Lotus driver Pastor Maldonado set the fastest time during the second day of the Formula One testing session at Barcelona's Circuit de Catalunya on Wednesday.
The Venezualan driver posted a time of 1:25.075 with an hour to go in the session, before diving under the 1:25 mark with a blistering lap of 1:24.871 on the super soft Pirelli's in the final stages of the day's proceedings.
After struggling with various reliability issues during the Bahrain test last month, Lotus had a far more productive time of it in Spain.
Test driver Charles Pic finished 69 laps on Tuesday and was bumped off the top of the time sheets by Max Chilton, before Maldonado set the blistering pace on Wednesday.
While his fastest time was on the supersofts, it was nevertheless almost a second faster than Nico Rosberg, who completed 102 laps himself.
Earlier in the session, Rosberg tested the 'megaphone' exhaust to see whether it improves the noise level of the cars, but after it was decided that the prototype part makes little audible difference, the Mercedes driver completed the rest of the test with the team's original specification.
Kimi Raikkonen had another go at the circuit after a troublesome time of it on Tuesday, and completed 90 laps and set the third fastest time, albeit six tenths slower than Rosberg's best.
Nevertheless, he was half a second faster than the Sauber of Esteban Gutierrez, whose car caught fire in the pit lane during the early parts of the day.
Susie Wolff set the fifth fastest time in the Williams and looked competent behind the wheel of the FW36, although she caused the session to be red-flagged when she spun at Turn 10.
After topping the time sheets on the first day, Marussia couldn't replicate the time Max Chilton set, since his team-mate Jules Bianchi was confined to the garage for long parts of the day with technical problems.
Bianchi eventually posted a competitive time on the soft tyres late in the day, although he was eight tenths slower than Chilton's best.
McLaren spent the day testing tyres for Pirelli, which presented Stoffel Vandoorne with an opportunity to get behind the wheel of a F1 car for the first time.
He was limited to a best time of 1:28.441 in 136 laps, although Pirelli had set the run plan for the 22-year-old Belgian driver.
Caterham took no part in the day's proceedings after Kamui Kobayashi's crash late on Tuesday ruined the session for the team as well as Robin Frijns.
Day Two times:
1. Pastor Maldonado Venezuela Lotus-Renault 1m 24.871s
2. Nico Rosberg Germany Mercedes-Mercedes 1m 25.805s
3. Kimi Raikkonen Finland Ferrari-Ferrari 1m 26.480s
4. Esteban Gutierrez Mexico Sauber-Ferrari 1m 26.972s
5. Susie Wolff Britain Williams-Mercedes 1m 27.280s
6. Jules Bianchi France Marussia-Ferrari 1m 27.718s
7. Sebastian Vettel Germany Red Bull-Renault 1m 27.973s
8. Daniel Juncadella Spain Force India-Mercedes 1m 28.278s
9. Stoffel Vandoorne Belgium McLaren-Mercedes 1m 28.441s
10. Daniil Kvyat Russia Toro Rosso-Renault 1m 28.910s