i've got one in my X-6 paired to an orion 7.5. very nice esc. i run the fan on the heatsink and have never had any thermalling issues - it never seems to get warm.
the timing setting does work on sensored motors - i understand that its an electronic version of advancing / retarding the timing on the motor. i always leave the motor on zero degrees timing and advance it on the speedo. as with brushed motors - advancing the motor gives more power but up to a point of diminishing return with a downside of excess heat and power consumption. i only run 3.75 degrees of advance in 2WD - any more and it gets a bit aggressive (especially with lipos)
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