TeamVodafone's Jamie Whincup has one hand on the title after claiming the penultimate round of the V8 Supercar Championship Series in Tasmania on Sunday.

Whincup will face a nervous final weekend at the NRMA Grand Finale at Oran Park in two weeks if he is to secure his first Championship title.

He extended his Championship lead to a commanding 233 points in dominating the Falken Tasmania Challenge at Symmons Plains near Launceston today in front of more than 28,000 fans.

It was his fourth straight meeting win, a feat achieved by only six other drivers in the Championship history, and his sixth round win of the season.

He won both races today after finishing second on Saturday to finish clear of Todd Kelly with his TeamVodafone team-mate Craig Lowndes third.

"If this Championship happens it's going to be a great team effort. We will go to Oran Park needing about 70 points so we have to go and get the job done. It's not over until it's over," Whincup said.

"The car was great, in fact both cars were great and we proved it all weekend. I can't stress enough that this weekend was so, so important for us and I am so happy to have come out on top.

"I can't see why I can't go on to Oran Park and get the 67 points I need. It's a place I really like. I am not going to relax. I want to round the year off as well as I can."

It will come down to a two-horse race at Oran Park with Mark Winterbottom the only driver with a chance of catching his fellow Ford opponent.

Defending Champion Garth Tander dropped out of the title race after he could only manage eighth overall in a disappointing weekend for the Holden Racing team driver.

"We were hanging on by our fingernails coming into the round, but the Championship's definitely over now," Tander said. "Good luck to Jamie [Whincup]. We'll just go to Oran Park and enjoy the round for what it is, try to put on a really good show and end the year on a positive note."

There was some good news for Holden fans with the emergence of Kelly who followed his win in the wet on the first day with two third placings in the dry to finish runner-up for the round, the best this season for the Jack Daniels team.

"The speed was quite good in the dry today which was great," Kelly said. "After the amount of work the boys have done all year and the only thing the guys wanted was a result. To get another Holden up there and to do the job for Jack Daniels, it means a lot.

"All that hard work has paid off and just in the nick of time. I was feeling a bit of pressure to perform after having good speed but not getting a result in Bahrain. I'd like to think we can go on and perform strongly at Oran Park."

Winterbottom managed fourth overall this weekend ahead of Will Davison, Steven Johnson, Lee Holdsworth, Tander, Fabian Coulthard and Rick Kelly.

Whincup leads the championship on 3208 ahead of Winterbottom on 2975, Tander on 2788, Lowndes on 2619 and Davison on 2375.

Predictably Team Vodafone lead the team Championship with a 489 point lead over Ford Performance Racing.

The final round - the NRMA Grand Finale - is at Oran Park in Sydney in two weeks. It will also be Mark Skaife's last appearance in the V8 Supercar Championship Series.