The Red Bull Holden Racing Team ace was 433 points behind championship leader Scott McLaughlin after a 14th-place finish in Saturday's first 300km race on the streets of Surfers Paradise.

On Sunday, Whincup didn't even get behind the wheel of his Commodore after co-driver Paul Dumbrell's collision with a wall as a storm hit the circuit ended their day after 31 laps.

The seven-time driver's champion quickly conceded the result meant any slim hope he had of retaining the title was over.

Whincup said his focus would now shift to helping teammate Shane Van Gisbergen in his title battle with McLaughlin.

"It's all over for us this year," Whincup told Fox Sports.

"Car 97 (Van Gisbergen) is still well in the charge and we'll do all we can to help them get it done."

A disconsolate Dumbrell, who won Bathurst alongside Whincup in 2012, could only curse his luck after the race was suspended shortly after his accident.

"There's 25 other guys and girls that didn't hit the fence and I did," Dumbrell said.

"I misjudged it and got it all wrong."

The 36-year-old hinted his time as Whincup's co-driver could now be over with speculation rife Craig Lowndes will take over in the role next year when the veteran quits full-time racing.

"It has been good and I'll reflect on it one day and say I've enjoyed the times ... but we've all got to retire one day, don't we?," Dumbrell said.

If the race is Dumbrell's last he ends his career with seven wins from 299 Supercars race starts including the 2012 Bathurst title and a trio of Sandown 500 titles in 2013, '14 and '18.

Australian Associated Press