As a comparison, the VK Commodores run by the HDT at the 1984 James Hardie 1000 under the old Group C regulations (which saw the cars have much larger wheels and large aerodynamic spoilers front and back) produced over and were recorded at on the long Conrod Straight. The near standard 1985 Group A race cars only produced around and were recorded at on Conrod. This difference was also reflected in lap times with Peter Brock's fastest 1985 qualifying time being 8.811 seconds slower than he was in 1984.