Mark would continue to work with his new team, putting more mile sin driving the FW26. He worked on chassis setup as well as tyre testing for Michelin with their 2005 tyres. He would complete 101 laps, with a best lap time of 1m:15.172.

For team-mate Antonio Pizzonia his day would see him hampered by gearbox problems which would limit his track time to just thirty six laps. He would set a best lap time of 1m:15.513. He would test interim components for the 2005 car.

WilliamsF1 Test Team Manager Tim Newton commented on the days testing by saying: "We’ve had another productive day today at Barcelona. Mark continued on his learning curve in the FW26, working on chassis set-up and tyre testing with Michelin. By the end of the day, he had completed an impressive 101 laps and set the second quickest time of the session behind Zonta. Antonio continued brake work and systems checks on the interim car but was hindered by gearbox problems. Mark will complete the team’s programme tomorrow with a wet test for Michelin.“

Team tyre supplier Michelin will test their wet weather tyres on Saturday by using water tankers to soak the track with water to simulate rain.

POS. DRIVER TEAM TIME LAPS

1. R. Zonta Panasonic Toyota Racing 1:14.987 22/146
2. M. Webber BMW WilliamsF1 Team 1:15.172 13/101
3. J. Villeneuve Sauber Petronas 1:15.185 80/95
4. P. de la Rosa West McLaren Mercedes 1:15.428 15/89
5. J.P. Montoya West McLaren Mercedes 1:15.510 13/52
6. A. Pizzonia BMW WilliamsF1 Team 1:15.513 8/36
7. C. Klien Red Bull Racing 1:15.535 32/56
8. V. Liuzzi Red Bull Racing 1:15.650 37/84
9. M. Gené Scuderia Ferrari Marlboro 1:15.812 54/111
10. F. Montagny Mild Seven Renault F1 Team 1:16.435 31/110
11. G. Fisichella Mild Seven Renault F1 Team 1:16.577 19/92
12. J. Button Lucky Strike BAR Honda 1:16.735 10/83
13. T. Sato Lucky Strike BAR Honda 1:16.751 38/54
14. E. Bernoldi Lucky Strike BAR Honda 1:20.058 3/44