McLaren Racing Director Eric Boullier sees no reason why the team can't be optimistic about their chances at Spa after putting in the hard yards.
After starting the 2014 season with a double podium in Australia, the Woking squad have slipped to sixth in the Constructors' Championship, behind the likes of Williams and Force India.
Although the team picked up only one point in the final race before the annual mid-season break, Boullier believes they have ironed out some problems and will soon start to see the rewards.
"We had a disappointing race in Hungary to send us into the summer break, but we've analysed the issues we encountered, and we believe we now understand what went wrong. More important, we all head to Belgium feeling positive and refreshed, and incredibly keen to get back to work.
"The first half of the season has shown signs of both promise and disappointment, but, through it all, Jenson and Kevin have each driven some particularly inspired races, made very few mistakes and always extracted the maximum from the package. Equally, the team has worked hard at both the factory and the racetrack to improve performance - and we're now starting to see those returns.
"Spa and Monza are tracks where every team runs a unique downforce package, so it won't be until Singapore - where we resume with a more conventional set-up - that we'll get a clearer read on our progress, but I think we have reasons to be optimistic. The operational changes we've implemented over the course of the season have taken time to bed-in, but I think we'll certainly see a more pronounced upswing in performance over these final eight races of the year."