Both, Car and Controler must be switched off for loading.
I had a few dragster races with my proportional and ****ed off all others - zipzap, bitchar.
Stearing motor is now 2.2 the bigger ones (i tried 3.0 and 3.8) are to fast and make problems with stearing.my car now completely has mosfets that make te accelaration a lot better and more powerful. For highspeed 3.8 Motor as i already said and now also the fastes BiitcharG gearset
I also tried a propo with a 3.6V Lipo batterie and standard motor but didn't liked it - you cant go slow - speed is no more so good adjustable while top speed also cant reach my one
The yokomo has even better stearing and goes really silent and smooth. but its not that modable and its ugly

the electronic in the yoco is high and you cant put a lower body on the chasis. it will always look like a mini van --> family car.