Audi's WRC programme was limited for the 1985 season due to the recent defeats to Peugeot Talbot Sport, Peugeot's factory team headed by Jean Todt. Mouton and Mikkola were assigned to testing and development duties. She drove both the Sport Quattro and its follower, the Quattro S1 (Sport E2). Mouton considered the S1 the most difficult rally car she had driven: "For rallying on asphalt, I agree the limit had gone too far. We did not have the reflexes to control it properly. It was tough to drive the car, but not the short Quattro before."