After building a GP car for Jean Behra, which became known as Behra-Porsche, Colotti built his own Grand Prix car named Tec-Mec F415, based on Maserati 250F in 1959, with Fritz d'Orey as the driver who finished 10th at 1959 French Grand Prix. At about the same time, Alf Francis, the Chief Engineer at Rob Walker Racing, started working with Colotti, changing the Tec-Mec name to Colotti-Francis.