The BMW 6 Series Coupe (F13) 650i Steptronic, produced from 2012 to 2015, represented the high-performance end of BMW’s luxurious coupe range. Positioned as the flagship engine option within the F13 generation, it offered a significant step up in power and refinement compared to the 640i models. Built on the F13 platform, which shared underpinnings with the F06 Gran Coupe and F12 Convertible, the 650i aimed to deliver a grand touring experience blending performance, comfort, and sophisticated technology. This variant was primarily marketed towards buyers seeking a powerful, luxurious coupe for long-distance driving and spirited performance.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Coupe (F13) |
| Type (Engine) | 650i (450 Hp) Steptronic |
| Start of production | 2012 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 11.9-12.4 l/100 km (19.8 – 20.3 US mpg) |
| Fuel consumption (extra urban) | 6.6-6.9 l/100 km (35.6 – 34.1 US mpg) |
| Fuel consumption (combined) | 8.6-8.9 l/100 km (27.4 – 26.4 US mpg) |
| CO2 emissions | 199-206 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.6 sec |
| Acceleration 0 – 62 mph | 4.6 sec |
| Acceleration 0 – 60 mph | 4.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 4 kg/Hp |
| Weight-to-torque ratio | 2.8 kg/Nm |
| Power | 450 Hp @ 5500 rpm |
| Torque | 650 Nm @ 2000-4500 rpm (479.42 lb.-ft. @ 2000-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N63B44B |
| 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 | 9 l (9.51 US qt | 7.92 UK qt) |
| Coolant | 10.9 l (11.52 US qt | 9.59 UK qt) |
| Kerb Weight | 1795 kg (3957.3 lbs.) |
| Max. weight | 2290 kg (5048.59 lbs.) |
| Max load | 495 kg (1091.29 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Length | 4894 mm (192.68 in.) |
| Width | 1894 mm (74.57 in.) |
| Height | 1369 mm (53.9 in.) |
| Wheelbase | 2855 mm (112.4 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear (Back) track | 1665 mm (65.55 in.) |
| Ride height (ground clearance) | 124 mm (4.88 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.7 m (38.39 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Double wishbone |
| 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 | 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 |
| Wheel rims size | 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 |
Powertrain & Engine Architecture
The heart of the 650i Steptronic is BMW’s N63B44B engine, a 4.4-liter twin-turbocharged V8. This engine, a significant evolution of the earlier N62 and N63 designs, features direct fuel injection, a valvetrain with Double-VANOS (variable valve timing and lift), and twin scroll turbochargers. The direct injection system delivers fuel directly into the combustion chamber, improving efficiency and responsiveness. The twin-turbo setup provides a broad torque curve and minimizes turbo lag. The engine produces 450 horsepower at 5,500 rpm and a substantial 650 Nm (479 lb-ft) of torque between 2,000 and 4,500 rpm. Paired with the engine is BMW’s 8-speed Steptronic automatic transmission. This transmission offers smooth and quick shifts, and includes features like paddle shifters for manual control. The transmission’s gear ratios are tuned to balance performance and fuel efficiency, with a relatively tall final drive for highway cruising.
Driving Characteristics
The 650i Steptronic delivers a refined yet potent driving experience. The combination of the powerful V8 and the 8-speed automatic results in brisk acceleration – 0 to 60 mph in approximately 4.4 seconds. While not as raw or engaging as a manual transmission, the Steptronic transmission provides seamless gear changes and allows the driver to focus on enjoying the car’s power. The engine’s broad torque band means strong acceleration is available across a wide range of engine speeds. Compared to the 640i models, the 650i offers a noticeably more powerful and responsive driving experience. The 650i’s weight distribution is well-balanced, contributing to confident handling. The suspension is tuned for comfort, but still provides good body control in corners.
Equipment & Trim Levels
The 650i Steptronic came standard with a comprehensive list of features, reflecting its position as the range-topping model. Standard equipment included leather upholstery, power-adjustable heated front seats, a premium sound system, a navigation system, and a sunroof. Optional extras were plentiful, including upgraded leather options, active steering, adaptive suspension, a head-up display, and various driver assistance systems like lane departure warning and blind spot monitoring. Interior trim options included wood, aluminum, and carbon fiber accents. The dashboard layout is driver-focused, with a large central display screen and intuitive controls.
Chassis & Braking
The F13 650i utilizes a double wishbone front suspension and an independent multi-link rear suspension. This setup provides a comfortable ride while maintaining good handling characteristics. The 650i is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and dynamic stability control (DSC) are standard features. The steering is electrically assisted, providing precise and responsive control. The 650i typically came equipped with staggered wheel and tire sizes, with wider tires at the rear to enhance traction.
Market Reception & Comparison
The 650i Steptronic was generally well-received by automotive critics. Reviewers praised its powerful engine, luxurious interior, and refined driving experience. However, some criticized its relatively high price and the complexity of its technology. Compared to the 640i, the 650i offered a significant performance advantage, but at a higher cost. Fuel economy was reasonable for a V8-powered coupe, but not as efficient as the turbocharged four-cylinder or six-cylinder models. Reliability was generally good, but the complex engine and transmission systems could be expensive to repair.
Legacy
The N63B44B engine, while powerful, has been known to require careful maintenance, particularly regarding cooling system components and turbocharger health. Early versions of the engine were prone to oil leaks and cooling system failures, but these issues were largely addressed in later revisions. Today, the F13 650i represents a compelling option for buyers seeking a luxurious and powerful grand tourer. Well-maintained examples command a premium in the used car market. The combination of performance, comfort, and technology continues to make it a desirable vehicle for enthusiasts.
