Crt.5 brushless overheating

[BrianG]

Wow, I see.

Well, I'm not sure about what cap you are wanting to add.

Do you mean a "glitchbuster" cap to help the BEC cope? If so, that won't work; all it will do is help even the load (smooth out the current spikes). And with tires that big, there is quite a load on the steering servo and BEC. Plain and simple: you need a switching one.

Or, do you mean extra caps on the power lead to augment the existing 3 caps on the ESC? If so, that may help (certainly won't hurt), but I wouldn't expect miracles.

I think your best bet would be to get a UBEC and possibly gear down a tooth or two. A 2700kv motor on 3s is only ~29k rpm, which a bit on the slow side. The ESC may simply be pulling a decent amount of current to retain 35mph speeds. With that motor and tire size, I'd go 4s and gear to 11T or 12T on the pinion. But at 4s, a UBEC is required.