David Wall and John Bowe have ended morning warm-up fastest ahead of today's Hi-Tec Oils Bathurst 6 Hour at Mount Panorama.
The final 20-minute hit out saw the Wall/Bowe Mitsubishi EVO IX top the time sheets with a 2:26.945s from Leigh Burges and Jack Perkins, who are sharing last year's race winning BMW 335i, on a 2:28.601s.
After a tough qualifying session which saw Chaz Mostert set a time without any boost in the turbo charged Ford Focus RS, the former Bathurst 1000 winner set the third best time with co-driver Nathan Morcom at 2:28.662s.
Having set the third fastest time in qualifying, the Karl Reindler and Andrew Richmond Mitsubishi EVO X ended warm-up sixth fastest.
However, they will start today's race from the rear of the grid after failing post-qualifying scrutineering.
The car was found below the minimum ride height, caused by a decision to run 265/35 tyres instead of the 245/40 tyres the car ran in 2016.
Three other cars also failing post-qualifying scrutineering, including the the Declan Kirkham/Phillip Kirkham/Aaron Cameron Mazda MX6, the Daniel Williams/Kirt Metcalf/Daniel Sugden Toyota Camry and Mark Griffith/Jacob Andrews Mitsubishi EVO IX.
Favourites for the race remain the Sherrin brothers, who yesterday set the fastest ever lap for a production car around Mount Panorama, ending warm-up seventh fastest at 2:32.079s in their BMW M4, while Garth Walden and Craig Baird ended the session fourth quickest in the Mercedes AMG A45.
Race start is 1130 AEST.