Car set up tips.

This setup guide assumes you have some sort of 'standard setup' to
begin with. One should come with your kit. You can also find standard
setups on manufacturers' websites.
It also assumes your car is in
perfect working order. (Bearings spinning freely, nothing dragging the
ground, no binding in the suspension,...)Tires

Tires are always the first element in setting up a car. If you've got the right tires and inserts, you're 99% there.

Caster

Caster is a very sensitive adjustment! Adding or removing a few degrees of caster can transform the steering balance of a car.

More	More caster aids stability, especially at high speeds. More caster generally suits large, open, high-speed tracks.
Less	Less caster increases steering drastically. Steering feels much more direct, the car turns tighter and faster. Small amounts of caster are suitable for tight tracks.

Toe

Rear Toe-in	This is one of the most sensitive adjustments! One degree goes a long way. Stabilizes the car greatly. It makes the rear end 'stick'. The more toe-in you use, the more the rear of the car sticks. This is especially apparent going into and coming out of turns. But more toe-in makes the difference between sticking and breaking loose bigger. Large amounts of toe-in (2.5 ... 3 degrees) scrub off a little speed in the straights.
Rear Toe-out	Rear toe-out is never used. It makes the rear of the car very, very unstable.
Front Toe-in	Stabilizes the car in the straights, and coming out of turns. It smoothes out the steering response, making the car easy to drive. It can make the car turn a little more in the middle and exit parts of a turn.
Front Toe-out	Increases turn-in steering a lot. But can make the car wandery on the straights. Never use more than 2 degrees of front toe-out!

Camber

Camber is best set so the tires' contact patch is as big as possible at all times. So with a stiff suspension and firm tires you'll need less camber than with a soft suspension or tires with big, flexible sidewalls. If the tires wear evenly across their contact patches, camber is about right.

Pinion/Spur

Smaller Gear Ratio (bigger number means smaller ratio)	More punch and accelleration. More runtime. Lower top speed.
Bigger Gear Ratio (smaller number means bigger ratio)	Less punch, but more top speed. Less runtime.

Smaller Pinion Gear	Smaller gear ratio
Bigger pinion Gear	Bigger gear ratio
Smaller Spur Gear	Bigger gear ratio
Bigger Spur Gear	Smaller gear ratio