Nitrous Competitions ADM Racing's Luke Hilton improved his time from day one by over two tenths of a second to end the media day test on top at Donington Park.
Having set a 1m28.763s yesterday, he posted a 1m28.546s in the third of Thursday's four sessions to end the second day fastest too, but was unable to repeat yesterday's lockout, with Fortec's Franek Cegielski and Elite's Fred Green also topping sessions throughout the second day.
Hilton's outright pace put him just 0.057s ahead of Fortec's Thomas Ingram Hill, who also set his best time in session two, with Green's end of day effort putting him third.
KMR Sport's Alex O'Grady and Cegielski were fourth and fifth courtesy of their session three laps, with Douglas Motorsport's Dayton Coulthard sixth and only 0.089s further back.
Connor Willis was the lead Hillspeed runner in seventh, 0.013s ahead of the second Elite Motorsport machine of Matan Achituv.
Willis' teammate Enzo Hallman and Pace Performance's Torrin Byrne completed the top-10, which was covered by 0.920s.
Ahead of GB4's biggest season yet in terms of driver numbers, 27 drivers participated in the second day of testing. Action resumes with two days on the Silverstone Grand Prix circuit next week.
GB4 Championship, partnered by the BRDC, Donington Park official test day two top-10:
1. Luke Hilton, Nitrous Competitions ADM Racing, 1m28.546s
2. Thomas Ingram Hill, Fortec Motorsports, +0.057s
3. Fred Green, Elite Motorsport, +0.324s
4. Alex O'Grady, KMR Sport, +0.352s
5. Franek Cegielski, Fortec Motorsports, +0.540s
6. Dayton Coulthard, Douglas Motorsport, +0.629s
7. Connor Willis, Hillspeed, +0.750s
8. Matan Achituv, Elite Motorsport, +0.763s
9. Enzo Hallman, Hillspeed, +0.860s
10. Torrin Byrne, Pace Performance, +0.920s
Click here for full result.
