David Reynolds and Luke Youlden will likely have to wait until qualifying Friday afternoon after significant damage in practice two at the Bathurst 1000.
Youlden understeered at McPhillamy Park and crashed heavily into the concrete barrier causing extensive damage to the #9 Penrite Racing Commodore.
There was extensive suspension and structural damage that will take around 24 hours to repair, meaning that the car will not feature in the two practice sessions on Friday.
"There was lots of understeer going into the grate and just didn't make it out obviously and just didn't want to turn for me," Youlden said.
"We were battling with it a lot, we made a change to try and combat it but I went in too deep and messed up."
Youlden is confident with the speed of the car, however is disheartened with the error.
"I'm very disappointed with myself. I regard myself as a pretty safe pair of hands," Youlden said.
"The pace is hot and we were trying to do our best to push the team forward. We believe that we have a pretty quick car and I was just expecting more grip to be honest."
Youlden wasn't the only car to come unglued in Thursday practice with Macauley Jones backing his Holden into The Cutting.
The Cooldrive Brad Jones Racing Commodore locked the brakes and lost the rear on the way towards The Cutting and made heavy contact with the rear of the car, damaging the boot and the roof.
Jones continued on until Reid Park where he stopped on the side of the track triggering a red flag.
It did cause dramatic panel damage but was nothing serious, and the car was back out on track in practice three.
Macauley Jones, who is starting his fifth Bathurst 1000 this weekend, will be driving with Dean Canto in what is his 21st Bathurst campaign, making him the fourth most experienced driver on the grid behind Craig Lowndes, Steven Richards and Garth Tander.
Despite the crash for Youlden, Penrite Racing look fast so far, with Anton de Pasquale and Will Brown finishing third, fifth and ninth in the three practice sessions respectively.
Other incidents across the day included Ash Walsh beaching the Freightliner entry in the sand at Murray's Corner and Jake Kosteki hitting the wall at McPhillamy Park in the dying seconds of practice two.
Kosteki was able to return to the pit lane for the Kosteki Brothers team to repair the car.
Practice three saw trouble for Courtney who went through the gravel trap at The Chase, and McLaughlin set the pace with a 2:03.7728, a new practice/qualifying record for Supercars around Mount Panorama.