Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (F57) |
| Type (Engine) | Cooper D 1.5 (116 Hp) |
| Start of production | 2016 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 4.5-4.4 l/100 km (52.3 – 53.5 US mpg) |
| Fuel consumption (extra urban) | 3.7-3.5 l/100 km (63.6 – 67.2 US mpg) |
| Fuel consumption (combined) | 4.0-3.8 l/100 km (58.8 – 61.9 US mpg) |
| CO2 emissions | 105-100 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 9.9 sec |
| Acceleration 0 – 62 mph | 9.9 sec |
| Acceleration 0 – 60 mph | 9.4 sec |
| Maximum speed | 195 km/h (121.17 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 10.1 kg/Hp |
| Weight-to-torque ratio | 4.3 kg/Nm |
| Power | 116 Hp @ 4000 rpm |
| Torque | 270 Nm @ 1750-2250 rpm (199.14 lb.-ft. @ 1750-2250 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B37C15A |
| Engine displacement | 1496 cm3 (91.29 cu. in.) |
| Number of cylinders | 3 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 4.4 l (4.65 US qt | 3.87 UK qt) |
| Coolant | 3.3 l (3.49 US qt | 2.9 UK qt) |
| Kerb Weight | 1170 kg (2579.41 lbs.) |
| Max. weight | 1710 kg (3769.9 lbs.) |
| Max load | 540 kg (1190.5 lbs.) |
| Trunk (boot) space – minimum | 160 l (5.65 cu. ft.) |
| Trunk (boot) space – maximum | 215 l (7.59 cu. ft.) |
| Fuel tank capacity | 44 l (11.62 US gal | 9.68 UK gal) |
| Length | 3821 mm (150.43 in.) |
| Width | 1727 mm (67.99 in.) |
| Height | 1415 mm (55.71 in.) |
| Wheelbase | 2495 mm (98.23 in.) |
| Front track | 1501 mm (59.09 in.) |
| Rear (Back) track | 1501 mm (59.09 in.) |
| Ride height (ground clearance) | 115 mm (4.53 in.) |
| Drag coefficient (Cd) | 0.33 |
| Minimum turning circle | 10.8 m (35.43 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 6 |
| Gearbox type | Manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 175/65 R15 84H |
| Wheel rims size | 5.5J x 15 |
The F57 Mini Convertible, launched in 2016, represented the third generation of Mini’s open-top model. The Cooper D 1.5 variant, powered by a three-cylinder diesel engine, was introduced as a fuel-efficient option aimed at buyers prioritizing economy and practicality alongside the Mini’s signature style. Built on the UKL1 platform (shared with other BMW Group vehicles), the F57 offered increased interior space and improved refinement compared to its predecessor. The 1.5-liter diesel engine, part of BMW’s B37 family, was a key component in Mini’s strategy to offer a diverse range of powertrain options, catering to varying customer needs and preferences.
Powertrain & Engine Architecture
The heart of the Cooper D 1.5 was the B37C15A engine, a 1.5-liter inline three-cylinder diesel. This engine featured a single turbocharger, intercooler, and direct injection via a common rail system. The B37 engine family was notable for its compact design and advanced technologies aimed at maximizing efficiency and reducing emissions. The engine produced 116 horsepower at 4000 rpm and 270 Nm (199 lb-ft) of torque between 1750 and 2250 rpm. This torque delivery provided good low-end responsiveness, making it suitable for everyday driving. The engine also incorporated a particulate filter to meet stringent Euro 6 emission standards. The standard transmission was a 6-speed manual gearbox, although a 6-speed automatic transmission was also available as an option. The automatic transmission was designed to provide smooth shifts and contribute to overall fuel economy.
Driving Characteristics
The Cooper D 1.5 Convertible offered a comfortable and refined driving experience, prioritizing fuel efficiency over outright performance. Acceleration from 0 to 60 mph took approximately 9.4 seconds, and the top speed was 195 km/h (121 mph). While not as quick as the Cooper or Cooper S models, the diesel engine provided ample torque for everyday driving situations. The manual transmission offered precise shifts, while the automatic provided convenience in urban environments. The car’s handling was typical of the Mini brand – agile and responsive, with well-weighted steering. However, the added weight of the convertible mechanism and the diesel engine did slightly impact the car’s overall balance compared to the hardtop models. The suspension provided a good balance between comfort and handling, absorbing bumps and imperfections in the road while maintaining a stable feel.
Equipment & Trim Levels
The Cooper D 1.5 Convertible came standard with a range of features, including air conditioning, power windows, central locking, and a basic audio system. Upholstery was typically cloth, with leather options available as an upgrade. Standard safety equipment included ABS, airbags, and stability control. Optional extras included a premium sound system, navigation system, heated seats, and a variety of styling packages. The “Chilli” package was a popular option, adding sport seats, a sport steering wheel, and other cosmetic enhancements. The convertible top was fully automatic and could be operated at speeds up to 30 mph. Interior trim options allowed for personalization, with a range of colors and materials available.
Chassis & Braking
The F57 Convertible utilized a McPherson strut front suspension and a multi-link rear suspension, providing a comfortable and controlled ride. The front brakes were ventilated discs, while the rear brakes were solid discs. ABS (Anti-lock Braking System) was standard, enhancing braking performance and stability. The car’s chassis was reinforced to compensate for the loss of structural rigidity associated with the convertible body style. The steering system was electric power-assisted, providing precise and responsive steering feel. The standard tire size was 175/65 R15, although larger wheels and tires were available as options.
Market Reception & Comparison
The Mini Convertible Cooper D 1.5 was generally well-received by critics, who praised its fuel efficiency and stylish design. However, some reviewers noted that the diesel engine lacked the sporty character of the petrol engines. Compared to the Cooper, the Cooper D offered significantly better fuel economy but less power and acceleration. Compared to the Cooper S, the difference in performance was even more pronounced. The Cooper D appealed to buyers who prioritized economy and practicality over outright performance, making it a popular choice for city driving and long-distance commuting. Its fuel economy figures of around 58.8-61.9 US mpg were a major selling point.
Legacy
The Cooper D 1.5 Convertible remains a relatively common sight on the used car market. The B37 engine has proven to be generally reliable, although regular maintenance is essential. Common issues include diesel particulate filter (DPF) problems, particularly on cars that have primarily been used for short journeys. The convertible mechanism is also a potential source of issues, requiring periodic inspection and maintenance. Overall, the F57 Cooper D 1.5 Convertible offers a stylish and economical way to experience the open-top Mini lifestyle, and well-maintained examples continue to hold their value.
