The BMW X6 (E71) 50i xDrive Steptronic, produced from 2010 to 2012, represents a high-performance variant within the first generation of BMW’s controversial yet successful Sports Activity Coupe (SAC). Positioned as the flagship engine option for the E71 X6, the 50i combined a potent twin-turbocharged V8 engine with BMW’s xDrive all-wheel-drive system and an eight-speed Steptronic automatic transmission. This model aimed to deliver both luxurious comfort and impressive performance, appealing to buyers seeking a unique and capable SUV. It occupied the premium segment of the X6 lineup, significantly more expensive and powerful than the 35i and 30d models.
Technical Specifications
| Brand | BMW |
| Model | X6 |
| Generation | X6 (E71) |
| Type (Engine) | 50i (407 Hp) xDrive Steptronic |
| Start of production | 2010 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 4 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 17.7 l/100 km (13.3 US mpg, 16 UK mpg, 5.6 km/l) |
| Fuel consumption (economy) – extra urban | 9.6 l/100 km (24.5 US mpg, 29.4 UK mpg, 10.4 km/l) |
| Fuel consumption (economy) – combined | 12.5 l/100 km (18.8 US mpg, 22.6 UK mpg, 8 km/l) |
| CO2 emissions | 292 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.4 sec |
| Acceleration 0 – 62 mph | 5.4 sec |
| Acceleration 0 – 60 mph | 5.1 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.4 kg/Hp, 185.8 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 274 Nm/tonne |
| Power | 407 Hp @ 5500-6400 rpm |
| Power per litre | 92.6 Hp/l |
| Torque | 600 Nm @ 1750-4500 rpm (442.54 lb.-ft. @ 1750-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N63B44 |
| Engine displacement | 4395 cm3 (268.2 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 17.2 l (18.18 US qt | 15.13 UK qt) |
| Kerb Weight | 2190 kg (4828.12 lbs.) |
| Max. weight | 2790 kg (6150.9 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space – minimum | 570 l (20.13 cu. ft.) |
| Trunk (boot) space – maximum | 1450 l (51.21 cu. ft.) |
| Fuel tank capacity | 85 l (22.45 US gal | 18.7 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2700 kg (5952.48 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 120 kg (264.55 lbs.) |
| Length | 4877 mm (192.01 in.) |
| Width | 1983 mm (78.07 in.) |
| Height | 1690 mm (66.54 in.) |
| Wheelbase | 2933 mm (115.47 in.) |
| Front track | 1644 mm (64.72 in.) |
| Rear (Back) track | 1706 mm (67.17 in.) |
| Ride height (ground clearance) | 212 mm (8.35 in.) |
| Drag coefficient (Cd) | 0.36 |
| Minimum turning circle (turning diameter) | 12.8 m (41.99 ft.) |
| Approach angle | 25.1° |
| Departure angle | 25.5° |
| Ramp-over (brakeover) angle | 19.1° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Independent multi-link suspension |
| 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 |
| Tires size | 255/50 R19 |
| Wheel rims size | 9J x 19 |
Powertrain & Engine Architecture
The heart of the X6 50i is the N63B44 engine, a 4.4-liter twin-turbocharged V8. This engine represented a significant advancement in BMW’s powertrain technology. It featured direct fuel injection, allowing for precise fuel delivery and improved combustion efficiency. The twin-turbocharger setup, utilizing two small turbochargers, minimized turbo lag and provided a broad, flat torque curve. The engine produced 407 horsepower at 5,500-6,400 rpm and a substantial 600 Nm (442 lb-ft) of torque between 1,750 and 4,500 rpm. This power was channeled through BMW’s eight-speed Steptronic automatic transmission, known for its smooth and quick shifts. The transmission offered both automatic and manual shift modes, allowing drivers to tailor the driving experience to their preferences. The xDrive all-wheel-drive system intelligently distributed power between the front and rear axles, enhancing traction and stability in various driving conditions.
Driving Characteristics
The X6 50i delivered a compelling blend of performance and comfort. The twin-turbo V8 provided effortless acceleration, with a 0-60 mph time of around 5.1 seconds. The eight-speed automatic transmission contributed to this performance by keeping the engine in its optimal power band. Compared to the X6 35i, the 50i offered significantly more power and torque, resulting in a more responsive and engaging driving experience. While the 35i focused on efficiency, the 50i prioritized performance. The xDrive system provided excellent grip and stability, particularly in inclement weather. However, the X6’s considerable weight (approximately 4,828 lbs) was noticeable, especially during spirited driving. The steering was precise but lacked some of the feedback found in more focused sports cars.
Equipment & Trim Levels
The X6 50i came standard with a comprehensive list of features, reflecting its premium positioning. Standard equipment included leather upholstery, power-adjustable front seats with memory function, a premium sound system, a navigation system, and automatic climate control. Optional extras included adaptive cruise control, a head-up display, ventilated front seats, and a rear-seat entertainment system. The interior design was luxurious and well-appointed, with high-quality materials and a driver-focused layout. Trim levels were relatively simple, with most customization options available through individual selections rather than distinct packages.
Chassis & Braking
The X6 50i featured an independent multi-link suspension at both the front and rear, providing a comfortable ride and good handling characteristics. The suspension was tuned to balance comfort and performance, offering a compliant ride over most road surfaces. The braking system consisted of ventilated discs at all four corners, providing ample stopping power. The ABS (Anti-lock Braking System) and stability control systems further enhanced safety. Due to the vehicle’s weight, the brakes were often upgraded with larger rotors and more aggressive pads by enthusiasts.
Market Reception & Comparison
The X6 50i received generally positive reviews from automotive critics. It was praised for its powerful engine, luxurious interior, and capable all-wheel-drive system. However, some critics questioned the X6’s styling and its relatively high price. Compared to other performance SUVs of the time, such as the Porsche Cayenne Turbo, the X6 50i offered a compelling value proposition, providing similar performance at a lower price point. Fuel economy was a concern, with combined fuel consumption averaging around 18.8 US mpg. Reliability was generally good, although some owners reported issues with the turbochargers and fuel injectors.
Legacy
The BMW X6 (E71) 50i xDrive Steptronic remains a desirable vehicle in the used car market. The N63B44 engine, while complex, is generally considered robust when properly maintained. Regular oil changes and timely maintenance of the cooling system are crucial to prevent potential issues. The X6 50i’s unique combination of performance, luxury, and practicality has ensured its continued appeal to enthusiasts and buyers seeking a distinctive SUV. While newer generations of the X6 have surpassed it in terms of technology and efficiency, the E71 50i remains a significant milestone in BMW’s history, representing a bold and innovative approach to the SUV segment.
