The first Formula E Gen4 group test has been taking place at Monteblanco in Spain this week, with five manufacturers in action behind closed doors.
The Race has tracked the running closely through its network of sources and uncovered key information about the test, which has been structured as six half day sessions running between Tuesday and Saturday afternoon.
In the test - which is being organised by the manufacturers themselves - Jaguar, Porsche, Nissan, Stellantis and Lola have all conducted initial reliability runs.
The plan had been to run on Tuesday, Thursday and Saturday but this changed after poor weather in the area meant a change to running on Wednesday, although manufacturers were still limited to the six sessions across the test.
Laptimes have not been disclosed outside of the teams' own knowledge and different power modes are being used across the entrants. A specific track layout with a temporary chicane is being used.
But the first two days (four sessions of action) have pointed to an early reliability leader being Stellantis, with 179 laps accrued so far.
Its surprise Formula E returnee driver Andre Lotterer conducted some longer 10-lap performance runs on Tuesday afternoon alternating between push and cooling laps in what is believed to be the first real Bridgestone tyre learning work by a manufacturer.
The Race revealed earlier this week that Lotterer was testing for Stellantis, while Nick Cassidy - newly signed to its rebranded Citroen team - is also believed to be in attendance at the test and is getting his first experience on Friday, should the weather not be too extreme.
Nissan is believed to have completed 108 laps over the first two days with just Benoit Treluyer driving, while Jaguar conducted 84 laps in total with Stoffel Vandoorne and Antonio Felix da Costa aboard its test car.
Jaguar appeared to curtail its Wednesday morning run and spent the majority of that session in the pits, completing just 18 laps in total.
More structured performance runs followed for Jaguar towards the end of Wednesday when 43 laps were completed, one more than Nissan achieved in that session.
Tuesday and Wednesday lap count
Stellantis - 179 laps
Nissan - 108 laps
Jaguar - 84 laps
Porsche - 32 laps
Lola - 7 laps
Test entry list
Stellantis - Andre Lotterer/Nick Cassidy
Jaguar - Stoffel Vandoorne/Antonio Felix da Costa
Nissan - Benoit Treluyer
Porsche - Nico Mueller
Lola - Zane Maloney/Lucas di Grassi/Hugh Barter
Porsche missed the morning session on Wednesday and totalled 33 laps across the two days of Tuesday and Wednesday with newly promoted factory racer Nico Mueller at the wheel, although minimal performance runs have so far been conducted.
Stellantis, Nissan and Jaguar therefore completed all four sessions as of Wednesday evening, with Lola and Porsche running in three.
There was no running on Thursday due to poor weather, meaning that Lola and Porsche will now be able to use three sessions over the course of Friday and Saturday, while the other three manufacturers only have two remaining sessions available to them.
Lola is understood to have only completed fitful in-and-out installation laps with no performance runs in the opening two days, as it began to get its car completely functional.
Although no laptimes have been seen by The Race, one leading paddock figure said that "Stellantis and Jaguar were reasonably even, with Nissan a couple seconds off them" while Porsche and Lola "had not completed what you would consider representative times yet".
One driver at the test told The Race that he was "amazed" how quick the Gen4 car is and "already just sitting in it feels so much more like being in a proper racecar".
Another driver at the test said: "This thing is really good. Yes, it's early days and nobody is doing many laps, but it's seriously fast.
"It's well-built too, the whole quality of the car has just gone massively up, the technology and the quality," he added.
Porsche team principal Florian Modlinger told The Race on Thursday that Porsche was "focusing on our schedule, our programme, and it's the first time that we hit the track with this car, and until now, everything goes according to plan, except the weather forecast".
"We had to reshuffle the sessions a bit when driving, which changed a bit, but the rest is slowly ramping up, and until now we have [completed] three sessions with three more to come. We are in line with our plan and programme that we are setting ourselves."
It is anticipated that the first wet weather running could be undertaken on Friday using the new Bridgestone wet rubber which will be taken to races in addition to the regular dry specification of tyres.
