Carlos Ambrosio and Gilberto Farah led the first and second sessions respectively on the first day of running of the Brazilian Porsche Challenge series at Curitiba.

Both sessions were conducted in changing conditions on the 3.7km circuit by the eighteen drivers elected to take to the track in preparation for the racing to take place on Saturday August 20.

Ambrosio led the opening session with a time of 1:24.141, Farah heading the slightly quicker second session with a time half a second quicker. Eduardo Azevedo was second in both sessions while points leader Fernando Barci could only muster seventh fastest in the first session, improving to third on the second timesheet.

The field includes two drivers competing on their home track in the Brazilian state of Parana. Guilherme Ribas, whose father competes in the Cup category the higher profile series that shares the bill at Curitaba, was by far the fastest, with a six and seventh to boast from the day's on-track action.

Debutant Omar Carmargo Neto used the day to adapt to the cars on his first racing outing, as the 33-year-old makes the move to four-wheels following a successful show jumping career.