"That's where it stands."
Whincup's biggest challenge to claiming another victory at Mount Panorama appears to be from the other TeamVodafone Commodore, piloted by Lowndes and six-time champion Mark Skaife.
The veteran duo finished ahead of Whincup and Andrew Thompson to win last month's Phillip Island 500, their third straight endurance race win after claiming both Phillip Island and Bathurst last year.
And another win for Lowndes on Sunday would only intensify the championship battle between the two team-mates, although Whincup seemed to be relishing the challenge from the No.888 car.
"They've done a great job, without doubt," Whincup said of the Lowndes and Skaife.
"They did a fantastic job last year and then again at Phillip Island.
"We don't want them to slow down at all. Us, along with the rest of the field, would like to step up and hopefully someone takes the challenge up to them."
Whincup also stood up for co-driver Andrew Thompson who received criticism from Holden Racing Team's Garth Tander on Wednesday over his ability to drive in wet conditions.
"Thommo's been driving the sister car to the one we're racing all year so he's done plenty of miles," he said.
"(He) did a fantastic job at Phillip Island. We can't see any reason why he won't do a fantastic job again this weekend."
- AAP