I just had a second look at the event schedule and noticed that there are no races for group Q and R sports cars. Only Q and R racing cars including 4 F5000 cars.
A couple of years ago it was the event for big engined sports and racing cars, but now it seems thats not the case.
The Tasman Revival at Eastern Creek has a good entry of sports cars, and Phillip Island in March 2011 is featuring sports cars, so we can still get our fix.