Rally cars are primarily banned for two reasons: posing extreme danger to participants, or gaining illegal performance advantages. The most significant ban was the 1986 termination of Group B, following fatal crashes involving the Lancia Delta S4 and Ford RS200. Another famous case is the 1995 Toyota Celica GT-Four, banned for a hidden turbo restrictor bypass.
The Group B era (1982-1986) represents the most famous category of banned rally cars. Dubbed a "golden age" for engineering freedom, it produced vehicles with power outputs exceeding 600 horsepower. The lack of adequate safety regulations for such speeds led to multiple driver and spectator fatalities. Market data indicates that by 1986, the escalating danger made the category unsustainable, prompting the FIA to cancel it entirely.
Key models banned with Group B's dissolution include:
- Lancia Delta S4: Involved in a fatal crash during the 1986 Tour de Corse, directly contributing to the era's end.
- Ford RS200: Was involved in a major spectator-fatal accident at the 1986 Rally of Portugal.
- Audi Sport Quattro S1: Epitomized the era's extreme speeds and forced a reevaluation of safety in the sport.
- Peugeot 205 T16 & MG Metro 6R4: These were dominant, technologically advanced machines that defined the dangerous period.
Separate from safety bans, cars have been prohibited for technical regulation breaches. The most notable is the Toyota Celica GT-Four (ST205), which received a 12-month competition ban in 1995. The FIA discovered an illegal secret mechanism within the turbocharger that bypassed the mandatory air restrictor, providing an unfair power advantage. This was considered a deliberate act of cheating through engineering.
Other technical bans include the Lancia Stratos HF, which was eventually restricted due to homologation loopholes, and later World Rally Cars like the Subaru Impreza and Mitsubishi Lancer Evolution, whose dominance led to sweeping regulation changes to maintain competitive balance. These cases show that bans are not always about outright danger but also about preserving the sport's integrity and fairness.
