Mercedes lost its way with the updated W17 during Bahrain Grand Prix qualifying at Sepang, with Toto Wolff admitting that the team was surprised by handling characteristics it had not encountered at any other point this season. Kimi Antonelli qualified fourth in 1:35.631, while George Russell could manage only eighth with a 1:35.871.
The roughly half-second gap separating Kimi Antonelli from the front represented a significant deficit for a car that has been the benchmark for much of the season. Red Bull and Ferrari were consistently faster over a single lap, while Mercedes struggled with excessive drag, low-speed understeer and difficulty finding the correct operating window for the W17 Evo.
Mercedes W17 Evo struggles during Sepang qualifying
Friday had already provided a warning. George Russell finished second and seventh across the two practice sessions, while Kimi Antonelli recorded fifth and eighth positions. The British driver had openly described a car that was not yet in the right place and a Mercedes team slightly out of rhythm, with setup changes required.
FP3 appeared to transform the picture. Kimi Antonelli set the fastest time, while George Russell finished fourth, six tenths behind. Mercedes seemed to have recovered, but qualifying produced a very different reality.
The result stands out particularly sharply given the performance level the Mercedes W17 has demonstrated this season. At Sepang, however, the updated car proved much more difficult to understand.
Kimi Antonelli still confident in Mercedes race pace
Kimi Antonelli was the stronger of the two Mercedes drivers. After responding positively in FP3, the Italian again produced the better result in Q3, completing his final attempt after leaving the pits alone.
Fourth place represented a reasonable recovery after a difficult weekend, and the grid situation improves further because Isack Hadjar must serve a five-place penalty for changing his internal combustion engine. That promotes Kimi Antonelli to third on the starting grid.
The championship leader explained that completing a clean lap had been particularly difficult because Mercedes had suffered repeated brake lock-ups since Friday. As a result, he had to leave some margin rather than push beyond the limit and risk another mistake.
“I’m surprised I managed to finish P4, which becomes P3 with Hadjar’s penalty,” Kimi Antonelli said. “With hindsight, I could have finished even further forward, between P2 and P3, but pole was out of the question today: Max had something extra.”
Antonelli says Mercedes was outside its operating window
The bigger concern for Mercedes is the balance of the updated car.
“We’re having a lot of balance problems,” Kimi Antonelli explained. “Today we were outside the window. With this asphalt, it’s definitely difficult to understand what the correct window is for the updated car.”
Sepang’s unusual surface has complicated the evaluation of Mercedes’ latest development package, making it difficult to establish exactly where the revised W17 needs to operate to extract its performance.
“We can’t understand which window this package needs to operate in,” Kimi Antonelli continued. “We’re in a better position for the race. Yesterday the pace wasn’t bad, but Red Bull and Ferrari are also very fast.”
That leaves the Italian cautiously optimistic for the Grand Prix despite Mercedes’ disappointing qualifying performance.
Toto Wolff surprised by new W17 behaviour
Toto Wolff was similarly puzzled by what Mercedes experienced during qualifying.
“It’s a difficult situation to understand,” Toto Wolff admitted. “We were caught by surprise by behaviours from the car that we haven’t had at any point during the year. The heat and the asphalt being so different from other circuits definitely had an influence.”
Mercedes is not the first Formula 1 team to encounter difficulties after introducing a major development package, but the contrast between FP3 and qualifying made the situation particularly confusing.
“The situation in FP3 with Kimi looked good, then the same problems appeared again,” Toto Wolff explained.
Mercedes identifies excessive drag and low-speed understeer
The Mercedes team principal identified two specific areas in which the W17 was losing performance.
“The car generates a lot of drag and we lose time to Max on the straights,” Toto Wolff said. “In addition, the drivers are suffering from a lot of understeer at low speeds. That has never happened to us this year.”
The straight-line deficit is particularly significant at Sepang because its layout combines demanding corners with sections where aerodynamic efficiency remains important. At the same time, the unexpected low-speed understeer makes it more difficult for the drivers to rotate the car and maintain confidence through the slower sections.
Those characteristics were not part of Mercedes’ usual behaviour earlier in the season, adding another layer of uncertainty to the team’s assessment of the latest package. Toto Wolff had already acknowledged that Mercedes still had untapped potential in its W17 development, but Sepang has created a new set of questions.
Mercedes needs data before judging its Sepang upgrade
The immediate priority is now to stop, analyse the data and understand why the W17 Evo moved outside its optimum operating window so dramatically.
Seeing the car that has set the benchmark during the season approximately half a second away from the front is unusual, but the circumstances at Sepang also make it dangerous to draw definitive conclusions from a single qualifying session.
The Bahrain Grand Prix at Sepang still offers Mercedes an opportunity to recover. Kimi Antonelli believes the race pace is stronger than the single-lap performance suggested, while the expected demands on tyre management could produce a different competitive picture over a full Grand Prix distance.
For now, however, Mercedes has a clear technical puzzle to solve: understanding why the updated W17 is producing more drag, suffering unusually severe low-speed understeer and proving so difficult to place inside its ideal balance window.
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