Hot ESC, But Apms Are Below Rating?

[mmdooley]

It sounds like it is over geared. Go up on the pinion or down with the spur. If the batteries get hot then go back the other way. Under geared= hot esc, over geared= hot battery

[Gustav]

undergeared would be hot motor,cooler esc and batteries.

It could be a tad overgeared for general driving,maybe drop to a 20/66 but your main problem is the grass.Try it again with a low rolling resistance (gravel or tarmac)and the temps and amp draw will be dramatically lower.Run a much lower gear on grass.

Edit;does the esc get plenty of air cooling? it will have plenty of heat to dissipate at 115A/14.8v.

Another edit;just a thought but the switching frequency affects the controller efficiency and schulze recommend 9 KHz part load switching frequency for lehner/hacker motors above 8 turns and 19kHz below 8 turns.the quark is fixed at 38kHZ according to the specs.I hope that's nothing to do with the heat.