circuit closed in 2010, the outright lap record stood at 1:01.6718 by Tim Leahey in a Reynard 92D-Holden (3.8L) Formula Holden set in July 2000. Note that in mid-1984 the circuit was changed slightly with the addition of a straight run after turn 3 heading to what was turn 5 and eliminating what was turn 4. This made turn 3, and subsequently the new turn 4, slightly faster and gave the Grand Prix Circuit 12 corners instead of 13. The result was an overall improvement in lap times of approximately 0.5 to 1 second per lap. Motorbikes continued to use the pre-1984 sequence of turns until one year before the circuits closure. The official race lap records at Oran Park Raceway are listed as: Gallery References External links Oran Park Track Days Oran Park Hot Laps Oran Park LIDAR Former Supercars Championship circuits Superbike World Championship circuits Sports venues in Sydney Defunct motorsport venues in Australia Australian Grand Prix Oran Park, New South Wales Narellan, New South Wales