Jenzer Motorsport's Ralph Boschung posted the fastest time of anyone in the two days of GP3 pre-season testing this week at the 2.6-mile, 13-turn Estoril circuit in Portugal.

Boschung took advantage of better conditions on Thursday morning to go significantly faster than anyone had managed on Wednesday, his best lap of 1:27.789s comparing with the benchmark time set the previous day by Antonio Fuoco of 1:28.410s.

See full times from day 1 of GP3 testing at Estoril

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In fact the top seven drivers on Thursday were all able to set better times that Fuoco's previous best, with birthday boy Marvin Kirchh?fer just under two tenths off Boschung's pace in second, followed by Arden's Emil Bernstorff, Koiranen GP's Jimmy Eriksson, Fuoco himself and then Carlin's Mitchell Gilbert and Trident's Luca Ghiotto before the chequered flag came out to indicate the lunch break at midday.

Compared to the damp track conditions that greeted the 23 drivers on Wednesday, the dry and breezy weather on Thursday morning had been a significant upgrade for all concerned. Everyone made the most of the improvement, with ART's Alfonso Celis Jr setting the initial pace before he was usurped from the top of the timing screens by Gilbert.

Kirchh?fer was the first to lap under 1:28 albeit only by just over three hundredths of a second, but Boschung eventually managed to pip that effort by a tenth and Kirchh?fer was unable to respond with a better effort before the lunch hour.

The day warmed up and the sun came out for the afternoon session, which meant that most drivers were opting on longer runs rather than trying to improve upon their morning flying lap times. The Carlin trio of Gilbert, Jann Mardenborough and Fuoco took an early hold of times, until their grip was disrupted by Koiranen GP's Matthew Parry making an appearance in the top three.

Status Grand Prix's Alex Fontana shot to second quickest at the midway point, but he was still six tenths off Gilbert's time of 1:28.517s which left plenty of room for other drivers to slot into as the clock counted down which Ghiotto was quick to do, albeit still two tenths shy of the leader.

Jenzer put in a group effort to charge to the top, with Matheo Tuscher finishing in second place, Pal Varhaug in fifth and Boschung achieving a creditable follow-up to his morning performance by clinching sixth by the time the end of the test was signalled. With Bernstorff also managing to improve to third, that left Ghiotto having to settle for fourth place.

There was only one red flag during the day, with Kevin Ceccon stopping in turn 1 in his Arden late in the morning run. The young Italian was able to return to action in the afternoon and finished with the seventh fastest time of the post-lunch session.

The teams and drivers have three more two-day pre-season test sessions scheduled in Spain next month, at Valencia on April 9-10 and the Circuit de Catalunya in Barcelona on April 22-23.

The first race of the 2015 season will be held in Barcelona on May 8-10 in support of the F1 Spanish Grand Prix the same weekend.

See full times from day 1 of GP3 testing at Estoril