The Opel Astra J Sedan 1.4 Turbo ecoFLEX Start/Stop, produced from 2012 to 2018, represented a significant offering in the compact sedan segment, particularly within the European market. Positioned as a fuel-efficient and moderately powered variant of the Astra J Sedan, it aimed to balance practicality with reasonable performance and running costs. This model was part of the broader Astra J range (2009-2015), built on the GM Delta II platform, and served as a key competitor to vehicles like the Ford Focus, Volkswagen Golf, and Peugeot 308. The “ecoFLEX” designation indicated Opel’s commitment to fuel economy through technologies like Start/Stop functionality and aerodynamic enhancements.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra J Sedan |
| Type (Engine) | 1.4 Turbo ecoFLEX Start/Stop (140 Hp) |
| Start of production | 2012 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 7.2-7.5 l/100 km (32.7 – 31.4 US mpg, 39.2 – 37.7 UK mpg, 13.9 – 13.3 km/l) |
| Fuel consumption (extra urban) | 4.7-4.9 l/100 km (50 – 48 US mpg, 60.1 – 57.6 UK mpg, 21.3 – 20.4 km/l) |
| Fuel consumption (combined) | 5.6-5.9 l/100 km (42 – 39.9 US mpg, 50.4 – 47.9 UK mpg, 17.9 – 16.9 km/l) |
| CO2 emissions | 132-138 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 10.4 sec |
| Acceleration 0 – 62 mph | 10.4 sec |
| Acceleration 0 – 60 mph | 9.9 sec |
| Maximum speed | 200 km/h (124.27 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 10 kg/Hp, 99.6 Hp/tonne |
| Weight-to-torque ratio | 7 kg/Nm, 142.3 Nm/tonne |
| Power | 140 Hp @ 4900-6000 rpm |
| Power per litre | 102.6 Hp/l |
| Torque | 200 Nm @ 1850-4900 rpm (147.51 lb.-ft. @ 1850-4900 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | A14NET |
| Engine displacement | 1364 cm3 (83.24 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 72.5 mm (2.85 in.) |
| Piston Stroke | 82.6 mm (3.25 in.) |
| Compression ratio | 9.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 4 l (4.23 US qt | 3.52 UK qt) |
| Coolant | 6.2 l (6.55 US qt | 5.46 UK qt) |
| Kerb Weight | 1405-1515 kg (3097.49 – 3340 lbs.) |
| Max. weight | 1915-2025 kg (4221.85 – 4464.36 lbs.) |
| Max load | 510 kg (1124.36 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Trunk (boot) space – maximum | 1010 l (35.67 cu. ft.) |
| Fuel tank capacity | 56 l (14.79 US gal | 12.32 UK gal) |
| Permitted trailer load with brakes (12%) | 1050-1400 kg (2314.85 – 3086.47 lbs.) |
| Permitted trailer load without brakes | 680-730 kg (1499.14 – 1609.37 lbs.) |
| Length | 4658 mm (183.39 in.) |
| Width | 1814 mm (71.42 in.) |
| Width including mirrors | 2013 mm (79.25 in.) |
| Height | 1500 mm (59.06 in.) |
| Wheelbase | 2685 mm (105.71 in.) |
| Front track | 1541 mm (60.67 in.) |
| Rear (Back) track | 1551 mm (61.06 in.) |
| Front overhang | 974 mm (38.35 in.) |
| Rear overhang | 999 mm (39.33 in.) |
| Minimum turning circle | 11.5 m (37.73 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
Powertrain & Engine Architecture
The heart of the Astra J Sedan 1.4 Turbo ecoFLEX Start/Stop is the A14NET engine, a 1.4-liter inline-four cylinder gasoline engine. This engine utilizes a single-scroll turbocharger with an intercooler to boost power and efficiency. The A14NET features multi-point fuel injection and a timing chain for durability. The engine’s 9.5:1 compression ratio strikes a balance between performance and fuel economy. The Start/Stop system, a key component of the ecoFLEX package, automatically shuts off the engine when the vehicle is stationary (at traffic lights, for example) and restarts it instantly when the driver depresses the clutch or brake pedal. This system contributes significantly to reduced fuel consumption in urban driving conditions. The engine is transversely mounted at the front of the vehicle, driving the front wheels. The standard transmission was a six-speed manual gearbox, although a six-speed automatic transmission was also available as an option.
Driving Characteristics
The 140 hp and 200 Nm (147.51 lb-ft) of torque provided by the 1.4 Turbo engine offered adequate performance for everyday driving. Acceleration from 0-60 mph took approximately 9.9 seconds, and top speed was limited to 200 km/h (124 mph). While not a particularly sporty setup, the engine delivered a usable amount of power across a broad rev range, with peak torque available from 1850-4900 rpm. The six-speed manual transmission allowed drivers to keep the engine in its optimal power band. Compared to the more powerful 1.6 Turbo or diesel variants, this engine prioritized fuel efficiency over outright speed. The automatic transmission, while offering convenience, could sometimes feel hesitant during quick acceleration, and resulted in slightly slower 0-60 times. The suspension was tuned for comfort, providing a relatively smooth ride, but it wasn’t as engaging as some of its rivals.
Equipment & Trim Levels
The 1.4 Turbo ecoFLEX Start/Stop typically came equipped with a reasonable level of standard features. These included air conditioning, electric front windows, a CD/MP3 stereo system, and ABS brakes. Higher trim levels, such as Sport or SE, added features like alloy wheels, cruise control, automatic climate control, and a touchscreen infotainment system. Interior upholstery was typically cloth, with options for leather available on higher trims. Optional extras included parking sensors, a sunroof, and upgraded audio systems.
Chassis & Braking
The Astra J Sedan utilized a MacPherson strut front suspension and a torsion beam rear suspension. The front brakes were ventilated discs, providing good stopping power, while the rear brakes were typically drum brakes on lower trims, upgraded to discs on higher-spec models. The electric power steering offered light and precise steering feel. Stabilizer bars were fitted to both the front and rear axles to reduce body roll during cornering. The chassis was designed to balance comfort and handling, providing a stable and predictable driving experience.
Market Reception & Comparison
The Astra J Sedan 1.4 Turbo ecoFLEX Start/Stop was generally well-received by critics for its fuel efficiency and affordability. It offered a compelling alternative to more expensive and less economical rivals. However, some reviewers noted that the engine could feel strained when fully loaded or driving uphill. Compared to the 1.6 Turbo, the 1.4 offered lower performance but significantly better fuel economy. The diesel variants provided even better fuel economy but came with a higher purchase price and potential maintenance costs. The Astra J Sedan consistently scored well in safety tests, contributing to its popularity as a family car.
Legacy
The A14NET engine, while generally reliable, has been known to exhibit occasional issues with the turbocharger and fuel injectors. The Start/Stop system can also experience problems with the starter motor over time. However, with regular maintenance, these engines can provide many years of reliable service. On the used car market, the Astra J Sedan 1.4 Turbo ecoFLEX Start/Stop represents a good value proposition, offering a blend of practicality, fuel efficiency, and affordability. Its relatively low running costs and readily available parts make it an attractive option for budget-conscious buyers.
