Lotus' Pic tests concept tyre as Bianchi impresses for Ferrari in place of Raikkonen.
Unseemly nose solutions are attracting all of the obvious attention early in 2014.
The 16-year-old managed 148 laps at Adria International Raceway.
Testing continues Thursday through Saturday.
Not the start to the second test of the year that Red Bull were hoping for.
The Williams driver finished six thousandths of a second ahead of Red Bull Racing’s Daniel Ricciardo.
Mercedes and Mercedes power dominate times and mileage at the Bahrain International Circuit
Following the first laps on track of the E22, drivers Romain Grosjean and Pastor Maldonado look to the season ahead.
Lotus F1 Renault team ended up the stars in their new 2013 car. Both Romain Grosjean and Kimi Raikkonen topped the speed charts over the four days of testing in Jerez. Jenson Button was quick on day one and Felipe Massa held the top time yesterday.
Marussia's Max Chilton topped the charts in the opening day of testing in Spain.
Vodafone McLaren-Mercedes driver Jenson Button closed out day one of the first preseason test on the Jerez circuit with the fastest unofficial time.
Maldonado was fastest in Barcelona Wednesday, ahead of Rosberg, who spent part of the day testing the controversial 'megaphone' exhaust.
Williams F1 Team had a few issues with the car which we they will investigate and aim to solve for tomorrow and the following days.
First time that the Scuderia Ferrari works team has been on top of the timesheets on the Jerez de la Frontera circuit.
Romain Grosjean laid down the unofficial fastest time on the Jerez circuit in Spain. The second day saw Lewis Hamilton ended up crashing the Mercedes into the barriers.
Kevin Magnussen topped the timesheets for McLaren at the end of the first day of the F1 Young Driver Test at Silverstone. Several of the Formula One current and reserve drivers were on hand along with testing Pirelli tyres.
Testing continues at this circuit tomorrow, when Fernando Alonso will be on track for the final day of the test.
The Vodafone McLaren Mercedes team appeared to have a perfect day on the Catalunyan circuit. Sergio Perez was on top of the unofficial times in the second round of the preseason testing of the new racing machines.
This week’s run data will feed into next week’s test, also in Bahrain.
Mercedes paced the first and second days of April testing in Bahrain, with Lewis Hamilton getting to spend some time in the No. 1 spot on day two.
Brazilian driver was sixth on the time sheet.
Ferrari's Fernando Alonso laid down the unofficial fastest lap on his third day in the 2013 car after missing the preseason testing in Jerez.
"In all honesty it wasn't a great day today," said Daniel Ricciardo.