Elite Motorsport's Will Macintyre posted the quickest time on Friday at Silverstone, with the British driver's best time coming this morning before rain and stoppages resulted in barely any running in the afternoon.
The British driver, a winner here back in April, set a 1m53.631s, around three tenths of a second away from yesterday's outright best, and was just over a tenth of a second quicker than Rodin Motorsport's championship leader Alex Ninovic.
The lead duo had a decent margin over the rest of the pack, with Argenti with Prema's Reza Seewooruthun third and four tenths further back.
Hitech TGR's Deagen Fairclough was next up, just 0.015s away from fellow Brit Seewooruthun and 0.077s ahead of Abbi Pulling, the Rodin driver back in the top-five once more.
Lucas Fluxa put the second Argenti with Prema car in sixth, and was just five thousandths of a second ahead of Hillspeed's Michael Shin. Rodin's Gianmarco Pradel was only seven thousandths further back in eighth, and 0.024s ahead of Xcel Motorsport's Patrick Heuzenroeder.
The Australian's teammate Jack Sherwood completed a top-10 covered by 0.880s.
Heavy rain during session two resulted in only 11 drivers being able to set lap times, with Hitech's Keanu Al Azhari topping the session with a 2m06.282s.
Two red flag periods however, caused by separate incidents for Heuzenroeder and VRD's Patricio Gonzalez meant the majority of the session was spent under red flag conditions.
GB3 action resumes with qualifying tomorrow at 09.55 and 10.15, before the first race at 14.45.
GB3 Championship, partnered by the BRDC, Friday combined test result:
1. Will Macintyre, Elite Motorsport, 1m53.631s
2. Alex Ninovic, Rodin Motorsport, +0.117s
3. Reza Seewooruthun, Argenti with Prema, +0.530s
4. Deagen Fairclough, Hitech TGR, +0.545s
5. Abbi Pulling, Rodin Motorsport, +0.622s
6. Lucas Fluxa, Argenti with Prema, +0.761s
7. Michael Shin, Hillspeed, +0.766s
8. Gianmarco Pradel, Rodin Motorsport, +0.773s
9. Patrick Heuzenroeder, Xcel Motorsport, +0.797s
10. Jack Sherwood, Xcel Motorsport, +0.880s
11. Yuanpu Cui, Hillspeed, +0.927s
12. Keanu Al Azhari, Hitech TGR, +0.996s
13. Yevan David, Xcel Motorsport, +1.178s
14. Hugo Schwarze, VRD Racing, +1.269s
15. Kai Daryanani, JHR Developments, +1.307s
16. Bianca Bustamante, Elite Motorsport, +1.349s
17. Noah Lisle, JHR Developments, +1.361s
18. Flynn Jackes, Elite Motorsport, +1.788s
19. James Higgins, Chris Dittmann Racing, +1.792s*
20. Enzo Tarnvanichkul, VRD Racing, +1.847s
21. Divy Nandan, JHR Developments, +1.879s
22. August Raber, Argenti with Prema, +2.038s
23. Rodrigo Gonzalez, Chris Dittmann Racing, +2.111s
24. Patricio Gonzalez, VRD Racing, +2.125s
25. Nicolas Stati, Chris Dittmann Racing, +2.521s
*Testing, not racing