▁the ▁development ▁of ▁first ▁the ▁D F Y ▁and ▁then ▁the ▁D F Z , ▁followed ▁by ▁a ▁major ▁red es ign ▁to ▁produce ▁the ▁final ▁D FR ▁type . ▁ ▁D F Y ▁With ▁the ▁introduction ▁of ▁tur bo charg ed ▁engines ▁towards ▁the ▁end ▁of ▁the ▁ 1 9 7 0 s , ▁Cos worth ' s ▁naturally ▁asp ir ated ▁D F V ▁began ▁to ▁lose ▁its ▁pre domin ance . ▁In ▁an ▁attempt ▁to ▁recover ▁some ▁of ▁the ▁performance ▁def ic it ▁Cos worth ▁designer ▁Mario ▁Il li en ▁re config ured ▁the ▁cyl inder ▁aspect ▁ratio ▁to ▁allow ▁the ▁engine ▁to ▁rev ▁more ▁freely , ▁and ▁combined ▁this ▁with ▁a ▁narrow - angle ▁val ve ▁set - up ▁and ▁Nik as il ▁Al umin ium ▁lin ers . ▁The ▁changes ▁u pped ▁power ▁output ▁to ▁~ 5 2 0   b hp , ▁but ▁this ▁was ▁not ▁sufficient ▁to ▁keep ▁pace ▁with ▁the ▁tur bo ▁cars ▁at ▁most ▁tracks , ▁and ▁it ▁was ▁only ▁through ▁a ▁mod icum ▁of ▁luck ▁that ▁M iche le ▁Al bor eto ▁was ▁able ▁to ▁take ▁what ▁would ▁prove ▁to ▁be ▁the ▁D F V - family ' s ▁final ▁F 1 ▁victory , ▁at ▁the ▁ 1 9 8 3 ▁Detroit ▁Grand ▁Prix . ▁The ▁D F Y ▁lived ▁on ▁with ▁back - marker ▁teams ▁until ▁the ▁end ▁of ▁the ▁ ▁season , ▁when ▁Cos worth ▁switched ▁their ▁efforts ▁to ▁supporting ▁the ▁new ▁tur bo charg ed ▁Ford ▁G BA ▁V 6