There are probably about 20 different variables that make a big difference in timing. First and most important is battery cell count. 1 cell racing requires a different strategy than 2 cell. To make it as simple as I can. 1 cell tune to 3 to 4 amps. 2 cell around 5 to 6. Actually timing will vary with different rated rotors (strength). I weaker rotor will require more actually timing where as a strong rotor needs less timing. Once you are getting the most out of motor then gear to track.