Eric Boullier says McLaren's recent spate of first-lap accidents have prevented the team from making the necessary progress with its upgrades.
McLaren-Honda has struggled with performance and reliability since reforming its partnership ahead of the current season. Progress has been slow, with the team's efforts not helped by first-lap accidents at the last two races - Fernando Alonso was collected by Kimi Raikkonen in Austria, while Jenson Button's British Grand Prix lasted just two corners
"We head to Hungary keen to shake off the poor luck we've encountered in recent races," Boullier said. "It's been a source of great frustration to see new components and upgrades destroyed before they've had the chance to be race-proven, through a series of first-lap accidents. However, the unshakeable belief and optimism of Fernando and Jenson has set the example for the whole team: they are remarkable assets, and their commitment during these times is incredibly valuable."
Honda hopes to have full use of its energy recovery system (ERS) - specifically the MGU-K - at the Hungarian Grand Prix. Boullier hopes this will allow McLaren to "scratch the surface" of performance in Budapest this weekend.
"Honda, too, has shown a commitment that remains admirably undiminished. Together, we are showing the fighting spirit and resilience that will see us continue to improve our performance and reliability as we move back to the front.
"I hope that our performance in Hungary will scratch the surface on the performance and potential that lies within our organisation - it would be great to go into the break feeling re-energised about the races ahead."