Caltex Havoline Racing's Russell Ingall says he will "do what he has to do" in an effort to help his Stone Brothers Racing teammate Marcos Ambrose the 2003 V8 Supercar Championship Series at Eastern Creek this weekend.

Ingall sits fourth in the championship heading into this weekend's VIP Petfoods Main Event and cannot improve or damage his championship position.

Ambrose, who drives an SBR-prepared Pirtek Falcon, leads the championship by 24 points from Greg Murphy after the championship tally is adjusted to drop each driver's worst round of the season.

Stone Brothers Racing will be looking to cap-off the team's best season to date, which already includes the Konica V8 Supercar Series which was won by Mark Winterbottom back in August.

Ingall has a couple of round wins under his belt this year and finished third to Ambrose when the V8s ran at Eastern Creek earlier in the year.

Always tough and aggressive, Ingall has enjoyed his first season as a Ford driver in the V8 Ranks and is looking forward to playing a role in the Blue Oval Brigade winning its first national touring car title since 1997.

"The Enforcer" has nothing to loose this weekend -- and that's just the way he likes it.

"I don't think anyone wants to see the championship decided by a third party, especially Marcos and Murphy," said Ingall.

"While saying that, you will have to be a pretty brave man to try and pass me if I am in second place and Marcos is leading.

"I am going to Eastern Creek at the weekend to win the round and that will have a positive effect on Marcos' championship hopes because I will be taking points off other drivers.

"Everyone at SBR has worked so hard this season to win this title and I will "do what I have to do" to help us achieve that goal."