Nico Rosberg was frustrated after practice on Friday ahead of this Sunday's F1 2010 Belgian Grand Prix at Spa-Francorchamps and he conceded it had been a 'tricky start' to the weekend.
The Mercedes driver was 13th in FP1 this morning, and while he improved in the relatively drier afternoon session, he remained in the same position, his best lap a 1 minute 50.382 seconds, more than a second off the pace.
"It's been a difficult day for us as we have been trying to get our revised parts for the car to work. The weather conditions have complicated our programme and whilst we've tried a lot of different things, it's been tough to get any consistent feedback," Rosberg said.
"I've suffered with understeer all day and really struggled with the balance on the wet tyres. The inters were better and it's difficult to say for the slicks really. I was quite far off with my car balance with the dry tyres so that didn't help. So a tricky start to the weekend for us and we need to sit down overnight and try to solve the problems."
Team-mate Michael Schumacher also wasn't too pleased and while he was slightly quicker in both sessions – tenth in FP1 and 12th in FP2, he is all too aware that his ten-place grid penalty will make Sunday trying to say the least.
Schumacher is now hoping conditions will remain mixed - and Mercedes team principal, Ross Brawn also believes a bit of rain could be beneficial.
"It's obviously a beautiful feeling to be back on this track which is still great to drive. It's also beautiful because I have a lot of good memories linked to Spa," Schumacher stated.
"But this doesn't help a great deal with the situation that we are facing here and having a ten place penalty makes it difficult to go into the weekend with big hopes for a good result. The weather might help a little by mixing up the field and so I hope it does not change too much over the race weekend."
"It was a very challenging day," Brawn added, "but then these types of changeable conditions may provide the opportunities that we can take advantage of this weekend."