The Mini Convertible (F57) Cooper 1.5, equipped with the Steptronic automatic transmission and producing 136 horsepower, was a key variant in the third generation of the modern Mini Convertible. Introduced for the 2016 model year and continuing through 2018, this model occupied the entry-level position in the F57 lineup, offering an accessible and fuel-efficient open-top driving experience. It was positioned as a stylish and fun alternative to more practical compact cars, appealing to buyers prioritizing image and driving enjoyment over outright performance or spaciousness. The F57 generation represented a significant growth in size and refinement compared to its predecessors, aiming to broaden the Mini’s appeal beyond its core enthusiast base.
Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (F57) |
| Type (Engine) | Cooper 1.5 (136 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) | 6.3-6.2 l/100 km (37.3 – 37.9 US mpg) |
| Fuel consumption (extra urban) | 4.7-4.5 l/100 km (50 – 52.3 US mpg) |
| Fuel consumption (combined) | 5.3-5.1 l/100 km (44.4 – 46.1 US mpg) |
| CO2 emissions | 123-119 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.7 sec |
| Acceleration 0 – 62 mph | 8.7 sec |
| Acceleration 0 – 60 mph | 8.3 sec |
| Maximum speed | 206 km/h (128 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.5 kg/Hp |
| Weight-to-torque ratio | 5.3 kg/Nm |
| Power | 136 Hp @ 4400 rpm |
| Torque | 220 Nm @ 1250 rpm (162.26 lb.-ft. @ 1250 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B38A15A |
| Engine displacement | 1499 cm3 (91.47 cu. in.) |
| Number of cylinders | 3 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 4.25 l (4.49 US qt | 3.74 UK qt) |
| Coolant | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Kerb Weight | 1155 kg (2546.34 lbs.) |
| Max. weight | 1695 kg (3736.84 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 | 40 l (10.57 US gal | 8.8 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) | 0.34 |
| 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 | 175/65 R15 84H |
| Wheel rims size | 5.5J x 15 |
Powertrain & Engine Architecture
The heart of the F57 Cooper 1.5 Steptronic is the BMW Group’s B38A15A 1.5-liter inline three-cylinder gasoline engine. This engine is a member of the modular B-series engine family, known for its compact size, lightweight construction, and advanced technology. It utilizes direct fuel injection, a single twin-scroll turbocharger with an intercooler, and fully variable valve timing (VANOS) and valve lift (Valvetronic) systems. These technologies work in concert to deliver a balance of performance and efficiency. The engine produces 136 horsepower at 4400 rpm and 220 Nm (162 lb-ft) of torque from as low as 1250 rpm. The Steptronic automatic transmission is a six-speed torque converter automatic, offering smooth and convenient gear changes. It features a sport mode and, in some configurations, steering wheel-mounted paddle shifters for more driver control.
Driving Characteristics
The 1.5-liter engine paired with the Steptronic transmission provides a comfortable and refined driving experience. While not overtly sporty, the Cooper 1.5 offers adequate acceleration for everyday driving, achieving 0-60 mph in approximately 8.3 seconds. The automatic transmission is well-tuned, providing seamless shifts and contributing to the car’s ease of use. Compared to the six-speed manual version, the Steptronic offers less driver engagement but greater convenience, particularly in urban traffic. The torque delivery is relatively flat, making it easy to navigate city streets. Compared to the more powerful Cooper S models, the 1.5 lacks the same level of outright performance, but it compensates with improved fuel economy and a lower price point.
Equipment & Trim Levels
The Cooper 1.5 Steptronic typically came standard with features such as air conditioning, power windows and locks, a multi-function steering wheel, and a basic infotainment system with Bluetooth connectivity. Upholstery was generally cloth, though leather options were available. Common optional extras included a premium sound system, navigation, heated seats, and various styling packages. The Convertible also featured a fully automatic fabric roof that could be opened or closed in a matter of seconds, even while driving at low speeds. Trim levels varied slightly by market, but generally offered packages that added cosmetic enhancements and additional convenience features.
Chassis & Braking
The F57 Convertible utilizes a McPherson strut front suspension and a multi-link rear suspension, providing a comfortable ride and decent handling characteristics. The suspension is tuned to prioritize comfort over outright sportiness, but the car still feels stable and predictable in corners. Braking duties are handled by ventilated discs at the front and solid discs at the rear. Anti-lock braking system (ABS) is standard. The steering is electrically assisted, providing light and precise control. The car’s relatively low weight contributes to its agility and responsiveness.
Market Reception & Comparison
The Mini Convertible (F57) Cooper 1.5 Steptronic was generally well-received by automotive critics. It was praised for its stylish design, comfortable ride, and fuel efficiency. However, some reviewers noted that the 1.5-liter engine could feel underpowered, particularly when fully loaded or on uphill climbs. Compared to other trims, such as the Cooper S, the 1.5 offered a more affordable entry point into the Mini Convertible range, making it attractive to buyers prioritizing value and economy. Fuel economy figures of around 44-46 mpg combined were a significant selling point.
Legacy
The B38 engine family, including the 1.5-liter variant used in the F57 Cooper, has proven to be relatively reliable. While some early examples experienced issues with the timing chain, these were generally addressed through warranty repairs. Today, used F57 Cooper 1.5 models represent a relatively affordable way to experience Mini ownership. The Steptronic transmission is generally considered durable, but regular maintenance, including fluid changes, is essential. The car’s enduring appeal lies in its unique styling, fun-to-drive character, and relatively low running costs.
