▁ 1 9 7 6 ▁Po cono ▁ 5 0 0 , ▁the ▁fifth ▁race ▁of ▁the ▁season , ▁driven ▁by ▁Al ▁Un ser . ▁Un ser ▁and ▁his ▁Cos worth - power ed ▁Par n elli ▁took ▁two ▁further ▁vict ories ▁before ▁the ▁end ▁of ▁the ▁year , ▁in ▁Wisconsin ▁and ▁Phoenix , ▁and ▁finished ▁the ▁championship ▁in ▁fourth ▁position . ▁ ▁D uck worth ▁had ▁been ▁a ▁guest ▁of ▁the ▁V els ▁Par n elli ▁team ▁during ▁the ▁Po cono ▁victory , ▁as ▁Par n elli ▁Jones ▁and ▁Vel ▁M ile t ich ▁wanted ▁to ▁establish ▁the ▁team ▁as ▁the ▁North ▁American ▁distrib utor ▁for ▁the ▁tur bo charg ed , ▁Ind y car - spec ification ▁engine . ▁However , ▁shortly ▁after ▁the ▁ma iden ▁race ▁victory ▁Cos worth ▁po ached ▁two ▁key ▁engine ers ▁from ▁the ▁Par n elli ▁team ▁and ▁set ▁up ▁facilities ▁in ▁Tor rance , ▁California , ▁to ▁develop ▁and ▁market ▁the ▁engine ▁themselves . ▁Hence for th ▁it ▁became ▁known ▁as ▁the ▁D FX . ▁It ▁went ▁on ▁to ▁domin ate ▁American ▁Ind y ▁car ▁racing ▁in ▁much ▁the ▁same ▁way ▁the ▁D F V ▁had ▁domin ated ▁Formula ▁One . ▁The ▁engine ▁won ▁the ▁Indian apolis ▁ 5 0 0 ▁ten ▁consecutive ▁years ▁from ▁ 1 9 7 8 ▁until ▁ 1 9 8 7 , ▁as ▁well ▁as ▁winning ▁all ▁US AC ▁and ▁C ART ▁champion ships ▁between ▁ 1 9 7 7 ▁and ▁ 1 9 8 7 ▁except ▁for ▁one .