I have gone upto a 5700kv castle sensorless in the Dt02 with no huge issues.
I did buy a laser temperature gun, it did detect a large rise in temperature but it did stay in range, you would not be able to run battery pack after pack though, a cool down was required.
The hopup thick metal motor plate and motor heatsink was used also
With this much power, damp sand proved to be the best surface for running but other surfaces like tarmac responded better with wheel weights loaded on the front nose to help prevent spin outs
It was fun to push it to these limits but prolonged driving got boring because of the need to find huge spaces to run in.
Punch had to be set on zero to stop the metal drive shafts twisting and acceleration curve had to be minimised to the slowest gradient to enable control. All this happened ten years or so ago, still have no desire to revisit all that!
I've seen many cheaper brushless systems not cope with lesser situations but you get what you pay for to a certain degree!
Ps the db01 coped equally well with a castle 7700kv setup but again needed too large an environment to enjoy properly!