Porsches have dominated the opening day’s practice session of the first round of the Australian GT championship on the streets of Adelaide.

Canberra driver James Koundouris in his Porsche 997 GT3 outpaced defending champion David Wall and Victorian Max Twigg to lead a big field of 31 GT cars.

Tony Quinn in the controversial Mosler MT900 was the only car to challenge the Porsches which featured in five of the first six places.

High profile Lamborghini driver Peter Hackett had to play second fiddle in the battle of the Gallardo’s to local driver Andrew Taplin.

Former GT champion Mark Eddy debuted his new Audi R8 LMS in 11th spot just ahead of the battling Dodge Viper pair of Greg Crick and Ross Lilley.

South Australian driver Gary Dann led the challenge class in his Porsche while Victorian Mark O’Connor in his Lotus Exige S was the fastest of the production class.

Qualifying for the first round of the series will take place on the streets of Adelaide tomorrow (Friday)