McLaren has confirmed the P1′s hybrid powertrain will be able to produce 916 HP.
Powered by a mid-mounted V8 3.8-liter twin-turbo petrol engine producing 737 HP at 7,500 rpm and a peak torque of 720Nm from 4,000 rpm and working together with an electric motor generating an additional 179 HP and an instant torque of 260Nm, giving it the combined output of 916 HP and 980Nm of torque.
The driver will be able to activate the electric motor via the Instant Power Assist System (IPAS) that can be operated by a button mounted on the steering wheel. According to McLaren, this will give the P1 the throttle response of a normally aspirated engine.
Another button on the steering wheel will turn on the F1-style Drag Reduction System (DRS), which will reduce the amount of drag on the rear wing. The P1′s rear wing reduces in angle to lower drag by 23 percent. Either releasing the button or pressing the brake pedal does deactivating the DRS.
The battery will be installed on the underside of the carbon fiber chassis and will need two hours for a full charge when using a plug-in charger, which can be found in the luggage compartment. The 96 kg battery will allow the McLaren P1 to travel in electric mode for up to 9.6 km.