His first year in the BTCC was 1994, when his car was quite distinctive, driving a Volvo 850 Estate, when it was normal to race saloons. The TWR team switched to a saloon in 1995 and Rydell took pole for 13 of the 24 races, but due to several slow starts he won only 4 times and he finished on podium 7 times. At the end of the year he was third in the championship, a result repeated in 1996 although Audi dominated with Frank Biela he was able to score 4 victories and 6 podium. In 1997 Volvo switch from 850 saloon to new model Volvo S40, at the end of year he was fourth with 1 victory and 5 podium. In 1998, he finally won the BTCC title in a Volvo with 5 victories and 12 podium, beating Anthony Reid at the final meeting. He also won the 1998 Super Touring Bathurst 1000, sharing a Volvo S40 with Jim Richards.