Audi and Lamborghini teams set the pace as Mt Panorama lap times dipped into the 2m 04s bracket yesterday, ahead of Sunday's Liqui-Moly Bathurst 12-Hour endurance race.
Four 60-minute free practice sessions were completed with Australian David Russell in the Lago Racing Lamborghini Gallardo clocking Friday's fastest lap of 2m 04.23s during the third session.
German team Phoenix Racing with its Audi R8 LMS crewed by Marco Mapelli (Italy), Laurens Vanthoor (Belgium) and Markus Winkelhock (Germany) also dipped under 2m 05secs when it topped the second session with a 2m 04.98s effort.
The final afternoon session was headed by the Melbourne Performance Centre Audi R8 LMS of Australians Marco Cini and Mark Eddy and German team-mate Christopher Mies.
There's a fifth 60-minute session at 9.45am (NZT) Saturday before a 60-minute qualifying session starting at 2.55pm. The top 10 cars transfer into a 20-minute shoot-out to determine the first five rows of the grid for Sunday's enduro.