Hillspeed's Dante Vinci currently leads the way after the first two test sessions of the day at Spa-Francorchamps.
The Australian contender lapped the Belgian Grand Prix circuit in 2m11.875s during this morning's first session, a time over 1.8 seconds quicker than last year's best pole lap, and over three seconds ahead of the official race lap record.
Vinci is currently just 0.020s quicker than VRD Racing's championship leader Nikita Bedrin, with Rodin Motorsport's Martin Molnar four tenths of a second behind the lead duo.
Hitech's Deagen Fairclough improved his session one time in the second session to top that session and move up to fourth overall on current times, 0.110s clear of the second Rodin Motorsport car piloted by Maxim Rehm.
Kyuho Lee is the top Elite Motorsport car with a session remaining, 0.087s in arrears of Fairclough and 0.117s ahead of Xcel's Rowan Campbell-Pilling.
Hitech's Yuhao Fu is next up in eighth, just seven thousandths of a second clear of Rodin's Abbi Pulling in ninth, while VRD's Patricio Gonzalez completes the top-10, which is currently covered by just over a second.
GB4 champion Ary Bansal is deputising for Xcel's Lucas Fluxa today, and is currently 11th on the Thursday timesheets.
One more session remains at Spa today, which is due to commence at 17.25 local time.
GB3 Championship, partnered by the BRDC, Spa-Francorchamps Thursday live testing results:
1. Dante Vinci, Hillspeed, 2m11.875s
2. Nikita Bedrin, VRD Racing, +0.020s
3. Martin Molnar, Rodin Motorsport, +0.461s
4. Deagen Fairclough, Hitech, +0.512s
5. Maxim Rehm, Rodin Motorsport, +0.622s
6. Kyuho Lee, Elite Motorsport, +0.709s
7. Rowan Campbell-Pilling, Xcel Motorsport, +0.826s
8. Yuhao Fu, Hitech, +0.957s
9. Abbi Pulling, Rodin Motorsport, +0.964s
10. Patricio Gonzalez, VRD Racing, +1.048s
11. Ary Bansal, Elite Motorsport, +1.071s
12. Kirill Kutskov, Elite Motorsport, 1.181s
13. Rodrigo Gonzalez, VRD Racing, +1.206s
14. Jack Taylor, Fortec Motorsport, +1.235s
15. Peter Bouzinelos, Hillspeed, +1.309s
16. Ricardo Baptista, Xcel Motorsport, +1.325s
17. Flynn Jackes, Elite Motorsport, +1.437s
18. Lewis Gilbert, Arden Motorsport, +1.858s
19. Leon Wilson, Arden Motorsport, +1.974s
20. Aurelia Nobels, Hillspeed, +2.042s
21. Jason Pribyl, Nitrous Competitions ADM Racing, +2.216s
22. Jin Nakamura, Hitech, +2.281s