Rodin Motorsport's Maxim Rehm topped the times on the first day of this week's official Snetterton test on Tuesday.
On a day which saw variable weather conditions, the German driver recorded his best time of 1m39.735s in the fourth and final session, putting him just 0.012s ahead of teammate Martin Molnar, who was quickest in a rain-affected third session. Spa-Francorchamps winner Abbi Pulling completed an all-Rodin top-three split by just 0.030s.
Hitech's Deagen Fairclough was just over a tenth of a second further back in fourth courtesy of his his session two effort, in which he was the quickest runner, while session one topper Dante Vinci (Hillspeed) was fifth thanks to his final session lap. The top-five were covered by just over a quarter of a second.
Rodrigo Gonzalez was the lead VRD Racing runner in sixth, just under half a second away from the top five, and ahead of Hillspeed's Aurelia Nobels, who set her best lap in session two, in which she was third quickest.
An unnamed Fortec driver posted the eighth quickest time with a final session effort, 0.090s ahead of VRD's championship leader Nikita Bedrin, with Elite's Kyuho Lee completing the top-10, which was covered by 1.078s.
A total of 18 drivers participated in the test today, with several teams handing official testing debuts to new drivers. Swedish contender Leon Hedfors was 15th for Xcel Motorsport, while Maltese driver Jacob Micallef was just behind for Hitech.
GB4 podium finisher Emmilio Valentino Del Grosso also sampled a GB3 car for the first time with his current GB4 squad Elite Motorsport.
Testing resumes at Snetterton tomorrow (Wednesday) with four more sessions.
GB3 Championship, partnered by the BRDC, Snetterton official test, day one combined result:
1. Maxim Rehm, Rodin Motorsport, 1m39.735s
2. Martin Molnar, Rodin Motorsport, +0.012s
3. Abbi Pulling, Rodin Motorsport, +0.030s
4. Deagen Fairclough, Hitech, +0.164s
5. Dante Vinci, Hillspeed, +0.234s
6. Rodrigo Gonzalez, VRD Racing, +0.724s
7. Aurelia Nobels, Hillspeed, +0.817s
8. 'Fortec', Fortec Motorsports, +0.971s
9. Nikita Bedrin, VRD Racing, +1.061s
10. Kyuho Lee, Elite Motorsport, +1.078s
11. Ricardo Baptista, Xcel Motorsport, +1.107s
12. Peter Bouzinelos, Hillspeed, +1.193s
13. Yuhao Fu, Hitech, +1.265s
14. Lewis Gilbert, Arden Motorsport, +1.334s
15. Leon Hedfors, Xcel Motorsport, +1.570s
16. Jacob Micallef, Hitech, +1.639s
17. Patricio Gonzalez, VRD Racing, +1.739s
18. Emmilio Valentino Del Grosso, Elite Motorsport, +3.028s