▁D F V ▁engines ▁were ▁compar able ▁to ▁their ▁tur bo charg ed ▁oppon ents , ▁al beit ▁with ▁better ▁fuel ▁consumption ▁and ▁much ▁less ▁stra in ▁on ▁the ▁rear ▁ty res , ▁g ear box es ▁and ▁rear ▁ax le , ▁meaning ▁so fter ▁comp ounds ▁could ▁be ▁used ▁and ▁last ▁longer ▁by ▁both ▁Williams ▁and ▁Mc L aren , ▁which ▁gave ▁a ▁significant ▁benefit ▁to ▁both ▁g rip ▁and ▁ty re ▁dur ability . ▁ ▁Other ▁formula e ▁ ▁Sport scar ▁racing ▁The ▁D F V ▁was ▁used ▁in ▁sport scar ▁racing ▁with ▁some ▁mod est ▁success . ▁The ▁design ▁of ▁the ▁c rank sh aft ▁caused ▁v ibr ations ▁that ▁resulted ▁in ▁reli ability ▁problems ▁in ▁end urance ▁racing . ▁In ▁ 1 9 6 8 , ▁new ▁rules ▁for ▁the ▁Sports ▁Pro totype ▁class ▁limited ▁engine ▁disp lacement ▁to ▁ 3 ▁lit res ▁and ▁Ford ▁( UK ) ▁spons ored ▁the ▁D F V - power ed ▁Ford ▁P 6 8 ▁as ▁their ▁entry ▁under ▁the ▁new ▁rules . ▁However , ▁this ▁car , ▁and ▁its ▁derived ▁sister ▁the ▁P 6 9 , ▁failed ▁to ▁finish ▁a ▁single ▁race ▁during ▁the ▁two ▁seasons ▁that ▁they ▁competed . ▁In ▁ 1 9 7 1 ▁a ▁D F V - power ed ▁Lig ier ▁JS 3 ▁was ▁able ▁to ▁finish ▁first ▁and ▁second ▁in ▁two ▁short ▁events , ▁the ▁best ▁D F V - power ed ▁Sports ▁Pro totype ▁show ings ▁to ▁date , ▁but ▁was ▁only ▁able ▁to ▁achieve ▁a