The Opel Astra H TwinTop 1.6i 16V Turbo, produced between November 2006 and June 2010, represents a compelling blend of open-air motoring and turbocharged performance within the Astra H range. This variant, a coupe-cabriolet, occupied a mid-range position in the TwinTop lineup, offering a step up in power and refinement compared to the base models while remaining more accessible than the more potent, though less common, performance-oriented trims. It was primarily marketed in Europe, offering a stylish and relatively affordable convertible option in the compact class.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra H TwinTop |
| Type (Engine) | 1.6i 16V Turbo (180 Hp) |
| Start of production | November, 2006 |
| End of production | June, 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe – Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 13 l/100 km (18.1 US mpg, 21.7 UK mpg, 7.7 km/l) |
| Fuel consumption (extra urban) | 7 l/100 km (33.6 US mpg, 40.4 UK mpg, 14.3 km/l) |
| Fuel consumption (combined) | 9.2 l/100 km (25.6 US mpg, 30.7 UK mpg, 10.9 km/l) |
| CO2 emissions | 221 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.5 sec |
| Acceleration 0 – 62 mph | 9.5 sec |
| Acceleration 0 – 60 mph | 9 sec |
| Maximum speed | 224 km/h (139.19 mph) |
| Weight-to-power ratio | 8.4 kg/Hp, 119.6 Hp/tonne |
| Weight-to-torque ratio | 6.5 kg/Nm, 152.8 Nm/tonne |
| Power | 180 Hp @ 5500 rpm |
| Power per litre | 112.6 Hp/l |
| Torque | 230 Nm @ 1980 rpm (169.64 lb.-ft. @ 1980 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | Z16LET |
| Engine displacement | 1598 cm3 (97.52 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 79 mm (3.11 in.) |
| Piston Stroke | 81.5 mm (3.21 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 4.5 l (4.76 US qt | 3.96 UK qt) |
| Coolant | 5.9 l (6.23 US qt | 5.19 UK qt) |
| Kerb Weight | 1505 kg (3317.96 lbs.) |
| Max. weight | 1975 kg (4354.13 lbs.) |
| Max load | 470 kg (1036.17 lbs.) |
| Trunk (boot) space – minimum | 205 l (7.24 cu. ft.) |
| Trunk (boot) space – maximum | 440 l (15.54 cu. ft.) |
| Fuel tank capacity | 52 l (13.74 US gal | 11.44 UK gal) |
| Length | 4476 mm (176.22 in.) |
| Width | 1759 mm (69.25 in.) |
| Width with mirrors folded | 1831 mm (72.09 in.) |
| Width including mirrors | 2021 mm (79.57 in.) |
| Height | 1411 mm (55.55 in.) |
| Wheelbase | 2614 mm (102.91 in.) |
| Front track | 1488 mm (58.58 in.) |
| Rear (Back) track | 1481 mm (58.31 in.) |
| Front overhang | 909 mm (35.79 in.) |
| Rear overhang | 953 mm (37.52 in.) |
| Ride height (ground clearance) | 122 mm (4.8 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle | 11.2 m (36.75 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 suspension | Coil spring |
| Rear suspension | Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 225/45 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
At the heart of the Astra H TwinTop 1.6i 16V Turbo lies the Z16LET engine, a 1.6-liter inline-four cylinder powerplant. This engine is characterized by its turbocharging and intercooling, which significantly boost power output. The Z16LET utilizes multi-port fuel injection, delivering fuel directly into the intake ports. The engine features a double overhead camshaft (DOHC) valvetrain, optimizing airflow for improved performance. The compression ratio is set at 10.5:1. The engine produces 180 horsepower at 5500 rpm and 230 Nm (169.64 lb-ft) of torque at 1980 rpm. The engine is transversely mounted, driving the front wheels. The standard transmission for this variant was a six-speed manual gearbox, although an automatic transmission was also available, albeit less common.
Driving Characteristics
The 1.6-liter turbocharged engine provides a noticeable step up in performance compared to the naturally aspirated engines offered in the Astra H TwinTop range. Acceleration from 0 to 100 km/h (0-62 mph) takes approximately 9.5 seconds, and the car reaches a top speed of 224 km/h (139.19 mph). While not a sports car, the 180 hp engine delivers sufficient power for confident overtaking and enjoyable cruising. The turbocharger does introduce a degree of turbo lag, but the broad torque curve helps to mitigate this effect. The six-speed manual transmission allows for precise control and efficient use of the engine’s power. The automatic transmission, while offering convenience, typically resulted in slightly slower acceleration and increased fuel consumption.
Equipment & Trim Levels
The Astra H TwinTop 1.6i 16V Turbo typically came equipped with a reasonable level of standard features. These included air conditioning, power windows, central locking, and an audio system. Higher trim levels added features such as alloy wheels, leather upholstery, automatic climate control, and a more advanced audio system. The TwinTop’s retractable hardtop was a key feature, providing the security and weather protection of a coupe when raised, and the open-air experience of a convertible when lowered. Optional extras included parking sensors, heated seats, and a navigation system.
Chassis & Braking
The Astra H TwinTop utilized a coil spring suspension system at the front and a transverse stabilizer at the rear. The front brakes were ventilated discs, providing good stopping power, while the rear brakes were solid discs. ABS (Anti-lock Braking System) was standard. The chassis was reinforced to compensate for the loss of structural rigidity inherent in a convertible design. The steering system was a rack and pinion type, offering precise and responsive handling.
Market Reception & Comparison
The Astra H TwinTop 1.6i 16V Turbo was generally well-received by automotive critics. It was praised for its stylish design, comfortable interior, and enjoyable driving experience. However, some critics noted the relatively small trunk space when the roof was retracted. Compared to the lower-powered Astra TwinTop variants, the 1.6 Turbo offered a significant performance upgrade. Compared to the more expensive and powerful Astra OPC (Vauxhall VXR), the 1.6 Turbo provided a more balanced combination of performance, fuel economy, and affordability. Fuel economy was rated at around 9.2 l/100 km (25.6 US mpg), which was reasonable for a turbocharged convertible.
Legacy
The Opel Astra H TwinTop 1.6i 16V Turbo remains a popular choice in the used car market. The Z16LET engine is generally considered to be reliable, provided it has been properly maintained. Regular oil changes and adherence to the manufacturer’s service schedule are crucial for long-term reliability. Common issues include turbocharger wear and potential problems with the retractable hardtop mechanism. However, these issues are typically manageable with proper maintenance and repair. The Astra H TwinTop 1.6i 16V Turbo offers a compelling combination of style, performance, and affordability, making it a desirable option for those seeking a fun and practical convertible.
