Sergey Sirotkin led the first day of 2016 GP2 Series testing at Barcelona for ART Grand Prix before rain intervened.
The morning session at the Spanish track, venue for the season-opener in mid-May, was the day's only dry running.
Baku and Sepang on 2016 GP2 calendar
Recent ART signing Sirotkin, a race-winner with Rapax in his rookie season in 2015, set the pace with a 1m29.072s.
That put him seven hundredths ahead of last year's DAMS team-mates Pierre Gasly and Alex Lynn.
Red Bull protege Gasly has now moved to Formula 3 graduate team Prema, while Williams Formula 1 team development driver Lynn stays on at DAMS.
Experienced GP2 drivers filled the top seven places, but last year's European F3 runner-up Antonio Giovinazzi was the top newcomer in eighth for Prema, just ahead of erstwhile Carlin F3 team-mate Sean Gelael.
Carlin is one of three teams yet to announce its 2016 GP2 line-up, but fielded former GP3 frontrunner Marvin Kirchhofer and its 2012 F3 and GP3 driver Will Buller, back in Europe after racing in Japanese Super Formula last season. Buller will hand over to Rene Binder on Thursday.
Arden tried out GP3 race-winner Jimmy Eriksson and F3 graduate Nabil Jeffri, while Status did not participate in the opening day but will run Meindert van Buuren and Sergio Canamasas on day two.
Jeffri caused one of the morning's red flags with a crash at Turn 5, where Gustav Malja also went off during the wet afternoon running.
Oliver Rowland caused the day's other stoppage when his MP car came to a halt at Turn 2.
Raffaele Marciello was quickest in the rain in the afternoon, when times were nearly 14 seconds slower, ahead of Nicholas Latifi and Luca Ghiotto.
WEDNESDAY MORNING TIMES:
Pos Driver Team Time Gap Laps
1 Sergey SirotkinART Grand Prix 1m29.072s - 17
2 Pierre GaslyPrema Racing 1m29.141s 0.069s 20
3 Alex LynnDAMS 1m29.171s 0.099s 10
4 Norman NatoRacing Engineering 1m29.542s 0.470s 18
5 Mitch EvansJagonya Ayam Campos Racing 1m29.655s 0.583s 19
6 Jordan KingRacing Engineering 1m29.686s 0.614s 21
7 Arthur PicRapax 1m29.737s 0.665s 19
8 Antonio GiovinazziPrema Racing 1m29.771s 0.699s 19
9 Sean GelaelJagonya Ayam Campos Racing 1m29.784s 0.712s 28
10 Nobuharu MatsushitaART Grand Prix 1m29.934s 0.862s 16
11 Luca GhiottoTrident 1m29.967s 0.895s 20
12 Daniel de JongMP Motorsport 1m30.004s 0.932s 12
13 Nicholas LatifiDAMS 1m30.072s 1.000s 10
14 Artem MarkelovRUSSIAN TIME 1m30.139s 1.067s 20
15 Raffaele MarcielloRUSSIAN TIME 1m30.289s 1.217s 19
16 Marvin KirchhoferCarlin 1m30.317s 1.245s 26
17 Gustav MaljaRapax 1m30.396s 1.324s 23
18 William BullerCarlin 1m30.752s 1.680s 20
19 Oliver RowlandMP Motorsport 1m31.274s 2.202s 11
20 Philo Paz ArmandTrident 1m31.583s 2.511s 17
21 Jimmy ErikssonArden International 1m32.195s 3.123s 14
22 Nabil JeffriArden International 1m32.773s 3.701s 15
WEDNESDAY AFTERNOON TIMES:
Pos Driver Team Time Gap Laps
1 Raffaele MarcielloRUSSIAN TIME 1m41.863s - 23
2 Nicholas LatifiDAMS 1m43.500s 1.637s 19
3 Luca GhiottoTrident 1m43.758s 1.895s 20
4 Alex LynnDAMS 1m43.909s 2.046s 33
5 Gustav MaljaRapax 1m44.176s 2.313s 26
6 Jordan KingRacing Engineering 1m44.888s 3.025s 24
7 Sergey SirotkinART Grand Prix 1m44.905s 3.042s 14
8 Mitch EvansJagonya Ayam Campos Racing 1m45.274s 3.411s 21
9 Pierre GaslyPrema Racing 1m45.559s 3.696s 16
10 Oliver RowlandMP Motorsport 1m45.889s 4.026s 20
11 Marvin KirchhoferCarlin 1m45.986s 4.123s 21
12 Jimmy ErikssonArden International 1m46.043s 4.180s 25
13 William BullerCarlin 1m46.257s 4.394s 24
14 Antonio GiovinazziPrema Racing 1m46.455s 4.592s 17
15 Nobuharu MatsushitaART Grand Prix 1m46.675s 4.812s 27
16 Philo Paz ArmandTrident 1m47.345s 5.482s 31
17 Nabil JeffriArden International 1m47.692s 5.829s 23
18 Norman NatoRacing Engineering 1m48.174s 6.311s 21
19 Sean GelaelJagonya Ayam Campos Racing 1m48.513s 6.650s 24
20 Artem MarkelovRUSSIAN TIME 1m48.686s 6.823s 26
21 Arthur PicRapax 1m49.035s 7.172s 25
22 Daniel de JongMP Motorsport 1m50.630s 8.767s 21
23 Sergio CanamasasStatus Grand Prix - - 1
(autosport.com/ARL)
