Technical details for the updated model were released last month, showing that it would come with a new twin-turbocharged 3.0-litre V6 engine offered in two states of tune. The first delivers 300bhp and 295lb ft, while the second offers up to 400bhp and 350lb ft, although the less powerful unit won't be available in Europe.
No CO2 or economy figures have been released, but Infiniti claims the new unit is the cleanest and most efficient V6 it has ever made. Infiniti also says the higher-output powerplant is class-leading in terms of its power-to-efficiency ratio.
Also new on the facelifted car is an exhaust manifold that's integrated into the cylinder head, reducing emissions by allowing the catalytic converter to be placed closer to the exhaust, where they heat up almost instantly. Infiniti says this also reduces weight by 5.3kg, while overall the engine is 14.1kg lighter than the V6 it replaces.
Also available in the Q50 are 2.0-litre petrol and 2.2-litre diesel engines, with the former delivering 208bhp and 258lb ft and the latter producing 168bhp and 295lb ft. A hybrid powertrain is also on offer, combining a 302bhp, 3.5-litre V6 with a 67bhp electric motor. Infiniti says the hybrid system puts performance first, with the boost in efficiency stated as an added benefit.