Just a quick update, I have managed to increase the speed and it is much more fun, however I ran out of time last weekend to refine the physics and AI to handle the changes. I'll put up an update this weekend once I've got things running smoothly.
Okay I finally got a new build up which has faster cars and slightly more interesting AI, however there's a whole lot I'm not happy with. The sound for one didn't seem to like the Unity upgrade so I'd suggest turning the volume way down, and for some reason the gamepad doesn't want to work in the WebGL build which makes it really hard to drive with keys. Have a go and let me know if you agree.
All good, it's been quite fun to revisit an old game. The cars in theory have the same specifications but the AI cars don't use full throttle or else you'd never keep up with them. The real solution is to have rubber banding, where they slow down when they get too far in front, and speed up when you get too far ahead. This keeps the racing close and much more fun. I'll see if there's something quick and easy that I can do here to put something basic in place.