• A higher power side number will result in better traction out of corners and power understeer
• A lower power side number will result in worse traction out of corners and power oversteer.
• A higher coast side number will result in better braking and understeer off the throttle.
• A lower coast side number will result in worse braking and lift off oversteer

The power side needs some qualification: A higher power side does indeed produce some power understeer, but only as long as the engine is not strong enough (or you're very light on the throttle) to spin the rear wheels. When you get the rear wheels to spin, with a high power side number, you will get SNAP oversteer! This is because BOTH wheels will then start spinning at the same time.

With a lower power side number, less horsepower is needed to spin the rear wheels, so in that respect it can give you oversteer, BUT one of the wheels (the inside one) will start spinning a lot earlier than the other, and that will not bring nearly as MUCH power-oversteer as TWO spinning wheels does.

So, a higher power number leads to more power understeer, up to a point when it all snaps sideways. A lower power number leads to a little more initial power oversteer, but makes the ensuing powerslide a lot more controllable as you apply more power than the rear tires can handle.

It’s possible to get an idea of how your differential settings are working by looking at the Oversteer Graphical Analysis Template. If you’re getting a large wheel slip figure accelerating out of a corner then your power side differential may be set too low as the wheels aren’t locked together tightly enough. If you’re getting a large wheel slip figure braking or off the throttle then your coast side differential may be set too low. The main criteria is how the car feels however.

Preload decides how quickly the transition between power and coast differential effects occurs. This controls how your car feels on part throttle (Roughly between 1% and 40% throttle). This is useful for deciding how responsive you want the power when you’re braking or off the throttle completely only the Coast differential figure affects the feel of the car. Above 40% a low preload value will result in a car that’s easier to control and will give a gentle transition between braking and accelerating as well as when you re-apply the throttle. This is useful for powerful cars making it easier to accelerate from a high preload value will result in a more responsive throttle pedal making it easier to adjust the cars line mid corner. Small movements on the accelerator allow you to balance the car and hold it on the limit of traction. The downside is that the effects are harsher than with a lower preload value making the car less stable and easier to spin at low speed when you re-apply the throttle after a braking zone or on corner exit. It’s also easier to break the rear tyres loose if you lift off the throttle too quickly.