I used to race - karts can reach fantastic speeds, but it's not so much the speed but the way in which you can corner at high speeds.
Like SD says it's all about the set up so I believe it is the best way to understand cars.
I got in to it with a good friend who's parents were friends of my parents

and we both ended up racing in amateur leagues, but then I gave it up to pursue moto-x and then road racing on bikes.