I had one that burst into flames! The speedo overheated melting the wire insulation which in turn then shorted the batterys out!
I went around a corner planted the throttle and the car started smoking badly, the marshall set it up on the stage. I took the bodyshell off and the car burst into flames so I ran outside with it and shook it till the batterys fell out (Cat3k so the battery straps were plastic!)
For the next few weeks somebody kept putting a fire extinguisher beside my pit table as a joke