Yeah, you're right, I've never done speed runs with a rig as big as what you're using so I can only draw on my knowledge of electronics, 1/10 scale speed runs, and RCs in general but its not exactly rocket science. Put the biggest kV motor in it ya can with the shortest gearing and best battery you...
The 3930 is a 6S motor. I didnt realize you were running 8S in your limitless or Id have recommended the TP 4070-SCM (2950KV, 8S). Theyre all gonna get hot when you're doing speed runs so I'm not sure why thats a concern. Do you want efficent or do you want to break speed barriers? If you're...