Engine
The Aston Martin DB9 was initially launched equipped with a 6.0L V12 engine, originally taken from its sister car, the V12 Vanquish. The engine provides 569 N•m (420 lbf•ft) of torque at 5,000 rpmand a maximum power of 456 PS (450 hp) at 6,000 rpm. The DB9 can accelerate from 0 to 97 km/h (60 mph) in 4.7 seconds and has a top speed of 299 km/h (186 mph). The engine largely sits behind the front-axle line to improve weight distribution.Changes to the engine for the 2013 model year DB9 increased the horsepower to 517 PS (510 hp) and torque to 620 N•m (457 lbf•ft). The car's 0 to 97 km/h (60 mph) time decreased to 4.1 seconds and the new top speed is 295 km/h (183 mph).
The DB9 can be equipped with either a six-speed conventional manual gearbox from Graziano or a six-speed ZF automatic gearbox featuring paddle-operated semi-automatic mode.[14] The automatic gearbox increases the 0 to 97 km/h (60 mph) time to 4.9 seconds, though the top speed remains the same. The gearbox is rear-mounted and is driven by a carbon-fiber tail shaft inside a cast aluminium torque tube.