V8 Supercar fans could be in for an exciting show – or none at all – on Sunday, with rain expected to lash Sydney Motorsport Park.

The Bureau of Meteorology says there’s a very high chance of rain across the day, including at race time, with up to 30mm forecast.

Teams and drivers have been talking all week about the possibility of a wet race, which many of them predict will be chaotic given the lack of grip on the Eastern Creek circuit.

That’s if it’s not heavy enough to call the race off.

Holden’s Kiwi driver Shane van Gisbergen is known to be a master in the wet, but Ford youngster Chaz Mostert is happy to “give it a crack” after scoring a win and podium on Saturday.

“It could be anyone’s,” Mostert said.

“It’s pretty easy to make a mistake around here in the wet.

“There’s not great grip out there on the slick tyre, so imagine what it’s going to be like on the wets.”

Six-time champion Jamie Whincup, who ended a 15-race drought with a win in Saturday’s second sprint, reckons the cars will be unpredictable.

“We don’t really have wet tyres – we’ve got an intermediate, a grooved slick,” he said.

“But hopefully it doesn’t bucket down too much and we can still run on the track.”

Qualifying begins at 11.45am (AEST), with the 52-lap race starting at 2pm.