Dirt Rally Tutorials #6 - Oversteer

Dirt Rally in-game tutorial about the oversteer.

SUBTITLES:

If the rear wheels of a car lose traction with the road surface while attempting to steer, the car enters a state known as "Oversteer".

This is when the angle of the car exceeds that of the steering input and the rear of the car "steps out" of line with the front.

Unlike understeer, oversteer is ofen used as a technique to increase the speed at which corners can be taken.

By proactively eliminating understeer, a higher exit speed can be achieved.

How oversteer is induced and controlled depends on the type of drivetrain in the car.

By definition, front wheel drive cars do not have any drive to the rear wheels, therefore oversteer cannot be induced by applying the throttle but can be induced by using weight transfer.

Once a front wheel drive car enters oversteer, the attitude of the car can be controlled by steering with opposite lock, accelerating, decelerating or braking.

Applying opposite lock while accelerating will effectively speed up the front of the car and will bring the rear of the car back in line.

If more oversteer is required, for example if the corner is tighter than expected, decelerating or braking will increase the amount of oversteer by maintaining the weight over the front wheels and therefore reducing the grip on the rear.

As the rear wheels of a four wheel drive vehicle are powered, you can also induce and maintain oversteer by using the throttle to spin the wheels.

Depending on the ratio of power delivery between the front and rear wheels, the car may have a tendency to oversteer more or less on corner exit.

If the ratio is biased toward the front, under acceleration the car may pull itself out of oversteer, however, if the ratio is biased toward the rear, applying power may increase oversteer by spinning the rear wheels.

Subtle control of the steering, throttle and brake is used to initiate, maintain and exit oversteer and the same weight shifting techniques apply to four wheel drive as for front wheel drive cars.

Unlike front and four wheel drive cars, rear wheel drive cars require the opposite technique with regard to throttle control during oversteer.

Oversteer can be induced and maintained by weight transfer but also by applying power to break the traction of the rear wheels.

Once oversteer has been initiated, continuing to apply power will maintain the slide.

In order to limit or correct oversteer, throttle input must be reduced.

Lift off oversteer occurs when, during cornering, you "lift-off" the throttle.

Because the car is slowed by engine braking, there will be a certain amount of longitudinal weight transfer which will unload the rear tyres causing them to partially lose traction with the road.

In a front wheel drive car, this weight transfer alone is enough to induce oversteer because the front of the car is usually heavier than the rear.

In four wheel drive and rear wheel drive cars, although the difference in the static weight between the front and rear my not be as great as a front wheel drive car, the effect is amplified by engine braking also acting on the rear wheels as they are unloaded by the weight transferring forward.

The key thing to remember is that oversteer is used as a technique to increase the speed at which corners can be taken.


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