" The 919 is officially unveiled in Geneva, which means that the manufacturer is actually returning in Le Mans competition. The LMP1 car packs all latest technologies as well as extremely powerful and economical drivetrain and super lightweight chassis.
The drivetrain consists of a newly developed single-turbo V4 2.0-liter direct-injection gasoline engine working with a front axle-mounted electric motor and a lithium-ion battery pack. The V4 engine revs up to 9,000RPM and sends the power to the rear wheels, while the electric motor provides momentum for the front ones, which means a temporary AWD.
There are also two energy recovery systems – a brake energy recovery and a thermal energy recovery system incorporated in the exhaust system. This means an 8 MJ (megajoule) / lap energy recovery boost function. Actually, this is the maximum allowed under current LMP1 regulations... "