Audi says it will 'leave no stone unturned' in its fightback against Porsche for the FIA World Endurance Championship after struggling to compete against its German manufacturer rival at the Six Hours of Nurburgring.

Chris Reinke, Head of LMP at Audi Sport, felt his squad's two Audi Sport Joest R18 e-tron LMP1s battled hard at its home event but struggled to match the pace of the dominant Porsche pair.

WEC championship leaders Andre Lotterer, Marcel Fassler and Benoit Treluyer acted as the nearest challenger to Porsche's second successive one-two result for the final podium spot while the #8 Audi driven by Lucas di Grassi, Oliver Jarvis and Loic Duval finished fourth.

Related Articles

Despite Reinke's disappointment at the underwhelming result he is now determined to find where Audi is losing out in order to close the gap in performance to Porsche ahead of the fifth round of the 2015 World Endurance Championship at the Circuit of the Americas.

"In Audi's home round, we competed in front of an impressive crowd of fans. It was great to see how popular the LMP sports cars are in Germany. That was perfect advertising for the FIA WEC," Reinke said. "For the remaining races, we're going to leave no stone unturned to continue to optimally support our drivers in the battle for the WEC title. The title is far from having been decided."

Head of Audi motorsport Dr. Wolfgang Ullrich admitted Porsche were worthy winners at the Nurburgring but was pleased to see Lotterer, Fassler and Treluyer maintain their advantage at the top of the WEC drivers' championship, leading the #17 Porsche by 17 points.

"We'd have liked to have battled for victory in our home race in front of a large crowd as we did at the beginning of the season," Ullrich said. "But we had to accept that Porsche were stronger today. In the standings, our drivers have maintained a remarkable advantage. This means we can expect a thrilling second half of the season."