The fastest McLaren ever built – the Speedtail – had completed high-speed validation tests in the United States and reached its maximum speed of 403 kmph, and while we brought you that news, we had stated every single time that the company has not yet revealed any details about the Hyper-GT’s powertrain. Well, that’s done and dusted now and McLaren has revealed all the details. From a standstill to 300 kmph takes just 13 seconds before it maxes out at 403 kmph.
The M840TQ powertrain comprises a 4-litre internal combustion engine and an electric drive unit, which together develop up to 1,055 bhp and a maximum torque of 1,150Nm. The V8 engine features technology that has evolved from McLaren’s first hybrid hypercar, the legendary McLaren P1. A new lightweight air-intake system, improved cylinder head cooling and a revised piston design contribute 747 bhp and 800Nm of output to the Speedtail.
The electric motor, which uses Formula E-derived technology, generates more than 230kW. It gives the Speedtail the highest performance installation – including cooling and integration – of any electric motor currently in use on a production road car.
The high voltage energy storage system is where the Speedtail truly innovates. A high power cylindrical cell arranged in a unique array, the 1.647kWh unit is at the cutting edge of battery technology, being extremely compact and delivering the best power-to-weight ratio of any high voltage battery available today. As an indication of how McLaren technology has advanced, the power density of this battery is four times that of the unit in the McLaren P1, providing 5.2kW/kg and an output of 270kW.
The design and integration of the battery system enables the Speedtail to achieve its maximum speed by intelligent energy deployment, with these headline figures achievable because the cells are thermally controlled by a dielectrical cooling system and permanently immersed in a lightweight, electrically insulative oil which quickly transfers heat away from the cells. This system, the first of its kind in a production road car, is highly efficient and allows the cells to run harder and for longer.