Originally Posted by Casper

Things like sub trim and EPA are used to adjust your cars servo to center and adjust the left and right throw to get max steering from your car left and right.

EXPO is something some play with for throttle as it can give more punch for stock on high traction or help with getting the car rolling out of a corner in low traction.

Drag brake. Depends on the car. For 4X4 SC the trucks tend to have plenty of natural drag due to all the moving parts we tend to turn this off but for something like a 2wd buggy or TC this can be a great tuning aid to help the car naturally slow down for some corners and can be much more conisistant then relying on using the trigger. All things you need to experiement with so you can see how it effects things so you know when you get into certain situations you can make adjustments to help.