ations ▁for ▁his ▁revolution ary ▁car ▁called ▁for ▁a ▁rear ▁engine , ▁a ▁low - R PM ▁ 5 8 9 ▁cub ic ▁in ch ▁engine ▁with ▁hyd ra ul ic ▁val ves ▁instead ▁of ▁a ▁cam sh aft , ▁fuel ▁injection , ▁direct - drive ▁tor que ▁conver ters ▁on ▁each ▁rear ▁wheel ▁( inst ead ▁of ▁a ▁transmission ), ▁disc ▁bra kes , ▁the ▁location ▁of ▁all ▁instruments ▁within ▁the ▁diameter ▁and ▁reach ▁of ▁the ▁ste ering ▁wheel , ▁a ▁p added ▁dash board , ▁self - se aling ▁tub eless ▁t ires , ▁independent ▁spring less ▁susp ension , ▁a ▁ch ass is ▁that ▁protected ▁occup ants ▁in ▁a ▁side ▁impact , ▁a ▁roll ▁bar ▁within ▁the ▁roof , ▁a ▁l amin ated ▁wind sh ield ▁designed ▁to ▁pop ▁out ▁during ▁an ▁accident , ▁and ▁a ▁center ▁" cyc lo ps " ▁head light ▁which ▁would ▁turn ▁when ▁ste ering ▁at ▁angles ▁greater ▁than ▁ 1 0 ▁degrees ▁in ▁order ▁to ▁improve ▁visibility ▁around ▁corners ▁during ▁night ▁driving . ▁ ▁While ▁most ▁of ▁those ▁innov ations ▁made ▁it ▁to ▁the ▁final ▁ 5 1 ▁pro tot ypes , ▁several ▁were ▁dropped ▁for ▁their ▁cost ▁and ▁the ▁lack ▁of ▁time ▁to ▁develop ▁such ▁mechan ically - comp licated ▁designs . ▁The ▁low - R PM ▁ 5 8 9 - c ub ic - inch ▁engine , ▁individual ▁tor que ▁conver ters , ▁mechanical ▁fuel ▁injection , ▁and ▁the ▁disc ▁bra kes ▁were ▁all ▁dropped ▁during ▁the ▁design ▁and ▁testing ▁phase