Toro Rosso duo on top at Barcelona

Although Toro Rosso are not expected to have their definitive 2008 car until the start of the European season, the team clearly wanted to see how fast the single lap pace of their updated 2007 machine was as both their drivers outpaced Lewis Hamilton's McLaren.

Toro Rosso spent much of the day simulating the demands of a race weekend, and the drivers' quickest times came during their qualifying practice.

The day was not completely trouble free for the duo, however, with Bourdais stopping on track at 3:30 pm and Vettel 45 minutes later - bringing out the red flags both times.

Hamilton, who had been quickest overall on the first day of the test, ended the day four tenths behind Vettel's best, and had a similar margin of advantage over his teammate Heikki Kovalainen.

Robert Kubica continued to show BMW Sauber's progress with the fifth quickest time, although he suffered a mechanical problem at 10:00 am that left his car stranded on the track.

Renault duo Fernando Alonso and Nelson Piquet were sixth and seventh fastest, to end the day ahead of Mark Webber, Nick Heidfeld and David Coulthard.

Williams duo Nico Rosberg and Kazuki Nakajima were able to resume their testing after new parts arrived for the FW30 that helped overcome the wing mounting issue that had caused Nakajima to go off on Friday.

The day brought further frustration for Honda Racing, with Jenson Button still failing to show any significant improvement in the pace from the RA108 - and also losing time in the garage early on with suspected steering problems. He also brought out a red flag at 10:15 am when he stopped on track.

Pos  Driver      Team                     Time      Laps
 1.  Vettel      Toro Rosso-Ferrari  (B)  1:21.679   89
 2.  Bourdais    Toro Rosso-Ferrari  (B)  1:21.782   88
 3.  Hamilton    McLaren-Mercedes    (B)  1:22.135   80
 4.  Kovalainen  McLaren-Mercedes    (B)  1:22.511   70
 5.  Kubica      BMW-Sauber          (B)  1:22.833   90
 6.  Alonso      Renault             (B)  1:22.938  115
 7.  Piquet      Renault             (B)  1:23.002  115
 8.  Webber      Red Bull-Renault    (B)  1:23.020   75
 9.  Heidfeld    BMW-Sauber          (B)  1:23.070   94
10.  Coulthard   Red Bull-Renault    (B)  1:23.322   85
11.  Rosberg     Williams-Toyota     (B)  1:23.347   34
12.  Nakajima    Williams-Toyota     (B)  1:23.948   40
13.  Button      Honda               (B)  1:23.959   58
14.  Liuzzi      Force India-Ferrari (B)  1:24.263   61

All timing unofficial