Michigan is now one of the fastest tracks in NASCAR due to its wide , sweeping corners and long straightaways . It normal speeds of more than 190 mph , but corner entry speeds easily pass 200 mph ( ~ 320 Km\/h ) . Michigan is now one of the fastest tracks in NASCAR due to its wide , sweeping corners and long straightaways ; typical qualifying speeds are in excess of 190 m and corner entry speeds are anywhere from 205-215 mph ( 320 km\/h ) .