The BMW 335i xDrive Steptronic, part of the E90 LCI (Life Cycle Impulse) generation of the 3 Series sedan, represents a significant iteration of BMW’s popular sports sedan. Produced from 2010 to 2012, this variant combined a potent turbocharged inline-six engine with BMW’s xDrive all-wheel-drive system and a six-speed automatic transmission. The E90 LCI, a facelift of the E90, brought revised styling, updated technology, and refined engine options, solidifying the 3 Series’ position as a benchmark in the entry-level luxury sport sedan segment in North America and globally. The 335i xDrive Steptronic occupied a premium position within the E90 lineup, offering a blend of performance, all-weather capability, and relative comfort.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Sedan (E90 LCI, facelift 2008) |
| Type | 335i (306 Hp) xDrive Steptronic |
| Start of production | 2010 |
| End of production | 2012 |
| 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, 7.6 km/l) |
| Fuel consumption (extra urban) | 6.8 l/100 km (34.6 US mpg, 41.5 UK mpg, 14.7 km/l) |
| Fuel consumption (combined) | 9.1 l/100 km (25.8 US mpg, 31 UK mpg, 11 km/l) |
| CO2 emissions | 212 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.5 sec |
| Acceleration 0 – 62 mph | 5.5 sec |
| Acceleration 0 – 60 mph | 5.2 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.3 kg/Hp, 187.7 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 245.4 Nm/tonne |
| Power | 306 Hp @ 5800 rpm |
| Power per litre | 102.7 Hp/l |
| Torque | 400 Nm @ 1200-5000 rpm (295.02 lb.-ft. @ 1200-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N55B30A |
| Engine displacement | 2979 cm3 (181.79 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 89.6 mm (3.53 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Kerb Weight | 1630 kg (3593.53 lbs.) |
| Max. weight | 2150 kg (4739.94 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 450 l (15.89 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4531 mm (178.39 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 | 1529 mm (60.2 in.) |
| Ride height (ground clearance) | 140 mm (5.51 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle (turning diameter) | 11.8 m (38.71 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Independent coil spring |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/45 R17 91W |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
The heart of the 335i xDrive Steptronic is the N55B30A, a 3.0-liter inline-six engine. This engine is a direct descendant of the N54, but with significant improvements in reliability and thermal management. The N55 utilizes direct fuel injection, a twin-scroll turbocharger, and variable valve timing (Double-VANOS) and variable valve lift (Valvetronic) to deliver a broad torque curve and impressive power output. The engine produces 306 horsepower at 5800 rpm and 400 Nm (295 lb-ft) of torque available from a low 1200 rpm all the way to 5000 rpm. This broad torque band, combined with the six-speed automatic transmission (specifically the 6F24/6F32 series), provides strong acceleration in everyday driving situations. The automatic transmission features Sport and Manual shift modes, allowing drivers to tailor the driving experience. The xDrive all-wheel-drive system intelligently distributes power between the front and rear axles, enhancing traction and stability, particularly in inclement weather.
Driving Characteristics
The 335i xDrive Steptronic offers a compelling blend of performance and usability. While not as raw or engaging as a 335i with a manual transmission, the automatic provides smooth and relatively quick shifts. The xDrive system contributes to confident handling, especially on slippery surfaces. Acceleration from 0-60 mph takes approximately 5.2 seconds, making it a quick car by any standard. The automatic transmission’s gear ratios are tuned for a balance between acceleration and fuel efficiency. Compared to the 328i, the 335i offers significantly more power and torque, resulting in a more exhilarating driving experience. However, it doesn’t quite match the outright performance of the 335is, which featured a more aggressive tune and slightly higher output.
Equipment & Trim Levels
The 335i xDrive Steptronic typically came well-equipped as standard. Features included leatherette upholstery, power-adjustable front seats, a premium sound system, automatic climate control, and BMW’s iDrive infotainment system. Optional extras were plentiful, including sport seats, navigation, a sunroof, and upgraded interior trim. The xDrive models often included additional features related to all-wheel-drive functionality, such as dynamic traction control and hill descent control. The overall interior ambiance was one of understated luxury, with a focus on driver ergonomics and build quality.
Chassis & Braking
The E90 LCI 335i xDrive Steptronic features a sophisticated chassis design. The front suspension utilizes MacPherson struts, while the rear employs a multi-link setup. This configuration provides a good balance between ride comfort and handling precision. The xDrive system adds weight compared to rear-wheel-drive models, necessitating slightly stiffer spring rates and dampers. Braking duties are handled by ventilated discs at all four corners, providing ample stopping power. ABS, dynamic stability control (DSC), and traction control are standard safety features.
Market Reception & Comparison
The 335i xDrive Steptronic was generally well-received by automotive critics. It was praised for its powerful engine, refined handling, and all-weather capability. However, some reviewers noted that the automatic transmission could feel slightly less responsive than the manual. Compared to the 328i, the 335i offered a significant performance upgrade, but at a higher price point. The 335d (diesel) offered comparable torque but a different driving character. Fuel economy was respectable for a performance sedan, averaging around 25.8 US mpg in combined driving.
Legacy
The N55 engine, found in the 335i xDrive Steptronic, has proven to be a relatively reliable powerplant when properly maintained. Common issues include oil leaks, fuel injector failures, and occasional turbocharger problems. However, these issues are generally well-documented and can be addressed with preventative maintenance. Today, the E90 335i xDrive Steptronic represents a compelling value in the used car market, offering a blend of performance, luxury, and all-weather capability at an affordable price. It remains a popular choice for enthusiasts seeking a capable and engaging sports sedan.
