Why Mercedes' Bahrain GP enhancement remains a "significant uncertainty"
The Mercedes squad has made a bold move by unveiling a significant aerodynamic update package at a venue Formula 1 hasn’t raced at since 2017. Has it backfired?
Likely not – however, due to the magnitude of the upgrade, Mercedes has rolled it out on both cars, preventing them from conducting direct comparisons between the previous and new setups under identical conditions. This has complicated their ability to grasp why the W17 appears to struggle significantly with the abrasive surface at Sepang.
Championship frontrunner Kimi Antonelli clocked the fourth-fastest time in qualifying after a misstep in Q2 necessitated another set of Pirelli C4 soft tyres, leaving him with just one for Q3. George Russell qualified eighth, though both Mercedes drivers will move up a position on the grid because of Isack Hadjar's engine penalty.
"That is the big question mark," Russell remarked when asked by Motorsport.com if the team found it challenging to tap into the new package's potential.
"If we could have done a direct back-to-back comparison, that would have been ideal to know, but that's the nature of this sport.
"If I had put the upgrade package on last week, even if it had performed worse, we likely still would have been on pole, and we'd be calling it fantastic. Conversely, if we had the old car here, maybe the result would have been even poorer.
"So that's the challenge. As a team, we have yet to experience, let’s say, a bad race this whole season, and this was clearly a very disappointing qualifying for us."
The complete sidepod design of the W17 has transformed, along with much of the underlying structure
The Mercedes update includes a redesigned floor with significant alterations to the leading edge, diffuser, and components around the rear wheels. More importantly, it features a markedly different sidepod design which necessitated a complete overhaul of the internal cooling architecture.
Consequently, it's not feasible to alternate between the two specifications during a race weekend.
What has truly bewildered the team is the W17's evident struggle with the notably rough track surface at Sepang. It's improbable that the upgrade package caused this, but it complicates efforts to understand and optimize it since there isn't a comparable data set for the previous specification.
"It's very challenging to comprehend," stated team principal Toto Wolff.
"We encountered some unexpected car behavior on Friday that we hadn’t seen all year. But you could argue that it’s very hot and the tarmac is quite different from all the other tracks.
"It looked really promising in the morning [when Antonelli led FP3 by 0.278s over Max Verstappen, who later secured pole]. We seem to have, at least with Kimi, made progress in understanding.
"However, qualifying seemed to revert to what we observed previously. Just lacking performance.
"It appears we’re quite draggy as it’s the first time we’re losing significant time on the straights, especially to Max. Additionally, through low-speed corners, we struggle to turn the car. There’s just too much understeer.
"Overall, these are issues we haven’t encountered all year."
Antonelli's qualifying was hindered by a track-limits violation in Q2
Antonelli and Russell certainly seemed to regress compared to their competitors between the final practice session and qualifying. Russell was 0.741s adrift of Verstappen's pole time, despite completing the usual two runs on fresh tyres in Q3.
Championship leader Antonelli had a lap invalidated in Q2 due to a track-limits infringement, compelling him to attempt another lap with a new set of tyres initially intended for Q3. This left him with only one chance for a flying lap in Q3 because the C4 hasn't demonstrated enough durability at Sepang for multiple runs.
All drivers have faced a low-grip surface that is extremely abrasive, attributed to the more open nature of the aggregate. This characteristic has been present since the circuit's opening in 1999; the goal was to make the surface less slippery in wet conditions and to facilitate quicker drainage and drying after rainfall.
"Clearly, this circuit is somewhat of an anomaly regarding the tarmac's abrasiveness," Russell noted.
"Lap times from seven years ago were about six or seven seconds faster, and at certain sections of the track, it feels like you're driving on gravel, which affects everyone. However, it's evidently impacting us more than others.
"All the data indicates it’s [the upgrade] an improvement, but in this sport, we must focus on lap times rather than numbers. The figures look perfectly fine and align with expectations.
"Yet, the outcome wasn’t."
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