Jenson Button declared himself 'pretty happy' after setting the pace on the first day of running in Istanbul ahead of the Turkish Grand Prix.
After the team elected to sit out much of the opening session of the weekend due to the wet conditions, Button proved to be the quickest man in the dry second session, posting a best time of 1min 26.456secs.
That allowed the Briton to edge Nico Rosberg out of top spot and Button insisted he was pleased to lead the way, even though he was concerned by the handing of his MP4-26 through the bumps at turn twelve.
“I'm pretty happy with how today went,” he said. “The car's been working reasonably well – there are always things you want to improve, but we've made some good progress and have a lot of useful data to go through.
“Trying to get the car to ride the bumps well into turn twelve has been difficult, but we improved it through the session. Turn twelve is really bumpy – it's like they put a motocross jump in there! Turn eight's quite tough too because, depending on your balance, it can damage the front and rear tyres. It's about getting the balance right, which we concentrated on today.
“We haven't put everything on the car that we wanted to this weekend, which is disappointing, but we still have some useful upgrades so it's nice to keep moving forwards.”
McLaren eam-mate Lewis Hamilton failed to set a time in the first session after electing to save his wet and intermediate tyres but then posted the third quickest time in the second session, admitting that the long runs he had during the session were more than productive.
“We saved tyres during this morning's session,” he said. “In the afternoon, despite the limited running in P1, we got quite a lot of our run-plan completed, which was very satisfying.
“I initially struggled a little bit with set-up, which we can look at and fix overnight, but I was really pleased with my long-run pace – I think it was probably one of the best practice long-runs I've ever had.
“Generally, our car has a pretty good baseline. We're still in the fight: the most important factor this weekend is to continue with our consistency – getting on the podium is my target, and if we can win that'll be even better!”