Hot Shotz (1989)
A group of kids with radio controlled cars (and a RC helicopter with a cam) helping to foil some criminal gang's plans involving counterfeiting money.
Cast included Craig Parker as Nicholas Paget, and the series was directed by Steve La Hood.
Sources at TVNZ have told interested folk that sadly there are a number of copyright restrictions on this series which prevent it from being released on DVD etc.
Thanks to Joe Turnbull and Martin for the information.
NZonscreen have a treet for the helicopter fans: