The 312T was tested alongside the 312B3 at Fiorano, proving conclusively that the newer car was faster, and indeed it went on to win its next race, the non-championship International Trophy race, with Lauda at the wheel.
O 312T púxose a proba xunto co 312B3 en Fiorano, o que demostrou de xeito concluínte que o novo coche era máis rápido, e de feito chegou a gañar a seguinte carreira, a carreira non de campionato International Trophy race, con Lauda ao volante.