AFX (also
A/FX) was the name of a line of
slot car racing sets made by
Aurora during the 1970s and early 1980s. AFX was the most popular line of "
HO"-scale slot cars during that time. Several of the AFX sets featured the likeness of racing legend
Jackie Stewart.
Through the AFX line, Aurora demonstrated such slot-car innovations as Magna-Traction, in which the motor magnets create downforce by pulling against the conducting rails embedded in the AFX tracks, enabling the cars to take corners faster; G-Plus, an enhanced version of Magna-Traction with larger magnets oriented to create greater downforce; and Ultra 5, a slotless car that uses magnets and solenoids to "sense" when the cars are drifting out of their lanes and steer them back.
While the Magna-Traction cars were effective, the G-Plus cars were a phenomenal improvement in mass-market slot-car handling for that time. G-Plus cars generated such downforce that, for many cars, it became impossible to unseat them through a curve, even at top speed.