From recently posted set up guide:
Anti-Squat
MoreMore anti-squat generally makes the rear of the car more sensitive to throttle input.*
The car has more steering while braking, and also a little more powering out of corners.*
On high-traction tracks, it may feel as if the car momentarily has more rear traction accellerating out of corners.*
A car with more anti-squat can also jump a little higher and further, and it will soak up bumps a little better, off-power.*
A lot of anti-squat (4° or more) can make the car spin out in turns, and make the rear end break loose when accellerating.LessLess anti-squat gives more rear traction while accellerating on a slippery or dusty track.*
It also gives more side-bite.*
Less anti-squat will make the car accellerate better and faster through bumpy sections.*
Very little anti-squat (0° or 1°) makes the rear end feel very stable. It also makes power sliding a lot easier.Note that anti-squat only works when you're accellerating or braking, it does absolutely nothing when you're coasting through turns.*
The harder you brake or accellerate, the bigger the effect of anti-squat is.