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Teacher Rebecca Lund said teams of year 9 hard materials technology pupils had spent the term making go-karts from old wheelie bins.
Yesterday was a chance for 22 of them to compete in a time trial lap of the race track at Game Over Queenstown entertainment centre in Frankton.
As well as their lap times, the teams were judged on their go-kart's decoration, standard of workmanship and teamwork.
Firey Racers team member Julia Lima said she and her team-mates had enjoyed the 10-week project because it involved "hands-on crafting".
It also required research, careful measurements and an opportunity to use a variety of tools for the first time, she said.