Defending V8 Supercars champion Jamie Whincup believes his Red Bull Racing Australia squad are in good shape for this weekend's Clipsal 500 despite their lack of pace at the Sydney SuperTest.

Whincup begins the defence of his record breaking sixth championship success this weekend at Adelaide but questions over the ultimate pace of his Triple Eight Engineering run Holden Commodore remain unanswered following an indifferent showing at the Sydney SuperTest.

The 32-year old was almost a second slower than Ford's pacesetter Chaz Mostert to end the one-lap shootout in twelfth while his team mate Craig Lowndes - who also struggled - finished a tenth up the road in eighth.

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Nevertheless, Whincup remains upbeat as the Red Bull driver heads to an event in which he has won on four previous occasions.

Whincup missed the opportunity to make it five victories around the streets of Adelaide last season when a race three drive through penalty - received for a dubious pit lane infringement - forced the champion to relinquish his lead.

"Clipsal is one of the biggest events on the calendar and a great way to kick off another big Championship," said Whincup.

"It got away from us last year after a controversial drive through penalty in Sunday's race, but I'll never forget that battle on Saturday.

"We have done a fair bit of work after our poor showing at the SuperTest to make sure we are giving ourselves a great opportunity this weekend. We come into the event on a level playing field, but you can never discount anyone."