Guernsey's Andy Priaulx is baffled by his poor form after finishing 19th in the third round of this year's DTM series at Austria's Red Bull Ring.
The three-time World Touring Cars champion only qualified in 22nd position for the race and has yet to score a point this season.
"I wish I could explain why the car is not fast enough.
"Along with BMW Team RMG, I have looked at everything, but performance-wise we seem to be going backwards," he said.
"I know I have the speed to be up there at the front, and am determined to find out why we are not quick enough."
Fellow BMW driver Bruno Spengler, who leads the series, won Sunday's race ahead of Marco Wittmann and Timo Glock.