Hi,
finally got to testing the car with a receiver pack (and the correct screws in the diff ;). I actually mixed some of them up and put longer ones in there which made it quite a bit harder to push the car. Seems like the motor didn't really notice though.

The controller overheated pretty much as fast as before, now I measured about 95C° on the heatsink.
As expected steering worked normal during the cool off time now. I think the warrior just puts out less BEC current while thermaled. The heatshrink didn't melt this time.

I'm going to try a 12t (smaller won't fit in the chassis easily) pinion and active cooling next.

12V CPU cooler & BEC unit are installed now:
http://cx4.de/rc/storm11.jpg
http://cx4.de/rc/storm12.jpg
http://cx4.de/rc/storm14.jpg

I'm not really happy with the additional cables. ;/