Timing advance?

[ejw]

Hi all

Ok in general terms can anyone give me a breakdown of what affect "timing advance" settings on my sp lpf speedo will have on motor performance.

I'm currently running an 8.5 vampire ab+ brushless motor, should I be using the timing advance at all or just be leavingbit as standard? If I use it how do you determine which setting?

Any advise greatly appreciated

Elliott