[sleebus.jones]

Originally Posted by lutach

Now days I'm getting more and more confusing as some companies say to run low timing to keep temps down. I always go mid or 5 degrees of timing for 4 pole motors and high or 10+ degrees for 6 pole motors.

Very interesting, because that's what I've always heard too:

Originally Posted by Bernie Wolfard

All Castle Creations speed controllers provide dynamic timing advance. This means the advance setting changes with speed and load on the motor to maximize the efficiency of the motor as all speeds. Changing the timing advance setting lowers or raises the range in which timing advance moves. The advance settings actually overlap quite a bit.

Generally, outrunner motors work best with high timing advance. However, one of the motor characteristics CC ESCS compensate for is motor inductance. The high inductance of outrunners pulls timing advance up. This means that for most medium to small outrunners 'Standard' timing advance works well. With these the only reason to lower timing is if the motor is running too hot or if it starts making noise above half throttle. The noise means the ESC is loosing sync with the motor.

With larger outrunners we recommend 'Low' timing advance. The larger the outrunner the higher its inductance. These larger motors inductance pulls our ‘Low’ timing advance up to the higher timing advance these motors want without having the advance get so high that the ESC can no longer sync the motor.

Hope this helps.

Bernie

And the followup:

Originally Posted by Bernie Wolfard

The difference between medium/small is somewhat subjective as different motors behave somewhat differently. When I wrote the above I was thinking about AXI motors where anything below the 4100 sized would be medium/small, 4100 and up would be large.

However, if you have a large 2800 series motor that makes noise over half throttle lower the advance. It is also a good idea, if you like to fiddle with things, is to change timing between 'Low' and 'Standard' and see if full throttle produces more or less RPM.

To make it easy, as long as the motor is behaving OK don't change timing. If it is making noise at higher throttle settings or running too hot lower timing.

Bernie

I realize this is about outrunners, and we've been discussing inrunners, but I'd like your thoughts/experience too.

I've only goofed with timing on a outrunner I've got. I never tried higher timing with it, because it got pretty darn warm just on normal, and changing to low (or lowest) didn't help at all. The motor I was trying was a Axial 600XL, now I'm wondering if higher timing might be worth a shot?