It is all down to setup. In LFS we generally use locked differentials for fwd cars, whilst is actuality, open differentials are generally used in fwd road cars.
A locked differential causes a fwd car to understeer off power, and 'oversteer' on traction. This is because a locked diff causes both tyres to always spin at the same speed, but not to always receive the same amount of torque.
On corner entry (presuming 0% throttle so 0% input torque) this causes understeer because the inside wheel is spinning too fast for the radius of turn it is trying to do (or conversely, the outside wheel is spinning too slowly). On throttle this causes 'oversteer' because more force is produced at the outside tyre because it has more weight on it. (F=mu*N). In reality obviously this is limited by the max grip of the tyre.
In a normal road car, it will use an open differential. This means that the wheels are allowed to spin at different rates, but will always receive 50% of the torque. This means that, on entry, the outside wheel is allowed to spin faster than the inside wheel, causing the oversteer (it will spin faster because it is travelling farther). The car will then understeer on throttle because the inside tyre will spin faster due to there being less weight on it.
Feel free to tell me that I'm wrong or that I'm shit at explaining things.