The driver is the most important piece of the puzzle when it comes to autocrossing. A fast car helps, but without a competent driver, that fast car, will end up having slow times around the course. Here are a few tips.
Look ahead! Look at where you want to go, not what you want to miss (i.e. the cones)
Be smooth on the gas, on the brakes, and with the steering wheel
Go slow to go fast. Don’t take the tight sections too fast.
Brake hard! Use your brakes HARD to slow the car, that’s what they’re for.
Launch at higher RPM’s than you’re used to, but try to limit wheel spin.
Limit gear changes. On most courses, get it into 2nd gear and leave it there. Some courses, and some cars, will require downshifting, but if you’re new to the sport, get it into 2nd and leave it there so you can concentrate on other things – you’re gonna be busy in the car!