Board Thread:Game Discussion/@comment-34685876-20180316091225/@comment-26829117-20180316101424

Basically, the assists work like this:
 * SA - modifies your steering to try and keep you on the optimum racing line (as far as the game is concerned). It doesn't really slow you down but it can make you skid or seem to fight against you in some corners. SA High can be a real pain when you are off track as it gets confused.
 * BA - applies the brakes for you if you don't do it soon enough. BA high brakes far too much and makes you slow, BA low sometimes doesn't brake early enough and makes you go off track. Again, BA assists assume you are trying to stay on what the game thinks is the optimum racing line and will get it wrong if you take a different line
 * TC - stops you applying power too early and prevents the car from skidding. It slows you down a lot. Turn it off.
 * SS - this doesn't affect your speed at all but it does affect how hard you have to turn your device to turn the car. 0 - car turns slowly, 10 - car turns quickly. Use 0 for more control, 10 for more fun.