The Opel Astra H TwinTop 1.6i 16V ECOTEC (105 hp) was a front-wheel-drive, two-door coupe-convertible produced between May 2006 and July 2007. Positioned as an entry-level offering within the Astra H TwinTop range, it provided an accessible route to open-top motoring. This variant utilized Opel’s ‘ECOTEC’ engine family, emphasizing fuel efficiency alongside reasonable performance. It was part of the H generation Astra, built on the GM Delta platform, and aimed at buyers seeking a stylish and practical convertible without the higher price tags associated with more powerful engine options.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra H TwinTop |
| Type (Engine) | 1.6i 16V ECOTEC (105 Hp) |
| Start of production | May, 2006 |
| End of production | July, 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe – 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) | 5.8 l/100 km (40.6 US mpg, 48.7 UK mpg, 17.2 km/l) |
| Fuel consumption (combined) | 7 l/100 km (33.6 US mpg, 40.4 UK mpg, 14.3 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 14.1 sec |
| Acceleration 0 – 62 mph | 14.1 sec |
| Acceleration 0 – 60 mph | 13.4 sec |
| Maximum speed | 192 km/h (119.3 mph) |
| Weight-to-power ratio | 13.3 kg/Hp, 75.3 Hp/tonne |
| Weight-to-torque ratio | 9.3 kg/Nm, 107.5 Nm/tonne |
| Power | 105 Hp @ 6000 rpm |
| Power per litre | 65.7 Hp/l |
| Torque | 150 Nm @ 3900 rpm (110.63 lb.-ft. @ 3900 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | Z16XEP, Z16XE1 |
| 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 | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 4 l (4.23 US qt | 3.52 UK qt) |
| Coolant | 6.1 l (6.45 US qt | 5.37 UK qt) |
| Kerb Weight | 1395 kg (3075.45 lbs.) |
| Max. weight | 1865 kg (4111.62 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 | 5 gears, manual transmission |
| Front suspension | Coil spring |
| Rear suspension | Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Drum |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 205/55 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The Astra H TwinTop 1.6i utilized either the Z16XEP or Z16XE1 engine code, both belonging to Opel’s Ecotec family. These were 1.6-liter, inline-four cylinder engines featuring multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain. The engine produced 105 horsepower at 6000 rpm and 150 Nm (110.63 lb-ft) of torque at 3900 rpm. The engine’s design prioritized fuel efficiency and smooth operation over outright performance. The 1.6L engine was paired with a five-speed manual transmission as standard, offering a relatively conventional gear ratio spread. The transmission was chosen for its cost-effectiveness and suitability for the engine’s power output.
Driving Characteristics
The 1.6-liter engine, coupled with the car’s weight (approximately 1395 kg or 3075 lbs), resulted in a 0-60 mph acceleration time of around 13.4 seconds and a top speed of 192 km/h (119.3 mph). Compared to the more powerful 1.8L or turbocharged variants of the Astra H TwinTop, the 1.6i felt noticeably less responsive. The five-speed manual transmission helped to keep the engine within its optimal power band, but required frequent downshifts during overtaking maneuvers or when climbing hills. The power delivery was linear, but lacked the punch of the larger engines. The suspension was tuned for comfort, providing a reasonably smooth ride, but didn’t offer the same level of handling precision as the sportier trims.
Equipment & Trim Levels
The 1.6i TwinTop typically came with a base level of equipment, including power windows, central locking, and an audio system. Air conditioning was often an optional extra. Interior upholstery was typically cloth, and the dashboard featured a straightforward design. Optional extras included alloy wheels, upgraded audio systems, and parking sensors. The trim level was generally considered entry-level, focusing on providing a functional and affordable convertible experience.
Chassis & Braking
The Astra H TwinTop 1.6i featured a coil spring suspension setup at the front and a transverse stabilizer at the rear. The front brakes were ventilated discs, providing adequate stopping power for the car’s weight and performance. However, the rear brakes were drums, which were less effective than disc brakes and could fade under heavy use. The steering was a rack and pinion system, offering reasonable precision and feedback. The tires were typically 205/55 R16, providing a balance between grip and comfort.
Market Reception & Comparison
The Astra H TwinTop 1.6i was generally well-received as an affordable entry point into the convertible market. Critics praised its stylish design and comfortable ride, but noted its lack of performance compared to higher-powered variants. Fuel economy was a strong point, with combined fuel consumption figures around 7 l/100 km (33.6 US mpg). Compared to the 1.8L TwinTop, the 1.6i offered lower running costs but significantly less performance. The 1.8L provided a more engaging driving experience, while the 1.6i prioritized fuel efficiency and affordability. The 1.6i appealed to buyers who prioritized style and open-top motoring over outright speed.
Legacy
The Opel Astra H TwinTop 1.6i, while not the most powerful or dynamically engaging version of the Astra H TwinTop, remains a relatively affordable and accessible convertible in the used car market. The Ecotec engine is generally considered reliable, although regular maintenance is essential. Common issues include oil leaks and occasional sensor failures. The convertible top mechanism requires periodic lubrication to ensure smooth operation. The 1.6i TwinTop represents a practical and stylish option for those seeking an entry-level convertible, offering a balance of affordability, fuel efficiency, and open-top enjoyment.
