changes and enhance the overall driving experience. The engine produced 170 horsepower at 6100 rpm and 210 Nm (155 lb-ft) of torque at 3500 rpm.
Driving Characteristics
The 320i Steptronic offered a comfortable and refined driving experience. While not as sporty as the manual transmission or higher-powered 330i models, it provided adequate performance for everyday driving. The automatic transmission, while smooth, did result in a slight performance deficit compared to the six-speed manual. Acceleration from 0 to 60 mph took approximately 8.8 seconds, and the top speed was 138.57 mph. The Steptronic transmission’s gear ratios were tuned for fuel efficiency and smooth cruising, rather than aggressive acceleration. The engine delivered a linear power delivery, making it easy to modulate throttle response.
Equipment & Trim Levels
The 320i Steptronic typically came standard with features such as air conditioning, power windows, power locks, and an AM/FM stereo. Optional extras included leather upholstery, a sunroof, heated front seats, and a premium sound system. The interior trim was generally conservative, reflecting the car’s positioning as an entry-level luxury sedan. The standard upholstery was cloth, but leather was a popular upgrade. The dashboard layout was typical of the E46, with a clear and functional design.
Chassis & Braking
The E46 320i Steptronic utilized a MacPherson strut front suspension and a multi-link rear suspension, providing a good balance of ride comfort and handling. The braking system consisted of ventilated disc brakes on all four wheels, coupled with an Anti-lock Braking System (ABS). The suspension was tuned to provide a comfortable ride, but still offered decent handling characteristics. The steering was a hydraulic power-assisted rack and pinion system, providing precise and responsive steering feel.
Market Reception & Comparison
The 320i Steptronic was generally well-received by critics as a comfortable and refined entry-level luxury sedan. However, some reviewers noted that the automatic transmission dulled the driving experience compared to the manual version. Fuel economy was respectable, averaging around 25 mpg in combined driving. Compared to the 330i, the 320i offered less power and performance, but it was also more affordable and fuel-efficient. The 320i also differed from diesel variants like the 320d, offering a smoother, quieter engine but with lower torque and fuel economy.
Legacy
The M54B22 engine, when properly maintained, proved to be a reliable powerplant. The Steptronic transmission, while not as robust as some other automatic transmissions, also generally held up well over time. Today, the E46 320i Steptronic remains a popular choice in the used car market, particularly for buyers seeking a comfortable and reliable BMW sedan. Common issues include oil leaks, cooling system failures, and wear and tear on suspension components. However, parts availability is good, and the car’s relatively simple design makes it relatively easy to maintain. The 320i Steptronic represents a sweet spot in the E46 lineup, offering a blend of BMW’s core values – driving pleasure, refinement, and reliability – at an accessible price point.
