The Mini Convertible (R57) Cooper S 1.6 Automatic, produced from August 2009 to February 2010, represented a compelling blend of performance and open-air motoring within the second generation (R57) Mini Convertible lineup. Positioned as a mid-range offering, it catered to drivers seeking a more spirited driving experience than the standard Cooper models, but without the outright performance and price premium of the John Cooper Works (JCW) variant. This particular configuration, pairing the 175 horsepower turbocharged engine with a six-speed automatic transmission, aimed to broaden the appeal of the Cooper S by offering ease of use and convenience alongside its sporty character. It was built on the 1HX0/A3 platform shared with the BMW 1 Series.
Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (R57) |
| Type (Engine) | Cooper S 1.6 (175 Hp) Automatic |
| Start of production | August, 2009 |
| End of production | February, 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 9.1 l/100 km (25.8 US mpg, 31 UK mpg, 11 km/l) |
| Fuel consumption (extra urban) | 5.1 l/100 km (46.1 US mpg, 55.4 UK mpg, 19.6 km/l) |
| Fuel consumption (combined) | 6.6 l/100 km (35.6 US mpg, 42.8 UK mpg, 15.2 km/l) |
| CO2 emissions | 153 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.6 sec |
| Acceleration 0 – 62 mph | 7.6 sec |
| Acceleration 0 – 60 mph | 7.2 sec |
| Maximum speed | 220 km/h (136.7 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 7.2 kg/Hp, 139.4 Hp/tonne |
| Weight-to-torque ratio | 4.8 kg/Nm, 207.2 Nm/tonne |
| Power | 175 Hp @ 5500 rpm |
| Power per litre | 109.5 Hp/l |
| Torque | 260 Nm @ 1600-5000 rpm (191.77 lb.-ft. @ 1600-5000 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | N14B16A |
| Engine displacement | 1598 cm3 (97.52 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 77 mm (3.03 in.) |
| Piston Stroke | 85.8 mm (3.38 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 4.2 l (4.44 US qt | 3.7 UK qt) |
| Coolant | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Kerb Weight | 1255 kg (2766.8 lbs.) |
| Max. weight | 1685 kg (3714.79 lbs.) |
| Max load | 430 kg (947.99 lbs.) |
| Trunk (boot) space – minimum | 125 l (4.41 cu. ft.) |
| Trunk (boot) space – maximum | 660 l (23.31 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Length | 3714 mm (146.22 in.) |
| Width | 1683 mm (66.26 in.) |
| Height | 1414 mm (55.67 in.) |
| Wheelbase | 2467 mm (97.13 in.) |
| Front track | 1453 mm (57.2 in.) |
| Rear (Back) track | 1461 mm (57.52 in.) |
| Ride height (ground clearance) | 130 mm (5.12 in.) |
| Minimum turning circle | 10.7 m (35.1 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Semi-independent, coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 195/55 R16 87V RSC |
| Wheel rims size | 6.5J x 16 LM |
Powertrain & Engine Architecture
At the heart of the Cooper S Convertible Automatic lies the N14B16A 1.6-liter inline-four cylinder engine. This engine, a product of BMW/PSA Peugeot Citroën collaboration, is characterized by its twin-scroll turbocharger and direct fuel injection. The direct injection system, operating at pressures up to 150 bar, ensures precise fuel delivery for optimal combustion and efficiency. The engine also features variable valve timing (VANOS) on both the intake and exhaust camshafts, further enhancing performance and responsiveness. The six-speed automatic transmission, a Getrag unit, was specifically tuned to complement the engine’s torque curve. While not offering the lightning-fast shifts of dual-clutch transmissions, it provided smooth and comfortable gear changes, making it well-suited for everyday driving. The transmission featured a Sport mode, which held gears longer and downshifted more aggressively for a more engaging driving experience.
Driving Characteristics
The 175 hp and 192 lb-ft of torque delivered by the N14 engine, coupled with the automatic transmission, resulted in a 0-60 mph time of around 7.2 seconds. While not blistering, this provided ample power for spirited driving and overtaking maneuvers. The automatic transmission, while convenient, did slightly diminish the sense of control compared to the six-speed manual version. The gear ratios were optimized for a balance between acceleration and fuel economy. In real-world conditions, the Cooper S Automatic felt responsive and eager, particularly in Sport mode. However, the automatic transmission could sometimes be hesitant during quick downshifts, and the engine’s turbo lag was noticeable at lower RPMs. Compared to the base Cooper’s 1.6-liter naturally aspirated engine, the Cooper S Automatic offered a significant performance upgrade. It also provided a more refined driving experience than the diesel-powered Cooper D variants.
Equipment & Trim Levels
The Cooper S Automatic typically came standard with features such as air conditioning, power windows and locks, a multi-function steering wheel, and a basic audio system. Upholstery was generally cloth, although leather options were available. The dashboard layout was characteristic of the R57 Mini, featuring a large central speedometer and a smaller tachometer. Optional extras included a premium sound system, navigation system, heated seats, and a panoramic sunroof. The Cooper S also benefited from sport-tuned suspension and larger brakes compared to the standard Cooper models. Chrome exterior trim elements and unique alloy wheel designs further distinguished the Cooper S from its siblings.
Chassis & Braking
The R57 Mini Convertible utilized a McPherson strut front suspension and a semi-independent rear suspension. The Cooper S models received a slightly stiffer suspension setup compared to the base Cooper, providing improved handling and reduced body roll. Front brakes were ventilated discs, while rear brakes were solid discs. Anti-lock Braking System (ABS) was standard. The steering was a rack-and-pinion system, offering precise and responsive steering feel. The relatively short wheelbase and wide track contributed to the Mini’s nimble handling characteristics.
Market Reception & Comparison
The Mini Convertible Cooper S Automatic was generally well-received by automotive critics. It was praised for its stylish design, fun-to-drive character, and comfortable interior. However, some reviewers noted the automatic transmission’s occasional hesitation and the engine’s turbo lag. Fuel economy was considered reasonable for a performance-oriented convertible, averaging around 35.6 US mpg in combined driving. Compared to other small convertibles on the market, the Mini offered a unique blend of British charm and German engineering. The Cooper S Automatic was more expensive than the base Cooper Convertible, but offered a significant performance advantage. It was also more affordable than the high-performance John Cooper Works Convertible.
Legacy
The N14 engine, while generally reliable, has been known to experience occasional issues with the high-pressure fuel pump and timing chain tensioner. Regular maintenance, including oil changes and timely replacement of wear items, is crucial for ensuring long-term reliability. Today, the R57 Cooper S Automatic remains a popular choice among used car buyers seeking a stylish and fun-to-drive convertible. Its relatively compact size, nimble handling, and distinctive design continue to appeal to enthusiasts. Well-maintained examples command a reasonable price in the used car market, reflecting the enduring appeal of the Mini brand.
