Re: Drivers, start your engines!
You might consider Tactics, various flavors of Analyze, some sort of Gadeteering or the like for improvising some sort of equipment change in the pit stop..?
Before the race, you could use Acting, Seduction, various flavors of Analyze, Gambling, Streetwise, Contacts, or (of course!) roll playing some encounters among the various drivers and crew members. All this could add to or subtract from the starting rolls. Teamwork might allow something like dirty tricks if you've got more than one car on the course for each team...