Because of the need of organizers for a car capable of keeping up with F1 cars on the opening race, the then T-623 was further developed into the 2-seat, lightweight and more powerful T-623 R. It led to a fleet of eight cars being used in Formula One as the safety cars at the inaugural 1986 Hungarian Grand Prix. The latest Hungarian Grand Prix that T-623 R took part in was held in 1995, where Taki Inoue was hit by the car.