My brushless HPI Nitro MT Project

[SpEEdyBL]

kt in oz/inch/amp is 1352/kv. Kt is always proportional to kv. So a higher kv motor will always have less kt. The total torque depends on the number of amps times the kt. In theory, a 540s will have slightly more torque than a 380c 6l. They both will draw about the same amount of amps, but the 8s having ~4400 kv verses the 6l having 4900 kv will have slightly more kt. Once you gear the 8s higher to compensate, both motors should theoretically have the same power output, although the 6l spools up faster in real life.