Boost timing is timing which is dynamically added from a set point in the RPM band. Depending on what you've set usually starts around 4500rpm in an onroad application. Usually you don't use boost in offroad. The boost timing is in addition to the can timing. So more boost = more power and heat.

What does timing on a RC motor do?

Motor Timing Explained. If you have a sensored brushless power system, you've probably noticed timing marks on the end of the motor's can. They indicate a range of stator/sensor timing that adjusts how the motor's RPM builds throughout its powerband, and you can adjust the timing to suit running conditions.

What is ESC Turbo?

ESC Turbo ( common for RC Cars )

This is a type of timing when enabled will set a predetermined amount of timing advance at a specific trigger point. This trigger point can be either based on a specific throttle input such as 100%, an RPM value or both.