With this success in Formula 3, Busi decided to attempt International Formula 3000 for 1992 with Piemme Motors, although this did not turn out well for him. That season he did not finish a single race, ending up not being classified in the standings. After this attempt he did not return to open-wheel racing and focused on touring cars.[citation needed]
Japanese Touring Car Championship (1994-1995)
After taking a break in 1993, Busi returned to racing with the Unicorse team in 1994, driving an Alfa Romeo 155 under the newly adopted Super Touring regulations. Despite only competing in the last six rounds and only qualifying for four of them, he managed to get 8 points with a 4th place finish at the Sendai Hi-Land Raceway during Round 16 of the championship. For 1995 he stayed with the Unicorse team but only competed in two rounds, both held at the TI Circuit Aida, placing 10th and 13th respectively.[3]
Italian Superturismo Championship (1996)
For 1996 he returned to Italy, competing in the Italian Superturismo Championship with the Motortrend team with a Peugeot 405. His only race finish that year also happened to be the race he scored his only point, with a 9th place at the Mugello Circuit.[3]
Spanish Supertouring Championship (1996)
Also in 1996, Busi raced an Opel Vectra GT in the Spanish Touring Car Championship for the last two rounds, only finishing one race in 16th.[3]