Instant Power Assist System delivers instant torque boost
McLaren has revealed the details about the P1's hybrid 'Twin Power' powertrain prior to its world debut at the 2013 Geneva Motor Show next month. The new supercar from McLaren will be powered by both a mid-mounted 727bhp 3.8-liter twin turbo V8 engine and a 176bhp electric motor for a combined output of 903bhp and a maximum torque figure of 900 Nm.
The 3.8-liter V8 engine used on the McLaren P1 is an updated version of the M838T unit that has been upgraded to improve its cooling and durability. It also has a unique casting on the engine block to accommodate the electric motor. The lightweight electric motor can instantly deliver an additional 260Nm of torque to increase throttle response.
To compliment the 'Twin Power' system, McLaren devised the Instant Power Assist System(IPAS) to instantaneously add boost and the Formula 1 derived Drag Reduction System(DRS) to reduce the amount of drag by up to 23% by adjusting the wing angle, both of which can be activated via the buttons on the steering wheel.
While the electric motor is primarily there to add power to the V8 engine, the P1 can also run solely using this engine for a virtually silent and zero emission operation for a range of more than 10km before the high power density battery pack needs to be recharged by the petrol engine.