My Stampede 4x4, with datalog of the Castle 3800

Pity the sidewinder sc won't do 4s

Just out of curiosity, have you tried? I was planning on adding a bec and extra cap , just to see what kind of difference it makes with it's capabilities. But was thinking when I did, I would try 4s, just to see. Honestly my end plan is a different esc, though.