The BMW M6 Convertible (E64) with the 5.0-liter V10 engine, producing 507 horsepower and paired with the Sequential Manual Gearbox (SMG) transmission, represents a high-performance iteration of BMW’s 6-Series convertible. Produced from 2006 to 2007, this model occupied the pinnacle of the E64 range, offering a blend of open-air motoring and track-capable performance. It was built on the E63/E64 6-Series platform, sharing its chassis and basic structure with the coupe version, but distinguished by its soft-top convertible roof and unique performance characteristics. This variant aimed to deliver a more visceral and engaging driving experience than the standard 6-Series models.
Technical Specifications
| Brand | BMW |
| Model | M6 |
| Generation | M6 Convertible (E64) |
| Type (Engine) | 5.0 V10 (507 Hp) SMG |
| Start of production | 2006 |
| End of production | 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban (NEDC) | 22.8 l/100 km (10.3 US mpg, 12.4 UK mpg, 4.4 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 10.7 l/100 km (22 US mpg, 26.4 UK mpg, 9.3 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 15.2 l/100 km (15.5 US mpg, 18.6 UK mpg, 6.6 km/l) |
| CO2 emissions (NEDC) | 366 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 3.8 kg/Hp, 262.7 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 269.4 Nm/tonne |
| Power | 507 Hp @ 7750 rpm |
| Power per litre | 101.4 Hp/l |
| Torque | 520 Nm @ 6100 rpm (383.53 lb.-ft. @ 6100 rpm) |
| Maximum engine speed | 8250 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | S85B50A |
| Engine displacement | 4999 cm3 (305.06 cu. in.) |
| Number of cylinders | 10 |
| Engine configuration | V-engine |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 75.2 mm (2.96 in.) |
| Compression ratio | 12:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC, Double-VANOS |
| Engine oil capacity | 9.3 l (9.83 US qt | 8.18 UK qt) |
| Coolant | 15 l (15.85 US qt | 13.2 UK qt) |
| Kerb Weight | 1930 kg (4254.92 lbs.) |
| Max. weight | 2380 kg (5247 lbs.) |
| Max load | 450 kg (992.08 lbs.) |
| Trunk (boot) space – minimum | 300 l (10.59 cu. ft.) |
| Trunk (boot) space – maximum | 350 l (12.36 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4871 mm (191.77 in.) |
| Width | 1855 mm (73.03 in.) |
| Width including mirrors | 2043 mm (80.43 in.) |
| Height | 1377 mm (54.21 in.) |
| Wheelbase | 2781 mm (109.49 in.) |
| Front track | 1567 mm (61.69 in.) |
| Rear (Back) track | 1584 mm (62.36 in.) |
| Front overhang | 960 mm (37.8 in.) |
| Rear overhang | 1130 mm (44.49 in.) |
| Minimum turning circle | 12.5 m (41.01 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 7 gears, automatic transmission SMG |
| Front suspension | Spring Strut, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs, 374×36 mm |
| Rear brakes | Ventilated discs, 370×24 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 255/40 ZR19 Rear wheel tires: 285/35 ZR19 |
| Wheel rims size | Front wheel rims: 8.5J x 19 Rear wheel rims: 9.5J x 19 |
INTRODUCTION
The BMW M6 Convertible (E64) 5.0 V10 SMG, produced between 2006 and 2007, represents the high-performance convertible variant of the E63/E64 6-Series. It was positioned as the flagship model, offering a unique combination of luxury, performance, and open-top driving. The E64 M6 shared its underpinnings with the M6 Coupe, but with the added appeal of a retractable soft top. This model aimed to provide a more engaging and driver-focused experience compared to the standard 6-Series convertibles, appealing to enthusiasts seeking a high-performance grand tourer.
Powertrain & Engine Architecture
At the heart of the E64 M6 lies the S85B50A 5.0-liter naturally aspirated V10 engine. This engine, derived from the powerplant used in the E60 M5, is a marvel of engineering, featuring individual throttle bodies for each cylinder and a high 8250 rpm redline. The engine utilizes Double-VANOS (BMW’s variable valve timing system) for both intake and exhaust valves, optimizing performance and efficiency across the rev range. Fuel is delivered via multi-port fuel injection. The engine produces 507 horsepower at 7750 rpm and 383.53 lb-ft of torque at 6100 rpm.
The “SMG” designation refers to the Sequential Manual Gearbox, a seven-speed automated manual transmission. Unlike a traditional automatic, the SMG allows the driver to select gears manually via steering wheel-mounted paddles or automatically in a D (Drive) or S (Sport) mode. The SMG utilizes a single clutch and electro-hydraulic actuation for quick and precise gear changes. While offering faster shifts than a conventional automatic, the SMG was sometimes criticized for its jerky low-speed behavior.
Driving Characteristics
The M6 Convertible’s driving experience is defined by its potent V10 engine and responsive SMG transmission. Acceleration is brisk, with 0-60 mph times around 4.6 seconds. The engine delivers a linear power curve, building strongly throughout the rev range. The SMG transmission, when driven aggressively, provides rapid gear changes, enhancing the sense of speed. However, in everyday driving, the SMG can feel less refined than a traditional automatic, exhibiting some jerkiness during low-speed maneuvers. The convertible top adds weight compared to the coupe, slightly impacting handling, but the M6 still offers impressive cornering ability thanks to its well-tuned suspension and precise steering.
Equipment & Trim Levels
The M6 Convertible came generously equipped as standard. Interior features included leather upholstery, power-adjustable heated seats with memory function, a premium sound system, and automatic climate control. Standard exterior features included 19-inch alloy wheels, Xenon headlights, and a sport exhaust system. Optional extras included carbon fiber interior trim, upgraded leather options, a head-up display, and active suspension. The M6’s interior was focused on providing a luxurious and sporty environment, with a driver-centric layout and high-quality materials.
Chassis & Braking
The E64 M6 utilizes a reinforced chassis compared to the standard 6-Series, enhancing rigidity and handling. The suspension features a multi-link rear setup and a spring strut front suspension, both tuned for performance. Stabilizer bars are fitted front and rear to reduce body roll. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The M6’s braking system is equipped with ABS (Anti-lock Braking System) for enhanced safety.
Market Reception & Comparison
The M6 Convertible was generally well-received by automotive critics, praised for its exhilarating performance and luxurious features. However, the SMG transmission drew some criticism for its lack of smoothness in everyday driving. Compared to the standard 6-Series convertibles, the M6 offered a significant performance upgrade, but at a substantial price premium. Compared to the M6 Coupe, the convertible offered a similar driving experience, albeit with a slight weight penalty and a less rigid chassis. Fuel economy was predictably poor, reflecting the car’s high-performance nature.
Legacy
The BMW M6 Convertible (E64) 5.0 V10 SMG remains a desirable vehicle among enthusiasts. The S85 V10 engine is highly regarded for its unique sound and performance characteristics. While the SMG transmission can require specialized maintenance, the engine itself is generally considered reliable if properly maintained. Today, the E64 M6 commands a strong following in the used car market, appealing to those seeking a high-performance, open-top grand tourer with a distinctive character. Its combination of power, luxury, and exclusivity ensures its place as a memorable and sought-after BMW model.
