Opel is applying its new 1.6L SIDI Turbo gasoline engine (earlier post) in three Astra variants: Astra five-door hatchback, four-door sedan and Sports Tourer models. The 125 kW/170 hp direct injection engine leads the newly-launched Opel powertrain offensive.
This new-generation engine tops the gasoline offer in the Astra family and replaces the previous 1.6 Turbo. It generates maximum torque of up to 280 N·m (207 lb-ft)—50 N·m more than its predecessor—which is available from just 1,650 rpm (previous generation: 2,200 rpm). It also delivers 12% more torque than its closest competitors from the compact class with 150 - 180 hp output, even those from German premium brands, Opel says.
The five-door Astra, the sedan and Sports Tourer 1.6 SIDI Turbo come with next-generation six-speed manual gearboxes distinguished by especially high shifting comfort and substantially lower friction. A new, low-friction six-speed automatic transmission can also be combined with the new 1.6 SIDI Turbo engine in the Astra models. It features an Active Select function to provide manual shifting for a sportier driving experience.
With Start/Stop technology and a six-speed manual transmission, the Astra five-door and sedan 1.6 SIDI Turbo models have an NEDC combined fuel consumption of 5.9 l/100 km (40 mpg US)—14% less than their predecessors—and emit 139 g/km CO2. The five-door Astra 1.6 SIDI Turbo accelerates from zero to 100 km/h in just 8.7 seconds and reaches a maximum speed of 220 km/h (137 mph), while the sedan achieves two km/h more.
The new Astra Sports Tourer 1.6 SIDI Turbo accelerates from 80 to 120 km/h (fifth gear) in nine seconds—1.5 seconds faster than the previous 1.6 Turbo model.
To achieve low overall levels of radiated noise and vibration, engineers optimized the induction and exhaust systems. This included decoupling the cam cover from the cylinder head via specific fasteners and the sealing system. In spite of direct injection and pulsed combustion, engineers were able to substantially reduce noise levels compared to the previous engine.