Luca Filippi was fastest in GP2's first post-season test at Barcelona on Tuesday.
The seven-time race-winner only took part in the morning session before handing his Coloni car over to Italian Formula 3 champion Riccardo Agostini.
Coloni, which will not participate in GP2 in 2013, dominated most of the day, with Daniel de Jong second fastest behind team-mate Filippi in the morning and then quickest of all in the afternoon.
It was not a flawless day for the squad, though, as Filippi caused a red flag by spinning and stalling at Turn 5 just after topping the times.
The morning top five was completed by three 2012 GP2 drivers trying out different teams, with Nigel Melker third for champion squad DAMS, long-time iSport man Marcus Ericsson fourth for Trident, and Stephane Richelmi having a run with Lotus in fifth.
Ericsson was second behind de Jong in the afternoon, with European Formula 3 and F3 Euro Series champion Daniel Juncadella next up for Rapax.
Juncadella was just ahead of Stefano Coletti, who has already signed a 2013 Rapax deal.
Caterham protege Alexander Rossi was fifth for the Formula 1 squad's GP2 arm.
In addition to Juncadella, other junior single-seater luminaries trying GP2 at the test included Auto GP champion Adrian Quaife-Hobbs with Rapax, plus GP3 champion Mitch Evans and title rival Daniel Abt, who stayed with their respective Arden and Lotus squads.
Morning session: Pos Driver Team Time Gap 1. Luca Filippi Coloni 1m29.775s 2. Daniel de Jong Coloni 1m30.115s + 0.340s 3. Nigel Melker DAMS 1m30.315s + 0.540s 4. Marcus Ericsson Trident 1m30.356s + 0.581s 5. Stephane Richelmi Lotus 1m30.368s + 0.593s 6. Rio Haryanto Carlin 1m30.479s + 0.704s 7. Adrian Quaife-Hobbs Addax 1m30.494s + 0.719s 8. Stefano Coletti Rapax 1m30.516s + 0.741s 9. Mitch Evans Arden 1m30.566s + 0.791s 10. Jake Rosenzweig Addax 1m30.625s + 0.850s 11. Simon Trummer Arden 1m30.692s + 0.917s 12. Andre Negrao Racing Engineering 1m30.710s + 0.935s 13. Felipe Nasr Carlin 1m30.710s + 0.935s 14. Alexander Rossi Caterham 1m30.805s + 1.030s 15. Daniel Abt Lotus 1m31.008s + 1.233s 16. Daniel Juncadella Rapax 1m31.183s + 1.408s 17. Pal Varhaug iSport 1m31.326s + 1.551s 18. Kevin Giovesi Lazarus 1m31.355s + 1.580s 19. Julian Leal Trident 1m31.618s + 1.843s 20. Rene Binder Lazarus 1m31.681s + 1.906s 21. Lucas Foresti Caterham 1m31.840s + 2.065s 22. Arthur Pic DAMS 1m31.842s + 2.067s 23. Facundo Regalia iSport 1m31.927s + 2.152s 24. Gianmarco Raimondo Racing Engineering 1m32.524s + 2.749s 25. Riccardo Agostini Coloni 1m32.524s + 2.749s 26. Kevin Ceccon Ocean 1m33.082s + 3.307s Afternoon session: Pos Driver Team Time Gap 1. Daniel de Jong Coloni 1m30.408s 2. Marcus Ericsson Trident 1m30.567s + 0.159s 3. Daniel Juncadella Rapax 1m30.740s + 0.332s 4. Stefano Coletti Rapax 1m30.747s + 0.339s 5. Alexander Rossi Caterham 1m30.865s + 0.457s 6. Stephane Richelmi Lotus 1m30.886s + 0.478s 7. Adrian Quaife-Hobbs Addax 1m30.941s + 0.533s 8. Mitch Evans Arden 1m30.973s + 0.565s 9. Jake Rosenzweig Addax 1m31.043s + 0.635s 10. Kevin Giovesi Lazarus 1m31.067s + 0.659s 11. Nigel Melker DAMS 1m31.101s + 0.693s 12. Simon Trummer Arden 1m31.243s + 0.835s 13. Lucas Foresti Caterham 1m31.371s + 0.963s 14. Andre Negrao Racing Engineering 1m31.382s + 0.974s 15. Pal Varhaug iSport 1m31.394s + 0.986s 16. Arthur Pic DAMS 1m31.407s + 0.999s 17. Riccardo Agostini Coloni 1m31.413s + 1.005s 18. Daniel Abt Lotus 1m31.477s + 1.069s 19. Gianmarco Raimondo Racing Engineering 1m31.579s + 1.171s 20. Julian Leal Trident 1m31.649s + 1.241s 21. Felipe Nasr Carlin 1m31.708s + 1.300s 22. Rene Binder Lazarus 1m31.771s + 1.363s 23. Facundo Regalia iSport 1m31.771s + 1.363s 24. Rio Haryanto Carlin 1m33.897s + 3.489s