Boost timing is applied across the whole of the throttle range,
Turbo timing is applied at full throttle or a set rpm (dependent how you have set it in the ESC)
Although boost timing is applied across the whole of the throttle movement it can be set to come in aggressively or smoothly.
in Simple terms for an aggressive setting the start rpm and end rpm are close together this adds the timing in quicker, it can be fined tuned by the slope (degrees or secs of timing added higher degrees or lower secs will add timing quicker)
This type of setting will also increase the heat in the motor quicker.
for a smoother introduction of the timing have a greater distance between start and finish rpm. to fine tune do the opposite of above.
Start rpm depends on car ,track ,gearing.
If you start running boost & turbo lower your gear ratio (higher number i.e. go from 4.5 to 6.6 ratio)
ALWAYS Temp your motor after 2, 4 mins to ensure you do not burn out the motor see the instructions that came with your motor for the max temp they advise!
Best explanation of all the settings and how they work is probably in the Hobywing manual
http://www.petitrc.com/reglages/hobb...nV3_Manual.pdf