Most of the F3 and F3000 teams have technical partners and other sponsors. Generally the drivers bring their own personal sponsors too and depending on how much money the driver brings to the team, they might get title sponsorship. I think you'll find that most teams have sponsors that look after fuel, lubrication, electrics/electronics, paintwork, etc... While not overly publicised, these all contribute to the running of a professional team.
Also ,down the pecking order, you have:
Formula Ford - Duckhams Van Diemen
Formula Vee - Stena Line Leastone
|