We have covered the history of Technic cars a long time ago (see part I, part II and part III).
Now Eric Albrecht (also known as Blakbird, author of Technicopedia) did the same on the in the guest post of the official LEGO Technic blog:
The history of LEGO "Super Cars" is even longer than the Technic line itself, beginning in 1977 and running right up to the present day. There is no official definition of Super Car and therefore different fans might include different models on their own list. Most fans consider a Super Car to be one of the large scale automotive models which attempt to maximize realistic function as much as possible. Over the years, the models got more and more functionally realistic, and the complexity peaked in about 1994. Since then, subsequent supercars have become more realistically styled without adding a lot of complexity.