The BMW 3 Series Sedan (E90) 330i Steptronic, produced from 2005 to 2007, represented a significant evolution in BMW’s long-standing tradition of sporty, executive sedans. Positioned as a mid-range offering within the E90 generation, it bridged the gap between the entry-level 325i and the performance-focused 335i. The 330i aimed to deliver a balanced driving experience, combining respectable power with the convenience of an automatic transmission. It was a key model for BMW in the North American market, where automatics were – and continue to be – highly preferred by a large segment of buyers.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Sedan (E90) |
| Type (Engine) | 330i (258 Hp) Steptronic |
| Start of production | 2005 |
| End of production | 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 12.9 l/100 km (18.2 US mpg, 21.9 UK mpg, 7.8 km/l) |
| Fuel consumption (economy) – extra urban | 6.8 l/100 km (34.6 US mpg, 41.5 UK mpg, 14.7 km/l) |
| Fuel consumption (economy) – combined | 9 l/100 km (26.1 US mpg, 31.4 UK mpg, 11.1 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.6 sec |
| Acceleration 0 – 62 mph | 6.6 sec |
| Acceleration 0 – 60 mph | 6.3 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 5.9 kg/Hp, 169.2 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 196.7 Nm/tonne |
| Power | 258 Hp @ 6600 rpm |
| Power per litre | 86.1 Hp/l |
| Torque | 300 Nm @ 2500 rpm (221.27 lb.-ft. @ 2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N52B30A |
| Engine displacement | 2996 cm3 (182.83 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 85 mm (3.35 in.) |
| Piston Stroke | 88 mm (3.46 in.) |
| Compression ratio | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| 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 | 1525 kg (3362.05 lbs.) |
| Max. weight | 1970 kg (4343.11 lbs.) |
| Max load | 445 kg (981.06 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Length | 4520 mm (177.95 in.) |
| Width | 1817 mm (71.54 in.) |
| Height | 1421 mm (55.94 in.) |
| Wheelbase | 2760 mm (108.66 in.) |
| Front track | 1500 mm (59.06 in.) |
| Rear (Back) track | 1513 mm (59.57 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Spring Strut |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 225/45 R17 W |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
The heart of the 330i Steptronic was the N52B30A, a 3.0-liter inline-six cylinder engine. This engine was a significant departure from its predecessor, the M54, incorporating numerous advancements in engine design. The N52 featured a magnesium alloy engine block, double VANOS (variable valve timing for both intake and exhaust camshafts), and a more efficient combustion chamber design. Fuel delivery was handled by a multi-port fuel injection system, providing precise fuel metering for optimal performance and emissions. The engine produced 258 horsepower at 6600 rpm and 221 lb-ft of torque at 2500 rpm.
The “Steptronic” designation refers to BMW’s 6-speed automatic transmission. This transmission wasn’t a traditional torque-converter automatic; it featured a lock-up torque converter and the ability for the driver to manually shift gears via steering wheel-mounted paddles or the gear selector. The transmission was programmed for smooth shifts and optimized for both fuel efficiency and responsive acceleration. The gear ratios were tuned to provide a balance between everyday drivability and the ability to exploit the engine’s power.
Driving Characteristics
The 330i Automatic offered a refined and comfortable driving experience. While not as overtly sporty as the 6-speed manual version, the automatic transmission provided smooth and effortless acceleration. The 0-60 mph time of around 6.3 seconds was respectable for the era. The automatic transmission’s programming prioritized comfort over outright performance, resulting in slightly slower shifts compared to the manual. However, the Steptronic’s manual shift mode allowed drivers to take more control when desired. The inline-six engine delivered a smooth and linear power delivery, making it easy to modulate throttle inputs and maintain control in various driving conditions. Compared to the higher-output 335i (which featured a turbocharged engine), the 330i felt less urgent but more predictable and accessible.
Equipment & Trim Levels
The 330i Steptronic typically came standard with a generous array of features, including leatherette upholstery, automatic climate control, power windows and locks, and a premium sound system. Optional extras were plentiful, allowing buyers to customize their vehicles to their preferences. Popular options included sport seats, a sunroof, navigation system, and upgraded audio systems. Interior trim options ranged from wood veneers to aluminum accents. The standard dashboard configuration featured analog gauges with a central information display, providing information on vehicle speed, engine rpm, fuel level, and other vital parameters.
Chassis & Braking
The E90 330i utilized a MacPherson strut front suspension and a multi-link rear suspension, providing a comfortable ride and precise handling. The suspension was tuned to balance ride comfort with sporty handling characteristics. Braking duties were handled by ventilated disc brakes at the front and solid disc brakes at the rear. Anti-lock braking system (ABS) was standard, enhancing braking performance and stability. The chassis was designed to be rigid and lightweight, contributing to the car’s overall handling prowess.
Market Reception & Comparison
The 330i Steptronic was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and well-appointed interior. However, some critics noted that the automatic transmission lacked the engagement of the manual gearbox. Compared to the 325i, the 330i offered a noticeable performance upgrade. Compared to the 335i, it provided a more affordable entry point into the 3 Series range, albeit with less power. Fuel economy was reasonable for a vehicle in its class, averaging around 26 mpg in combined driving.
Legacy
The N52B30A engine and the 6-speed Steptronic transmission have proven to be relatively reliable powertrains. While some maintenance items, such as the water pump and thermostat housing, are known to be potential failure points, these issues are generally well-documented and relatively inexpensive to address. Today, the E90 330i Steptronic represents a compelling value in the used car market. It offers a blend of performance, luxury, and reliability that continues to appeal to enthusiasts and everyday drivers alike. Its status as a well-engineered and enjoyable driving machine ensures its continued presence on roads for years to come.
