The 2009 BMW 750Li represents a pinnacle of automotive engineering, combining a commanding road presence with a level of refined performance that defines the upper echelon of the luxury sedan segment. For enthusiasts and discerning buyers alike, understanding the mechanical symphony beneath the hood is paramount, and the 750Li's powertrain is the very heart of its appeal.
The Heart of the Beast: S63 TwinPower Turbo V8
At the core of the 2009 750Li lies the legendary BMW S63 4.4-liter twin-turbocharged V8 engine. This powerplant was a technological tour de force for its time, utilizing two turbochargers— one low-pressure and one high-pressure—to deliver an immediate and linear surge of power across the entire rev range. This sophisticated forced induction system effectively eliminated turbo lag, a common complaint in earlier turbocharged BMWs, ensuring that the immense potential was available at the slightest touch of the throttle.
Horsepower and Torque Figures
The engineering team meticulously calibrated this beast to produce a formidable 500 horsepower (SAE net) and an equally impressive 455 lb-ft of torque. This output was not merely a number on a spec sheet; it was a promise of effortless acceleration and a thrilling driving experience. The substantial torque figure, available from a remarkably low 1,500 rpm, ensured that the 750Li could surge forward with authority, making overtaking and highway merging confident and decisive endeavors.
Performance Dynamics and Efficiency
Translating this raw power into real-world performance was the job of the 6-speed Steptronic automatic transmission. This unit was a marvel of its time, featuring intelligent shift programs and a Drivelogic mode that allowed the driver to hold gears for maximum engine braking or force earlier upshifts for improved fuel economy. Despite its powerhouse nature, the 750Li managed a respectable combined fuel economy of around 18-19 MPG, a testament to the efficiency of its direct injection and valvetronic technologies when paired with the automatic stop-start system.
0-60 and the Driving Experience
The culmination of this engineering is best understood through its performance metrics. The 2009 750Li could sprint from 0 to 60 mph in approximately 4.8 to 5.0 seconds, a figure that was class-leading for the period. This acceleration is not the harsh, jarring kind found in sports cars, but a smooth, relentless surge characteristic of a grand tourer. Whether navigating city streets or carving on an open highway, the S63 engine delivered a driving experience that was both refined and exhilarating.
Engineering Excellence and Legacy
It is crucial to distinguish the 2009 model year as a significant point in the 7-Series' evolution. This was the final year for the E65/E66 generation before the revolutionary new F01 generation arrived. The 2009 750Li, therefore, represented the ultimate evolution of the large, rear-wheel-drive luxury sedan with its aging but superbly executed hydraulic suspension and available air suspension. Its powertrain set the benchmark that competitors would spend years trying to match.
Specifications at a Glance
For the data-driven enthusiast, the technical specifications of the 2009 BMW 750Li's powertrain provide a clear picture of its capabilities. The following table outlines the key metrics that define its performance character:
| Specification | Detail |
|---|---|
| Engine Code | S63 |
| Configuration | 4.4L V8, Twin-Turbocharged |
| Horsepower | 500 hp @ 5,500 rpm |
| Torque | 455 lb-ft @ 1,500 - 4,250 rpm |
| Drivetrain | Rear-Wheel Drive (xDrive AWD optional) |
| Transmission | 6-Speed Steptronic Automatic |
