Cameron Waters drove Chaz Mostert’s Ford to the fastest time in the first of two co-driver practice sessions for the Sandown 500.

Waters traded the top spot with team-mate Steve Owen and the Volvo of Chris Pither in the closing stages of the 30 minute session.

The Dunlop Series leader ended up as the only driver in the 1:09s, stopping the clocks with a 1:09.91s best.

“Chaz rolled out this morning and the car was pretty good so we’re just building on that,” said Waters.

“To go quickest in the co-driver session is awesome but Sunday is the day that you’ve got to be at your best.”

Pither ended up second in David Wall’s Volvo ahead of Owen, Paul Dumbrell, Jonathon Webb, Dean Canto, Karl Reindler, Warren Luff, Tony D’Alberto and Marcos Ambrose.

Kiwi Pither’s session included a wild moment at Turn 3, where a tap from Dean Fiore’s Nissan required quick reactions to keep the Volvo off the outside fence.

Luke Youlden endured two major offs at Turn 1 after left-front lock-ups on his way to 18th.

The Holden Racing Team’s Russell Ingall spent a fleeting moment at the top of the order before ending up 21st.

Result: V8 Supercars Wilson Security Sandown 500 Practice 2 (Co-drivers)