That car (205 turbo) is mid-engine RWD and is rear heavy (46:54) with a very short wheelbase, sort of like a tall Lancia Stratos. You have to drive it with very smooth steering inputs because it will respond instantly to them and turn hard. If you shift too much weight too quickly by turning in too hard or fast, or being too quick on the brake release it will change direction so fast you can't correct. You steer it almost as much with the pedals as you do with the wheel.
If you try to drive it like a FWD 205 GTi, you'll just be backwards constantly.
If you start to slide a bit, stay on partial throttle (unless you just went in way too hot, in which case God help you) and when you brake.. stay on partial throttle, and brake in a straight line only. The car can carry a lot of speed if you're not sliding. If you see tire smoke you probably went in too hot. By being careful and braking early enough to not slide, you should be able to hit a good line carrying speed smoothly, get on the gas earlier, and your lap times will drop consistently even without pushing the car to its very limit. The car is much more stable when you're on the throttle accelerating away from the apex from a lower entry speed than it is trying to blitz the entry and sliding through the exit on opposite lock.
Also be very careful of lifting off the throttle too quickly, you should stay on partial throttle even if it's just a tiny amount, to keep the car stable instead of lifting. Make sure you are turning in late enough to carry the speed through without pushing wide. Slow down as much as it takes to turn in a little later on the important corners.
Some people were talking about changing their brake balance on this car to keep it from being tail happy on braking/entry, but I use 5/5.
