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Originally Posted by BrianG
I take it you're running 4s? That's a pretty good total gear ratio (15.3:1) considering it's a buggy. Ratios in the range of 9:1 to 11:1 are more common so it's not a gearing issue. It sounds like the 7xl is simply pulling enough average current to heat up the ESC quickly. Can't forget the MM is a 10th scale ESC meant for lighter duty use and smaller motors, so you might just be stuck using a fan or adding more heatsink area.
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Brian thank's for your repliy. I purposly did not use a fan for this test to see how long i could get, & i got about 8 1/2 plus minutes. Know i will hook up the fan & see how long i get . I'm running 14 cells. If it's the motor What fiego motor would you suggest ?.