MOTORSPORT: A mechanical problem has all but ended Kel Treseder's chances of winning the Aussie Racing Cars championship.

Competing in the latest round of the championship at the Sydney Motorsport Park, a driveline problem in the final race ended what was shaping up to be a good weekend.

Learning a new track again in the series, Treseder shone once again to qualify second for the races before impressing with two second-place finishes in the opening two heats on Saturday.

After sealing third in the third race, Treseder's weekend then came undone as he couldn't get off the line in the final race.

Falling to 35th by the first corner, he bounced back to 16th but it wasn't enough to keep his title hopes alive as championship leader James Duckworth won the round to set up a large lead over the 32-year-old.

Talking about the problem, he said they almost didn't race in the final event.

"I knew there was an issue on the warm-up lap," he said. "Unfortunately it was pretty dead slow and it cost us dearly."

Treseder said the goal was now to win the Rookie of the Year.

"The focus is now on the top three and the Rookie of the Year award," he said.

"If we tick those boxes it will still be a great year for us."

He said there were also positives from the weekend, despite the final race.

"I was chuffed to be starting where we needed to be for the final race," he said.

"We'll now get the car to Brisbane and prepare for the final two rounds in New Zealand."

Treseder's next race is at Hampton Downs from October 28 to 30.