Ellis and Nick are testing these brushless outrunners with these esc's
Low KV combined with sensored start up.
And yes, finding a car esc for 5S is difficult with Hobbyking. I think only the high amp 5/1 scale can do the job.
I got this one for Kashei's axe, to be mated with an NTM5060 380KV
But in Nebelwerfer, Perun and Hannibalito 3.2 we use 3S capable Trackstars.
That was also the reason why Caliope had a dual batterypack. 3S 2200mAh for drive, and 5S 5000mAh for the weapon.