2005-2007 BMW 6 Series Convertible (E64) 650i (367 Hp)

The BMW 6 Series Convertible (E64) 650i, produced from 2005 to 2007, represented BMW’s foray into the luxury roadster market with a focus on grand touring capabilities. Positioned as the flagship variant of the E64 generation, it offered a significant step up in performance and refinement compared to the 645Ci. The E64 650i was built on the BMW E63/E64 platform, sharing its underpinnings with the 6 Series Coupe. It aimed to combine open-air driving enjoyment with the power and luxury expected of a BMW grand tourer, competing with vehicles like the Mercedes-Benz SL-Class and Porsche 911 Cabriolet.

Technical Specifications

INTRODUCTION

The 650i variant of the E64 6 Series Convertible debuted in 2005 as the performance leader of the range. It replaced the 645Ci, offering a substantial power increase thanks to its larger engine. The E64 platform, shared with the 6 Series Coupe, was BMW’s attempt to recapture the spirit of the classic BMW coupes of the 1980s, offering a blend of luxury, performance, and open-air driving pleasure. The 650i specifically targeted buyers who desired a powerful and refined grand tourer, capable of both comfortable long-distance cruising and spirited driving. Production continued until 2007, with minor revisions throughout its lifespan.

Powertrain & Engine Architecture

At the heart of the 650i lies the N62B48 engine, a 4.8-liter naturally aspirated V8. This engine is a significant departure from the 4.4-liter V8 found in the preceding 645Ci. The N62B48 features all-aluminum construction, double overhead camshafts (DOHC) with four valves per cylinder, and BMW’s Double-VANOS variable valve timing system for both intake and exhaust. Fuel is delivered via a multi-port fuel injection system. The engine produces 367 horsepower at 6300 rpm and 490 Nm (361 lb-ft) of torque at 3400 rpm. The engine’s architecture prioritizes smooth power delivery and a characteristic V8 sound. The 650i was exclusively offered with a six-speed manual transmission, providing drivers with full control over the engine’s power. The transmission features a robust design and precise shift feel, complementing the engine’s performance characteristics.

Driving Characteristics

The 650i delivers a distinctly grand touring experience. The large displacement V8 provides ample power throughout the rev range, resulting in strong acceleration. The 0-60 mph sprint takes approximately 5.4 seconds, and the car is electronically limited to a top speed of 155 mph. The manual transmission allows for precise gear selection, enhancing driver engagement. While not as nimble as smaller sports cars, the 650i offers a comfortable and composed ride, even on less-than-perfect road surfaces. The weight distribution is relatively balanced, contributing to predictable handling. Compared to the 645Ci, the 650i offers a noticeable increase in performance, particularly in mid-range acceleration. The manual transmission, while engaging, requires more driver involvement than the automatic transmissions offered in other 6 Series variants.

Equipment & Trim Levels

The 650i came standard with a comprehensive list of luxury features. Interior appointments included leather upholstery, power-adjustable heated seats, a premium sound system, and automatic climate control. Standard exterior features included 18-inch alloy wheels, xenon headlights, and a power-operated soft top. Optional extras included upgraded leather trim, a navigation system, active steering, and sport seats. The interior design emphasized luxury and comfort, with a focus on high-quality materials and craftsmanship. The dashboard layout is driver-focused, with intuitive controls and clear instrumentation.

Chassis & Braking

The E64 650i utilizes a sophisticated chassis design. The front suspension features a McPherson strut setup with coil springs and an anti-roll bar, while the rear suspension employs a multi-link design with coil springs. This configuration provides a good balance between ride comfort and handling precision. The braking system consists of ventilated disc brakes on all four wheels, coupled with ABS (Anti-lock Braking System) and Dynamic Stability Control (DSC). The braking performance is strong and consistent, providing ample stopping power. The steering is a hydraulic rack-and-pinion system, offering precise and responsive steering feel.

Market Reception & Comparison

The 650i was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and refined driving experience. However, some critics noted the car’s relatively high price and complex electronics. Compared to the 645Ci, the 650i offered a significant performance upgrade, but at a higher cost. The 650i’s fuel economy was also lower than that of the 645Ci, reflecting the larger engine’s increased fuel consumption. Reliability was a concern for some owners, with reports of issues related to the cooling system and electronic components. However, many owners reported years of trouble-free ownership with proper maintenance.

Legacy

The E64 650i remains a desirable grand tourer in the used car market. Its powerful V8 engine and luxurious interior continue to appeal to enthusiasts. The N62B48 engine, while known for some potential maintenance issues (such as coolant hose failures and oil leaks), is generally considered a robust and reliable powerplant when properly maintained. Parts availability is good, and a thriving aftermarket supports the E64 platform. The 650i represents a high point in BMW’s grand touring heritage, offering a unique blend of performance, luxury, and open-air driving enjoyment. Values have remained relatively stable, making it an attractive option for those seeking a classic BMW experience.