HERE is some video with fresh batteries. please excuse the wild driving. this was the first time with my mini-z on a track without rails so there is added responsibility to keep the car on the track.
again, this common RCP tire setup did very well for the stock mini-z. i would advise that no more than 2 be on the track at the same time unless your racing with experienced drivers where 3 would be ok. passing skills and traffic avoidance skills are crucial here.