come 1969, he was employed by autodelta, the competition department of alfa romeo. he was hired to help development their sportscars and race in the european touring car championship. amongst other he teamed up with was ignazio giunti and nino vaccarella. during this period, carlo finished third in the spa 24 hours twice. in 1973, he was racing the team's alfa romeo t33/tt in the world championship for makes. after switch co-drivers in 1974, he was now partnered by andrea da adamich. this resulted in him visiting the podium on four occasions, the best being second in the 1000 km österreichring. by the end of the season, autodelta had finished fourth in the overall standing, but facetti collaboration with alfa romeo was over, after winning the italian title. "[he] was going through a period of crisis: [he] worked a lot with little satisfaction on a personal level. however, [he] won the italian title, but that does not stop [him] from leaving autodelta. as [he] ran at the mugello circuit, cesare fiorio tells [him], 'i have to tell you about an interesting program… a few days later, [he] was in fiorio office, offered [him] the development of the engine for the stratos. [he] would be working with mike parkes, to give the engine fuel injection and 4-valve head."