Pit Stop is a 1969 film directed by Jack Hill and starring Brian Donlevy and Richard Davalos.
Rick, a brash, hustling, opportunistic amateur drag racer, is courted by affluent Grant Willard, who wants him to participate in his burgeoning Figure 8 stock car racing competitions, where the driving pattern guarantees crashes and injuries.
Rick quickly starts trying to undermine a popular star of Willard's races, Hawk Sidney, who is prone to over-the-top boasting and taunts.
Rick then sets his sights on besting the comparably calm and conservative champion Ed McCleod, whose wife Ellen frequently helps with the upkeep of his car, but is clearly feeling neglected.
When Rick arrives there, he learns that by walking to the ambulance under his own power, instead of allowing paramedics to handle him, lingering whiplash from the wreck broke Ed's neck, and he has died.