Tuhia he tomokanga mō tēnei wāhanga - I te tau 1979, he nui te nui o te ahunga whakamua i mahia i roto i te aerodynamics me te wero i a Lotus, i mohio a Forghieri me whai ia i to raatau arahi me te hoahoa i tetahi waka paanga whenua mo te tau 1979. Ko te 312T4, i whakauruhia i te 1979 South African Grand Prix
I tino pātata ki te 312T3. Ko ona putake i whakaiti i te hoahoa aerodynamic mai i te raupapa T kaore i hangaia me te painga o te whenua. I hangaia te monocoque 312T4 kia iti rawa, kia pai ai te painga o nga paanga o te whenua, engari i aukatihia tenei e te whanui o te miihini papa 12.