rFactor

rFactor is a computer racing simulator, designed with the ability to run any type of four-wheeled vehicle from street cars to open wheel cars of any era. rFactor aimed to be the most accurate race simulator of its time. Released in November 2005, rFactor did not have much competition in this market; however it featured many technical advances in tire modeling, complex aerodynamics and a 15 degrees of freedom physics engine.

rFactor was developed by Image Space Incorporated (ISI), which has been developing simulators since the early 1990s for both commercial and military purposes. The gMotor-engine2 on which the game is based is a direct successor to the engine used in previous titles developed by ISI, most notably F1 Challenge '99-'02, released through EA Sports. The gMotor2 engine was also used in many Simbin games, including GT Legends, the GTR series and the Race series. A modified version of this engine was utilized by The Sim Factory for ARCA Sim Racing. A special version of rFactor was available for business application, for example for event simulators or promotion.

Modifications In addition to the stock vehicles and circuits available in rFactor, a steady stream of unofficial mods has become available. One of the earliest mods was F3 vehicle mod, which became very popular for some time and was later officially included in the game, although with fictitious branding. Many more modifications were released, including ones that recreated seasons from Formula One, NASCAR, IndyCar and V8 Supercars. With the release of the SDK many new venues were created and released as unofficial addons to the game. Many of the circuits for rFactor were converted from other games, including GTR, GT Legends, TOCA Race Driver, Grand Prix 4 and GP Legends.