The track began as a small 550 m ( 0.34 mi ) oval in 1969 .
This was then expanded to a full 1.800 km ( 1.118 mi ) , 11 turn race track .
The track began as a small 550 m ( 0.34 mi ) oval in 1969 , and this was then expanded to a full 1.800 km ( 1.118 mi ) , 11 turn race track .