In early development the car was fitted with a 4.7-litre V8 engine with fixed-vane twin turbos but it was replaced with a 5.0-litre twin-turbocharged V8 engine for the production version of the car.
The Agera is powered by an in-house developed 5.0-litre twin-turbocharged V8 engine which produces 701 kW (940 hp) at 6900 rpm and 1,100 N·m (810 lb·ft) of torque at 4000 rpm. Total weight of the engine is only 197 kg (434 lb) thanks to a carbon fiber inlet manifold and the aluminium construction. The transmission is a 7-speed dual clutch with paddle shifters.
It is the first dual clutch transmission to feature only one input shaft. The second clutch slows down the input shaft during up shifts in order to reduce the time it takes to synchronize the next gear resulting in faster shift times. Most notably the transmission weighs only 81 kg (179 lb).