Pastor Maldonado was quickest on the second morning of testing in Barcelona as Lotus continued its strong week.

After Charles Pic was second fastest on Tuesday, Maldonado set a time of 1:26.311 on soft tyres to lead Kimi Raikkonen's Ferrari by 0.9s. Wednesday was a much more productive day for Raikkonen, who managed to complete several more laps having been limited to just 20 by a number of stoppages on track yesterday.

There was much interest around Mercedes at the start of the day as Nico Rosberg ran with a 'megaphone' exhaust fitted to his car as part of a test designed to improve the sound of the new engines. However, after some early runs with little audible difference, the exhaust was removed for the team's original specification.

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Following those tests, Rosberg carried out some constant speed runs before setting the third best time with a 1:27.411, 0.2s slower than Raikkonen. The Mercedes was almost 1.5s ahead of the next quickest car, with Esteban Gutierrez fourth for Sauber. However, there was an issue with around an hour to go in the morning session when Gutierrez returned to the pits and a small fire broke out at the rear of the car, which was quickly extinguished by his mechanics.

Sebastian Vettel endured a tough morning as Red Bull spent the majority of the session in the garage. Vettel emerged to complete 15 laps in the final hour and ended up 0.010s behind Daniil Kvyat who was fifth quickest for Toro Rosso but was the cause of two red flags during another disjointed session.

Susie Wolff - driving the FW36 for Williams for the first time - was eighth quickest on a 1:29.541 but also caused a red flag when she had a spin getting on the power out of Turn 10. The car was undamaged and Wolff was able to return to the track later to bring her total up to 27 laps.

Force India is testing tyres for Pirelli and Dani Juncadella was limited to 20 laps as he had a dramatic spin at Turn 4, losing the car on exit and spinning to the inside of the track. The car ended up in the gavel and, while any damage was unclear, Juncadella didn't return to the track. Stoffel Vandoorne made his F1 debut on Wednesday as McLaren also tested tyres.

The teams reverted to the normal schedule of running from 0900-1300 and 1400-1800 local time after Tuesday's rain-affected day, with much warmer and sunnier weather on Wednesday.