With the DTM completing set-up work for TV production during the day, the on-track running didn’t begin until 5pm in the evening and continued well into the dark - with the chequered flag waved at 10pm.
It was reigning ADAC GT Masters champion Feller who made the most of the conditions, lapping the Portuguese circuit in 1m41.573s to maintain Audi’s unbeaten run in pre-season testing so far.
Preining put Porsche in second ahead of the Stuttgart-based manufacturer’s full-time debut in the DTM, finishing less than a tenth off the pace of Feller with a time of 1m41.658s.
Attempto Audi’s Mariuz Zug once again featured near the front of the pack after setting the overall quickest time in Hockenheim earlier this month, finishing third behind Feller and Preining with a 1m41.757s flyer.
Team Rosberg’s Nico Muller made it three Audis in the top four as he looks to bounce back from a difficult 2021 season, ending the day just over three tenths off the pace with the latest version of the R8 LMS GT3.
The BMW contingent was led by factory driver Sheldon van der Linde, the South African setting the fifth-quickest time in the new M4 GT3 ahead of Schubert teammate Philipp Eng.
The German manufacturers monopolised the top six spots on Day 1 of testing, with Lamborghini securing the honour for best-of-the-rest thanks to Nicki Thiim’s effort of 1m41.940s aboard the T3 Huracan GT3.
Mirko Bortolotti finished just two spots behind in a Lamborghini entered by the Grasser Racing Team, with two-time DTM champion Marco Wittmann sandwiched between the two in eighth in his Walkenhorst BMW.
The top 10 was completed by three-time DTM title winner Rene Rast, who posted a solid time of 1m41.994s on his return to the series with Abt Audi.
Mercedes had a fairly low-key session despite being present with eight factory-supported cars, with HRT’s new signing Luca Stolz the brand’s best representative in 16th with a time that was six tenths slower than Feller’s benchmark.
Reigning champion Maximilian Gotz was only 22nd in his Winward Mercedes, albeit only nine tenths slower than Feller as the majority of the field was separated by less than a second in an ultra-competitive session.
The two Red Bull-backed Ferraris also had a relatively average test at Portimao, with Felipe Fraga ending up 17th quickest and six tenths off the pace, and Nick Cassidy languishing in 23rd place in the sister AlphaTauri-liveried car.
Cassidy, who was still only 0.940s slower than the pacesetter, will hand over the car to WRC legend Sebastien Loeb on Wednesday ahead of the Frenchman’s DTM debut later this weekend at Portimao.
Elsewhere, Ben Green got to complete a maiden DTM test as a reward for winning the GT4-based DTM Trophy series last year. The British driver ended up 28th quickest in an HRT-entered Mercedes, beating the GRT Lamborghini of Formula 2 convert Alessio Deledda.
Of the 29 full-time cars entered for the full season, only the Winward Mercedes of Lucas Auer was absent from the day’s running.
Portimao DTM test - Day 1 results:
| Pos | Driver | Team | Time | Laps | Gap |
|---|---|---|---|---|---|
| 1 | Ricardo FELLER | ABT Sportsline | 1:41.573 | 70 | - |
| 2 | Thomas PREINING | KÜS Team Bernhard | 1:41.658 | 66 | +0.085 |
| 3 | Marius ZUG | Attempto Racing | 1:41.757 | 68 | +0.184 |
| 4 | Nico MÜLLER | Team Rosberg | 1:41.882 | 37 | +0.309 |
| 5 | Sheldon VAN DER LINDE | Schubert Motorsport | 1:41.919 | 53 | +0.346 |
| 6 | Philipp ENG | Schubert Motorsport | 1:41.933 | 61 | +0.360 |
| 7 | Nicki THIIM | T3 Motorsport | 1:41.940 | 54 | +0.367 |
| 8 | Marco WITTMANN | Walkenhorst Motorsport | 1:41.947 | 59 | +0.374 |
| 9 | Mirko BORTOLOTTI | GRT | 1:41.976 | 56 | +0.403 |
| 10 | René RAST | Team ABT | 1:41.994 | 58 | +0.421 |
| 11 | Esteban MUTH | Walkenhorst Motorsport | 1:42.020 | 78 | +0.447 |
| 12 | Clemens SCHMID | GRT grasser-racing.com | 1:42.045 | 66 | +0.472 |
| 13 | Kelvin VAN DER LINDE | ABT Sportsline | 1:42.045 | 62 | +0.472 |
| 14 | Laurens VANTHOOR | SSR Performance | 1:42.054 | 61 | +0.481 |
| 15 | Dennis OLSEN | SSR Performance | 1:42.068 | 57 | +0.495 |
| 16 | Luca STOLZ | Mercedes-AMG Team HRT | 1:42.167 | 44 | +0.594 |
| 17 | Felipe FRAGA | Red Bull AlphaTauri AF Corse | 1:42.172 | 71 | +0.599 |
| 18 | Dev GORE | Team Rosberg | 1:42.280 | 58 | +0.707 |
| 19 | Arjun MAINI | Mercedes-AMG Team HRT | 1:42.338 | 42 | +0.765 |
| 20 | Rolf INEICHEN | GRT | 1:42.433 | 54 | +0.860 |
| 21 | Maro ENGEL | Mercedes-AMG Team GruppeM | 1:42.456 | 75 | +0.883 |
| 22 | Maximilian GÖTZ | Mercedes-AMG Team WINWARD | 1:42.466 | 47 | +0.893 |
| 23 | Nick CASSIDY | Red Bull AlphaTauri AF Corse | 1:42.513 | 73 | +0.940 |
| 24 | Mikael GRENIER | Mercedes-AMG Team GruppeM | 1:42.535 | 57 | +0.962 |
| 25 | Maximilian BUHK | Mercedes-AMG Team Mücke | 1:42.824 | 35 | +1.251 |
| 26 | David SCHUMACHER | Mercedes-AMG Team WINWARD | 1:43.320 | 50 | +1.747 |
| 27 | Esmee HAWKEY | T3 Motorsport | 1:43.751 | 39 | +2.178 |
| 28 | Ben GREEN | Mercedes-AMG Team HRT | 1:43.789 | 35 | +2.216 |
| 29 | Alessio DELEDDA | GRT grasser-racing.com | 1:43.957 | 55 | +2.384 |
| 30 | Lucas AUER | Mercedes-AMG Team WINWARD |
