here is a good way to induce oversteer that is used by racing drivers to bring the rear round on a car understeering mid corner:
First you will need a RWD car, and second you need to invest in adjustbale brakes. Power doesnt matter. Set the brake balance so all the brakes are on the front. Then when you come to the corner, brake and accelerate at the same time. if you can control the balance between power and brakes you will drift perfectly!