Defending V8 Supercars champion Jamie Whincup questions the pace of his Red Bull Racing Holden Commodore package after salvaging a hard fought fourth place at the Clipsal 500.

Whincup has dubbed the performance of the Triple Eight Engineering run Commodore as the slowest package he and his team has conjured around the streets of Adelaide for quite some time despite enjoying an electric start to the weekend.

The six-time champion was unable to capitalise on his race winning start to the event when a high-speed tyre blow out abruptly ended his race two challenge before a lack of car performance on Sunday meant Whincup had no answer to Holden's overall Clipsal 500 winner James Courtney.

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"Unfortunately it's the first time in a long time we haven't been on the podium on Sunday at the Clipsal 500," said the six-time champion.

"I don't mean to be negative, but that was the slowest car we've had around here for a long time. We just didn't find the pace so it was a matter of survival for us. We just aimed to stay out of trouble and keep as far up the pointy end as possible. A few cars faded late, which was nice as we were able to get a few back."

Even through the final corners, though, Whincup's weekend endured one further sting when a collision involving himself and the Pepsi Max Ford of Chaz Mostert created a vicious two-car shunt at race end.

As Mostert attacked Whincup for fourth, the pair touched with the resulting contact sending Mostert into a spin and directly into the path of the unwitting Nissan of James Moffat.

Whincup clarifies that there was more to the coming together than initially meets the eye.

"It was really unfortunate about the incident at the end with Mostert. I went through the staircase and I was slipping and sliding and realised Car 111 ahead had been dripping oil," Whincup continued.

"I was trying to get in front of him before turn eight, but then he pulled in on the racing line. I really backed it right off to make sure I didn't fire into the wall on the oil, Mostert went through there flat out and got a big run on me into the hairpin, so I covered. He got the cross back and a good run out, but unfortunately I can't make my car disappear.

"He was trying to go around the outside of me thinking that the road was clear, but it wasn't. Unfortunately we tapped, but I feel like I was a bit of an innocent bystander. I was just trying to do my thing and stay out of trouble, but that was that. We'll learn from today and come back stronger next time."