Mario Theissen admits BMW are not happy with how this season is panning out, having scored just eight points in eight races.
After last year's highs, which included a victory in the Canadian GP, BMW entered this year's Championship with the aim of fighting for the World titles. The German squad, though, isn't even close to doing that.
The under-performing F1.09 has not only lacked pace over a single lap but has also come up short for race-pace, leaving Nick Heidfeld and Robert Kubica fighting near the back of the midfield.
But despite the disappointments that have dogged them this year, Theissen is confident his team will fight back in the latter half of the Championship.
"Going into the German Grand Prix, we cannot be happy with the season so far. After three successful years, this recent period has been the first set-back for our team - and is one we will overcome," Theissen said.
"After all, this is the same team in Munich and Hinwil that has delivered continuous improvements since the team was founded. We are all absolutely determined to start moving forwards again and I expect us to experience an upturn in form.
"It is certainly not easy to make up lost ground without the chance to do any testing, but that is what we're aiming to do."
The first step towards this is the upgrades BMW will be using next weekend in Germany, which include "a further developed version of our double-decker diffuser."
