The Vauxhall Astra Mk VI GTC 1.7 CDTi, produced from 2011 to 2015, represented a compelling entry point into the sporty GTC (Gran Turismo Coupe) variant of the Astra lineup. Positioned as a fuel-efficient and relatively affordable option, it catered to buyers seeking a stylish three-door hatchback with decent performance and modern features. This model sat within the J platform, specifically the A04 generation, and played a significant role in Vauxhall’s (and Opel’s, its sister brand) strategy to offer a diverse range of Astra configurations to appeal to a broad customer base in the European market. The 1.7 CDTi engine, while not the most powerful in the GTC range, provided a balance between economy and usability, making it a popular choice for everyday driving.
Technical Specifications
| Brand | Vauxhall |
| Model | Astra |
| Generation | Astra Mk VI GTC |
| Type (Engine) | 1.7 CDTi (130 Hp) |
| Start of production | 2011 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (urban) | 5.2 l/100 km (45.2 US mpg, 54.3 UK mpg, 19.2 km/l) |
| Fuel consumption (extra urban) | 4.1 l/100 km (57.4 US mpg, 68.9 UK mpg, 24.4 km/l) |
| Fuel consumption (combined) | 4.5 l/100 km (52.3 US mpg, 62.8 UK mpg, 22.2 km/l) |
| CO2 emissions | 119 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 10.8 sec |
| Acceleration 0 – 62 mph | 10.8 sec |
| Acceleration 0 – 60 mph | 10.3 sec |
| Maximum speed | 196 km/h (121.79 mph) |
| Weight-to-power ratio | 10.2 kg/Hp, 98.4 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 227.1 Nm/tonne |
| Power | 130 Hp @ 4000 rpm |
| Power per litre | 77.1 Hp/l |
| Torque | 300 Nm @ 2000-2500 rpm (221.27 lb.-ft. @ 2000-2500 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | A17DTS |
| Engine displacement | 1686 cm3 (102.89 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 5.4 l (5.71 US qt | 4.75 UK qt) |
| Coolant | 7.1 l (7.5 US qt | 6.25 UK qt) |
| Kerb Weight | 1321 kg (2912.31 lbs.) |
| Max. weight | 1881 kg (4146.9 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space – minimum | 371 l (13.1 cu. ft.) |
| Fuel tank capacity | 56 l (14.79 US gal | 12.32 UK gal) |
| Length | 4466 mm (175.83 in.) |
| Width | 1840 mm (72.44 in.) |
| Width including mirrors | 2020 mm (79.53 in.) |
| Height | 1489 mm (58.62 in.) |
| Wheelbase | 2695 mm (106.1 in.) |
| Front track | 1585 mm (62.4 in.) |
| Rear (Back) track | 1588 mm (62.52 in.) |
| Minimum turning circle | 11.4 m (37.4 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 6 gears, manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
Powertrain & Engine Architecture
The heart of the Astra Mk VI GTC 1.7 CDTi is the A17DTS engine, a 1.7-liter inline-four cylinder diesel. This engine is part of Vauxhall/Opel’s ‘family’ of small-capacity diesel engines, known for their efficiency and relatively low emissions. The A17DTS utilizes a common rail direct injection system, delivering fuel directly into the combustion chamber at extremely high pressure. This, combined with a variable geometry turbocharger and intercooler, allows for a good balance of power and torque. The engine features a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, optimizing gas flow for improved performance. The six-speed manual transmission was the standard offering, providing a good spread of gears for both acceleration and highway cruising. The transmission’s ratios were tuned to maximize the engine’s torque output, providing reasonable acceleration despite the relatively modest horsepower figure.
Driving Characteristics
The 1.7 CDTi-equipped GTC offered a comfortable and economical driving experience. While not a performance-oriented variant, the 130 horsepower and 300 Nm (221 lb-ft) of torque provided adequate power for everyday driving situations. Acceleration from 0-60 mph took around 10.3 seconds, which was competitive for its class. The engine’s torque curve was relatively flat, meaning that usable power was available across a wide rev range. This made overtaking and merging onto highways relatively effortless. Compared to the more powerful 2.0 CDTi models, the 1.7 CDTi felt less strained at higher speeds, but lacked the outright punch for more spirited driving. The manual transmission offered a precise and engaging shift feel, enhancing the driving experience.
Equipment & Trim Levels
The Astra Mk VI GTC 1.7 CDTi typically came with a reasonable level of standard equipment. This included air conditioning, electric front windows, a CD/MP3 stereo system, and alloy wheels. Higher trim levels, such as ‘Sport’ or ‘SE’, added features like climate control, upgraded upholstery, parking sensors, and a more comprehensive infotainment system. Optional extras included a panoramic sunroof, leather seats, and a navigation system. The interior design was generally functional and well-built, with a focus on ergonomics and practicality. The GTC’s three-door body style offered a slightly more sporty and youthful appeal compared to the five-door Astra hatchback.
Chassis & Braking
The Astra Mk VI 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 GTC’s chassis was slightly stiffer than the standard Astra hatchback, enhancing its cornering ability. The braking system consisted of ventilated discs on the front wheels and solid discs on the rear. Anti-lock Braking System (ABS) was standard, providing enhanced safety during emergency braking situations. The steering was electrically assisted, offering a light and precise feel.
Market Reception & Comparison
The Astra Mk VI GTC 1.7 CDTi was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and stylish design. However, some critics noted that the engine lacked the outright performance of its rivals. Compared to other trims in the Astra lineup, the 1.7 CDTi offered the best fuel economy and was the most affordable option. It appealed to buyers who prioritized practicality and running costs over outright performance. Against competitors like the Ford Focus, Volkswagen Golf, and Peugeot 308, the Astra GTC 1.7 CDTi offered a competitive package in terms of price, features, and fuel efficiency.
Legacy
The A17DTS engine, while generally reliable, is known to have some potential issues, including problems with the diesel particulate filter (DPF) and the turbocharger. Regular maintenance, including oil changes and DPF regeneration, is crucial to ensure long-term reliability. Today, the Astra Mk VI GTC 1.7 CDTi can be found on the used car market at relatively affordable prices. It remains a popular choice for buyers seeking a stylish, economical, and practical hatchback. Its fuel efficiency and relatively low running costs continue to make it an attractive option for those looking for a dependable and affordable vehicle.
