The Mini Convertible (F57) Cooper SD 2.0 Steptronic, produced from 2016 to 2018, represents a compelling blend of fuel efficiency, sporty handling, and open-air motoring within the third generation of the modern Mini Convertible. Positioned as a mid-range offering in the F57 lineup, it catered to buyers seeking a balance between performance and economy, slotting below the more powerful Cooper S variants and above the base Cooper models. This variant utilized a 2.0-liter turbocharged diesel engine paired with a six-speed Steptronic automatic transmission, making it a popular choice in European markets where diesel fuel was prevalent and road tax was often linked to CO2 emissions.
Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (F57) |
| Type (Engine) | Cooper SD 2.0 (170 Hp) Steptronic |
| Start of production | 2016 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 5.0-4.9 l/100 km (47 – 48 US mpg) |
| Fuel consumption (extra urban) | 4.1-3.9 l/100 km (57.4 – 60.3 US mpg) |
| Fuel consumption (combined) | 4.4-4.3 l/100 km (53.5 – 54.7 US mpg) |
| CO2 emissions | 116-113 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.7 sec |
| Acceleration 0 – 62 mph | 7.7 sec |
| Acceleration 0 – 60 mph | 7.3 sec |
| Maximum speed | 218 km/h (135.46 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7.2 kg/Hp |
| Weight-to-torque ratio | 3.4 kg/Nm |
| Power | 170 Hp @ 4000 rpm |
| Torque | 360 Nm @ 1500-2750 rpm (265.52 lb.-ft. @ 1500-2750 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B47C20B |
| Engine displacement | 1995 cm3 (121.74 cu. in.) |
| Number of cylinders | 4 |
| 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 | 5 l (5.28 US qt | 4.4 UK qt) |
| Coolant | 3.3 l (3.49 US qt | 2.9 UK qt) |
| Kerb Weight | 1230 kg (2711.69 lbs.) |
| Max. weight | 1770 kg (3902.18 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 | 3850 mm (151.57 in.) |
| Width | 1727 mm (67.99 in.) |
| Height | 1415 mm (55.71 in.) |
| Wheelbase | 2495 mm (98.23 in.) |
| Front track | 1485 mm (58.46 in.) |
| Rear (Back) track | 1485 mm (58.46 in.) |
| Ride height (ground clearance) | 115 mm (4.53 in.) |
| Drag coefficient (Cd) | 0.36 |
| Minimum turning circle | 10.8 m (35.43 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 6 |
| Gearbox type | Automatic transmission Steptronic |
| 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 | 195/55 R16 87W |
| Wheel rims size | 6.5J x 16 |
INTRODUCTION
The F57 Mini Convertible, launched in 2016, marked the third generation of Mini’s open-top model. Built on the UKL1 platform (shared with the BMW 2 Series Active Tourer), it offered increased interior space and a more refined driving experience compared to its predecessors. The Cooper SD 2.0 Steptronic variant was a key component of the range, appealing to drivers prioritizing fuel economy and relaxed cruising. It was particularly popular in Europe, where diesel engines enjoyed a significant market share due to favorable taxation and fuel costs. The “SD” designation signifies a diesel engine with sequential turbocharging, enhancing both power and efficiency.
Powertrain & Engine Architecture
At the heart of the Cooper SD 2.0 Steptronic lies the BMW Group’s B47C20B engine, a 2.0-liter inline-four cylinder diesel. This engine is characterized by its advanced technology, including a common rail direct injection system operating at pressures up to 2,000 bar, and a twin-scroll turbocharger. The twin-scroll design minimizes turbo lag, providing quicker throttle response. The engine also features variable valve timing (VANOS) and a cooled exhaust gas recirculation (EGR) system to reduce emissions. The B47 engine family is known for its robust construction and relatively high specific output.
The six-speed Steptronic automatic transmission is a torque-converter type, offering smooth and efficient gear changes. It features a lock-up clutch to improve fuel economy at cruising speeds. The transmission is electronically controlled and adapts its shift points based on driving style and road conditions. While not as sporty as the available six-speed manual transmission, the Steptronic provides a more convenient driving experience, particularly in urban traffic.
Driving Characteristics
The Cooper SD 2.0 Steptronic delivers a respectable 170 horsepower and 360 Nm (265 lb-ft) of torque, providing adequate performance for everyday driving. Acceleration from 0 to 60 mph takes around 7.3-7.7 seconds, and the car has a top speed of 135 mph. The automatic transmission contributes to a relaxed driving experience, with smooth gear changes and predictable power delivery. However, compared to the more powerful Cooper S variants, the SD feels less eager to accelerate. The torque curve is relatively flat, providing good pulling power from low engine speeds, which is beneficial for overtaking and navigating hilly terrain. The convertible top mechanism does slightly impact structural rigidity, but the F57 chassis is well-engineered to minimize this effect.
Equipment & Trim Levels
The Cooper SD 2.0 Steptronic typically came equipped with a generous level of standard features. These included air conditioning, power windows, central locking, a multi-function steering wheel, and a Mini Visual Boost infotainment system with a 6.5-inch display. Upholstery was typically cloth, but leather options were available. Common optional extras included navigation, heated seats, park distance control, and a premium sound system. Trim levels could vary depending on the market, but generally, the Cooper SD offered a good balance of comfort and convenience features.
Chassis & Braking
The F57 Mini Convertible utilizes a McPherson strut front suspension and a multi-link rear suspension. This setup provides a good balance of ride comfort and handling precision. The steering is electrically assisted and offers precise control. The Cooper SD 2.0 Steptronic is equipped with ventilated front disc brakes and solid rear disc brakes. Anti-lock Braking System (ABS) is standard, along with Electronic Stability Control (ESC). The suspension is tuned to provide a comfortable ride, but it can feel slightly firm on rough roads. The car’s weight distribution is relatively balanced, contributing to its agile handling characteristics.
Market Reception & Comparison
The Mini Convertible Cooper SD 2.0 Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and stylish design. However, some reviewers noted that the diesel engine could be slightly noisy compared to petrol alternatives. Compared to the Cooper S, the SD offered lower running costs but less outright performance. Against competitors like the Fiat 500C and the Peugeot 308 CC, the Mini Convertible stood out with its premium feel and engaging driving dynamics. Fuel economy figures consistently hovered around 53-55 mpg on the combined cycle, making it an attractive option for drivers covering long distances.
Legacy
The B47 engine family, including the B47C20B used in the Cooper SD, has proven to be relatively reliable, although some early examples experienced issues with timing chain tensioners. Regular maintenance, including oil changes and filter replacements, is crucial for ensuring long-term reliability. On the used car market, the F57 Cooper SD 2.0 Steptronic represents a good value proposition, offering a stylish and economical open-top motoring experience. Its fuel efficiency and relatively low maintenance costs make it an appealing choice for buyers seeking a practical and enjoyable convertible.
