Williams Barcelona test, day 4 report

Pastor Maldonado: We did 121 laps so it's been a great day.

Driver Pastor Maldonado Chassis / engine FW33-01 / CA321 Location Circuit de Catalunya, Barcelona 4.655km Objectives Mapping and race simulation Weather Dry and sunny Ambient & track temps 16oC / 21oC

Sam Michael, Technical Director: It has been another productive day but it certainly didn't start out like that! We had a problem with the KERS cooling system just before the session opened, so we had to disable KERS for the day. Pastor then spent the morning doing some mapping runs for Cosworth and running some new exhaust components for aero to check temperatures for the last test aero upgrade that is coming - all of that worked okay. In the afternoon we completed a race simulation with no problems. Overall it has been a productive test although we still have some reliability issues to work on. The final winter test will now be held back at the Circuit de Catalunya, Barcelona from 8 - 11 March and we will be bringing our first race upgrade package.

Pastor Maldonado: We did 121 laps so it's been a great day. We tried lots of things on the car this morning and this afternoon we did a race simulation. The car felt great. We need to work to understand a little bit more about the balance on the longer runs but I am happy as the car is getting better each time we go out.

The AT&T Williams will unveil its 2011 racing livery at an event to be streamed live online via its website: www.attwilliams.com on Thursday 24 February at 1100 (GMT)