The Opel Astra H GTC 1.3 CDTI, producing 90 horsepower, was a variant of the Astra H GTC (Grand Touring Coupe) produced between April 2005 and October 2006. Positioned as an entry-level offering within the third generation (H) Astra lineup, it aimed to provide a more fuel-efficient and affordable option for buyers seeking the sporty styling of the GTC body style. This three-door hatchback was primarily marketed in Europe, offering a balance between practicality and a more dynamic driving experience compared to the five-door Astra. It was built on the GM Delta platform, also known as the 1HX0/A3 platform, shared with other vehicles like the Zafira and Vectra.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra H GTC |
| Type (Engine) | 1.3 CDTI (90 Hp) |
| Start of production | April, 2005 |
| End of production | October, 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (urban) | 6.2 l/100 km (37.9 US mpg, 45.6 UK mpg, 16.1 km/l) |
| Fuel consumption (extra urban) | 4 l/100 km (58.8 US mpg, 70.6 UK mpg, 25 km/l) |
| Fuel consumption (combined) | 4.8 l/100 km (49 US mpg, 58.9 UK mpg, 20.8 km/l) |
| CO2 emissions | 130 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 13.6 sec |
| Acceleration 0 – 62 mph | 13.6 sec |
| Acceleration 0 – 60 mph | 12.9 sec |
| Maximum speed | 174 km/h (108.12 mph) |
| Weight-to-power ratio | 13.7 kg/Hp, 73.2 Hp/tonne |
| Weight-to-torque ratio | 6.2 kg/Nm, 162.6 Nm/tonne |
| Power | 90 Hp @ 4000 rpm |
| Power per litre | 72.1 Hp/l |
| Torque | 200 Nm @ 1750 rpm (147.51 lb.-ft. @ 1750 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | Z13DTH |
| Engine displacement | 1248 cm3 (76.16 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 69.6 mm (2.74 in.) |
| Piston Stroke | 82 mm (3.23 in.) |
| Compression ratio | 18.4:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 3.1 l (3.28 US qt | 2.73 UK qt) |
| Coolant | 6.8 l (7.19 US qt | 5.98 UK qt) |
| Kerb Weight | 1230 kg (2711.69 lbs.) |
| Max. weight | 1805 kg (3979.34 lbs.) |
| Max load | 575 kg (1267.66 lbs.) |
| Trunk (boot) space – minimum | 380 l (13.42 cu. ft.) |
| Fuel tank capacity | 52 l (13.74 US gal | 11.44 UK gal) |
| Length | 4290 mm (168.9 in.) |
| Width | 1753 mm (69.02 in.) |
| Width including mirrors | 2033 mm (80.04 in.) |
| Height | 1415 mm (55.71 in.) |
| Wheelbase | 2614 mm (102.91 in.) |
| Front track | 1488 mm (58.58 in.) |
| Rear (Back) track | 1488 mm (58.58 in.) |
| Front overhang | 910 mm (35.83 in.) |
| Rear overhang | 766 mm (30.16 in.) |
| Ride height (ground clearance) | 140 mm (5.51 in.) |
| Drag coefficient (Cd) | 0.32 |
| 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 | Spring Strut |
| Rear suspension | Spring Strut |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 205/55 R16 |
| Wheel rims size | 6.5J x 16 |
Powertrain & Engine Architecture
The heart of the Astra H GTC 1.3 CDTI was the Z13DTH engine, a 1.3-liter inline-four cylinder diesel. This engine was part of Opel/Fiat’s joint diesel engine program, and it represented a downsized engine offering for the Astra range. It featured a common rail direct injection system, delivering fuel at extremely high pressure for improved combustion efficiency and reduced emissions. The engine was turbocharged and intercooled, allowing it to produce 90 horsepower at 4000 rpm and 200 Nm (147.51 lb-ft) of torque at 1750 rpm. The engine utilized a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The 6-speed manual transmission was the standard gearbox for this variant, chosen for its fuel efficiency and relatively smooth operation. The transmission’s gear ratios were tuned to maximize the engine’s torque output, providing adequate acceleration for everyday driving.
Driving Characteristics
The 1.3 CDTI 90 hp engine, paired with the manual transmission, provided adequate, but not exhilarating, performance. Acceleration from 0-60 mph took around 12.9 seconds, and top speed was approximately 108 mph. The engine’s strength lay in its low-end torque, making it reasonably responsive in urban driving and providing sufficient power for overtaking on highways. However, it did require frequent gear changes to maintain momentum, especially when climbing hills or carrying a full load. Compared to the more powerful 1.8-liter petrol or 1.9-liter CDTI diesel variants, the 1.3 CDTI felt noticeably slower. The manual transmission offered a more engaging driving experience than an automatic would have, but it also demanded more driver involvement. The GTC’s sporty suspension setup provided decent handling, but the relatively narrow tires (205/55 R16) limited grip in cornering.
Equipment & Trim Levels
The Astra H GTC 1.3 CDTI typically came with a fairly basic level of equipment, reflecting its position as an entry-level model. Standard features generally included air conditioning, power steering, electric front windows, and a basic audio system. Safety features such as ABS and front airbags were also standard. Optional extras included alloy wheels, upgraded audio systems, rear electric windows, and a sunroof. Interior upholstery was typically cloth, and the dashboard featured a functional, if somewhat plain, design. Trim levels varied slightly depending on the market, but generally focused on adding comfort and convenience features.
Chassis & Braking
The Astra H GTC featured a MacPherson strut front suspension and a torsion beam rear suspension. This setup provided a good balance between ride comfort and handling. The front brakes were ventilated discs, while the rear brakes were solid discs. ABS (Anti-lock Braking System) was standard, enhancing braking performance and stability. The GTC’s chassis was reinforced compared to the five-door Astra, improving its torsional rigidity and handling characteristics. The steering was a rack and pinion system, providing precise and responsive steering feel.
Market Reception & Comparison
The Astra H GTC 1.3 CDTI was generally well-received as an economical and practical option. Critics praised its fuel efficiency and low running costs, but noted its lack of outright performance. Compared to the 1.8-liter petrol version, the 1.3 CDTI offered significantly better fuel economy but considerably less power. The 1.9-liter CDTI provided a more compelling blend of performance and economy, but at a higher price point. The 1.3 CDTI appealed to buyers who prioritized fuel efficiency and affordability over driving excitement. Its lower insurance costs and road tax also made it an attractive option for first-time drivers and those on a budget.
Legacy
The Z13DTH engine, while generally reliable, has been known to exhibit issues with the diesel particulate filter (DPF) and the turbocharger, particularly if not properly maintained. Regular servicing and the use of high-quality diesel fuel are crucial for ensuring its longevity. Today, the Astra H GTC 1.3 CDTI can be found on the used car market at relatively affordable prices. It remains a practical and economical choice for those seeking a small, fuel-efficient hatchback. However, potential buyers should be aware of the potential maintenance issues associated with the diesel particulate filter and turbocharger, and ensure that the vehicle has been well-maintained.
