Kimi Raikkonen attributed a change in the wind direction as to the reason why in the afternoon practice session he was unable to get close to the pace that saw him destroy his opposition in the morning.

Raikkonen dominated the first practice session of the weekend, going fastest early on and spending the remainder of the 90-minutes chipping at that time, eventually finishing four tenths faster than Ferrari team-mate Felipe Massa and 1.2secs quicker than Fernando Alonso in third.

However, any hopes of repeating the lap, which would prove the only one of the day to dip below 1min 28secs, in the afternoon session were dashed by a change in wind direction, according to Raikkonen.

A lengthy red flag period didn't help either, but while Raikkonen was frustrated not to build on his earlier pace, he was nonetheless pleased with his day.

"I am reasonably happy with the way things went in the morning and a bit less so when it came to the afternoon. For some reason, probably a change in the wind direction, conditions were rather difficult and we will have to evaluate very carefully the data from the second session because it is easy to go down the wrong route.

"As for the two types of tyre, from what we have seen today, both work well but we will have to wait to do a more complete evaluation tomorrow. We have a good package which we must try and get the most out of."

Felipe Massa, who won the Turkish Grand Prix in 2006, was satisfied with his day's work too, but accepted there is more to come from his car as the weekend progresses.

"I am happy with the outcome of these three hours of free practice. Both this morning, when I was running without the latest aerodynamic updates and this afternoon, the car was well balanced. There is still some room for improvement, but that is just part of the normal evolution of a race weekend.

"Both types of tyre seem to be very quick and consistent in terms of performance. We will have to evaluate them carefully in terms of their performance for the race. In the afternoon, probably because of the wind, the track conditions changed and overall, there was less grip. I set my best time in the first minutes when I was still on worn tyres. I think we will be competitive."