Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (F57, facelift 2018) |
| Type (Engine) | Cooper 1.5 (136 Hp) Steptronic |
| Start of production | 2018 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.2-6.3 l/100 km (37.9 – 37.3 US mpg, 45.6 – 44.8 UK mpg, 16.1 – 15.9 km/l) |
| Fuel consumption (extra urban) | 4.5-4.7 l/100 km (52.3 – 50 US mpg, 62.8 – 60.1 UK mpg, 22.2 – 21.3 km/l) |
| Fuel consumption (combined) | 5.1-5.3 l/100 km (46.1 – 44.4 US mpg, 55.4 – 53.3 UK mpg, 19.6 – 18.9 km/l) |
| CO2 emissions | 119-123 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 | 9 kg/Hp, 110.6 Hp/tonne |
| Weight-to-torque ratio | 5.3 kg/Nm, 187 Nm/tonne |
| Power | 136 Hp @ 4400-6000 rpm |
| Power per litre | 90.7 Hp/l |
| Torque | 230 Nm @ 1250-4300 rpm (169.64 lb.-ft. @ 1250-4300 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 | 1230 kg (2711.69 lbs.) |
| Max. weight | 1695 kg (3736.84 lbs.) |
| Max load | 465 kg (1025.15 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 |
The Mini Convertible Cooper 1.5 (136 Hp) Steptronic, introduced with the F57 facelift in 2018, represents a significant iteration of the third-generation Mini Convertible (F57) released in 2016. Positioned as a mid-range offering within the Convertible lineup, this variant aimed to strike a balance between affordability and a respectable level of performance and features. The F57 facelift brought with it styling updates, revised interior trim, and improvements to the engine range, including this 1.5-liter turbocharged three-cylinder option paired with a six-speed Steptronic automatic transmission. Production of this specific configuration was limited to the 2018 model year, making it a relatively uncommon find on the used car market.
Powertrain & Engine Architecture
At the heart of the Cooper 1.5 Steptronic lies the BMW Group’s B38A15A engine, a 1.5-liter inline three-cylinder gasoline engine. This engine is a member of the modular B-series engine family, renowned for its compact size, lightweight construction, and efficiency. It utilizes direct fuel injection, a single twin-scroll turbocharger, and variable valve timing (VANOS) on both the intake and exhaust sides to optimize performance and fuel economy. The engine produces 136 horsepower at 4400-6000 rpm and 230 Nm (169.64 lb-ft) of torque between 1250-4300 rpm. The six-speed Steptronic automatic transmission is a conventional torque-converter automatic, offering smooth shifts and a focus on comfort rather than outright performance. It lacks the paddle shifters found on some higher-spec Mini models, prioritizing ease of use over driver engagement.
Driving Characteristics
The 1.5-liter engine, while offering adequate performance for everyday driving, isn’t particularly sporty. Acceleration from 0-60 mph takes approximately 8.3 seconds, and the top speed is 128 mph. The Steptronic transmission is programmed for fuel efficiency, often upshifting quickly to maintain lower engine speeds. This can result in a slight delay in response when requesting sudden acceleration. Compared to the more powerful Cooper S models, or even the diesel-powered Cooper D, this variant feels noticeably less energetic. However, the engine’s readily available low-end torque makes it suitable for urban driving and cruising. The automatic transmission contributes to a relaxed driving experience, particularly in stop-and-go traffic. The steering is light and precise, typical of Mini’s handling characteristics, but doesn’t offer the same level of feedback as the manual transmission variants.
Equipment & Trim Levels
The Cooper 1.5 Steptronic typically included standard features such as air conditioning, power windows, a basic infotainment system with a 6.5-inch display, Bluetooth connectivity, and alloy wheels. Optional extras included a larger 8.8-inch touchscreen infotainment system with navigation, a Harman Kardon sound system, leather upholstery, heated seats, and various styling packages. The interior design followed the classic Mini aesthetic, with a centrally mounted speedometer and a focus on creating a fun and stylish atmosphere. The convertible top was a fully automatic fabric roof, available in a range of colors, and designed for relatively quiet operation at highway speeds.
Chassis & Braking
The F57 Convertible utilizes a front-wheel-drive chassis with independent suspension all around. The front suspension employs a McPherson strut design, while the rear features a multi-link setup. This configuration provides a good balance between ride comfort and handling. The Cooper 1.5 Steptronic came equipped with ventilated front disc brakes and solid rear disc brakes. Anti-lock Braking System (ABS) was standard. The suspension tuning was geared towards comfort, resulting in a softer ride compared to the more performance-oriented Cooper S models. Stabilizer bars were fitted front and rear to reduce body roll during cornering, though the effect is less pronounced than in the sportier trims.
Market Reception & Comparison
The Cooper 1.5 Steptronic was generally well-received as an accessible entry point into the Mini Convertible range. Critics praised its fuel efficiency and comfortable ride, but noted its lack of outright performance compared to other variants. The 1.8L engine in earlier models was replaced by the 1.5L for improved efficiency and emissions. Compared to the Cooper D (diesel), the 1.5 offered a more refined driving experience but lower fuel economy. The Cooper S provided significantly more power and a sportier driving experience, but at a higher price point. The automatic transmission was seen as a convenient option for urban drivers, but some enthusiasts preferred the engagement of the manual gearbox. It filled a niche for buyers wanting the style of a Mini Convertible without the higher price tag of the more powerful models.
Legacy
The B38 engine family has proven to be relatively reliable, although some owners have reported issues with the timing chain and cooling system. Regular maintenance, including oil changes and coolant flushes, is crucial for ensuring long-term reliability. The Cooper 1.5 Steptronic remains a popular choice in the used car market, offering a stylish and practical convertible experience at an affordable price. Its relatively simple mechanicals and readily available parts contribute to its appeal as a used car purchase. However, potential buyers should be aware of the potential for timing chain wear and ensure that the vehicle has been properly maintained. The limited production run of the 2018 facelift model may also contribute to its future collectibility among Mini enthusiasts.
