The Force India VJM02 was Force India's Formula One car for the 2009 Formula One season. Two men instrumental in the early design of the VJM02, chief technical officer Mike Gascoyne and team principal Colin Kolles, were released from their contracts in late 2008, after a conflict with team owner Vijay Mallya. The team decided late in development to change from a Ferrari to a Mercedes engine, along with McLaren gearboxes and hydraulics. Adapting to these new components required a minor redesign of several parts of the car, including the suspension, side-pods and the rear aerodynamics.
At the 2009 Bahrain Grand Prix, a revised floor and diffuser for the VJM02 were introduced, as well as an upgraded front wing and reprofiled sidepods. Driver Giancarlo Fisichella welcomed the upgrades, claiming the car's current lack of downforce will be addressed by the new modifications. The team brought further updates at the 2009 European Grand Prix, which worked very well, giving the team their first podium finish at Spa, a day after Fisichella scored an unexpected pole position.
The VJM02 had the option to feature a Kinetic Energy Recovery System (KERS), which allows energy which would otherwise be wasted while braking to be re-used in set amounts per lap, via a boost button on the driver's steering wheel. The energy is stored in either a battery or a flywheel. This is the result of new rules for the 2009 season. The VJM02 was supposed to use the same system from the McLaren MP4-24, however Force India did not use it during the season.
Source: Wikipedia (original)