Williams again on top at Valencia

After Mark Webber set the fastest time yesterday, it was Nico Rosberg's turn to finish on top of the times with the new Cosworth-powered FW28 car.

Despite feeling unwell due to food poisoning, Rosberg posted a best time of 1:10.994 as he completed a race simulation, also testing the new seamless gearbox Williams are developing.

Rosberg worked alongside Webber, who today was sixth quickest after just 33 laps focusing on tyre selection.

Finland's Kimi Raikkonen covered only 16 laps before his Mercedes engine let go, but that was enough for the McLaren driver to post the second quickest time in the MP4-21.

Teammate Juan Pablo Montoya had a more productive day, covering 85 laps as he concentrated on doing long runs in the second McLaren.

The Renault team kicked off their test today after skipping yesterday's session, with both Giancarlo Fisichella and Heikki Kovalainen doing the driving. Kovalainen was third fastest, while Fisichella, working on tyre testing and car set-up, finished in fourth.

Both men caused a red flag each.

Austrian Christian Klien was fifth quickest in the revised RB2 car from the Red Bull team. The car, fitted with a new aerodynamic package, showed promising pace again in the hands of Klien, who focused on aero work and tyre testing.

His teammate Robert Doornbos, driving the RB2 but with the old aerodynamic package, was 10th fastest. Scot David Coulthard was also in action for Red Bull, but he covered only 14 laps.

Christijan Albers replaced teammate Tiago Monteiro at the wheel of the new MF1 car, while one of the team's test drivers, Giorgio Mondini, worked with the EJ15B.

Albers, who went off track and touched the barriers in the afternoon, was eighth quickest after working on tyre testing and car set-up.

Today's times:

Pos  Driver        Team                      Time      Laps
 1.  Rosberg       Williams-Cosworth    (B)  1:10.994  94
 2.  Raikkonen     McLaren-Mercedes     (M)  1:11.199  16
 3.  Kovalainen    Renault              (M)  1:11.362 115
 4.  Fisichella    Renault              (M)  1:11.443  83
 5.  Klien         Red Bull-Ferrari     (M)  1:11.544  63
 6.  Webber        Williams-Cosworth    (B)  1:11.584  33
 7.  Montoya       McLaren-Mercedes     (M)  1:12.462  85
 8.  Albers        MF1-Toyota           (B)  1:12.916  64
 9.  Coulthard     Red Bull-Ferrari     (M)  1:13.585  14
10.  Doornbos      Red Bull-Ferrari     (M)  1:14.643  44
11.  Mondini       MF1-Toyota           (B)  1:14.646  84

All Timing Unofficial