Ferrari first fielded the 126 C3 at the 1983 British Grand Prix at Silverstone with Patrick Tambay; René Arnoux drove it to victory at the very next race in Hockenheim. Postlethwaite retained the oversized rear wing of the 126 C2B. Over the season, the two Frenchmen took a combined four victories and remained in title contention for a long time until late mechanical failures cost both of them the championship. Ferrari won the Constructors' Championship for the second consecutive year.
Summarized from the sources cited below; every figure in the text was automatically verified against the sources.
1981
1982
1984