Magic carpet
From Stunts Wiki
This is the expression used for when your car makes a spontaneous jump from flat ground. Magic Carpets are an unpredictable wildcard in competition races, as they usually allow the pipsqueak to save time by keeping a higher speed, sometimes even reaching or keeping power gear where it would not otherwise be possible. The random nature of magic carpets makes them hard to use and an unpredictability factor, sometimes allowing weaker pipsqueaks to beat stronger pipsqueaks.