Toto Wolff has revealed that every Mercedes power unit suffered from a straight-line performance problem during the Belgian Grand Prix weekend, leaving the team without its expected level of power on Spa-Francorchamps’ fastest sections. The issue proved particularly costly for George Russell, whose W17 was overtaken by both Ferrari drivers on the Kemmel Straight before his first-lap contact with Lewis Hamilton brought his race to an early end.
Mercedes nevertheless leave Spa with two very different but equally significant conclusions. The first is Andrea Kimi Antonelli’s return to victory, which allowed the Italian driver to extend his Formula 1 championship advantage over his main rivals. The second is far more painful: George Russell’s retirement at Turn 5 on the opening lap following accidental contact with the Ferrari driven by his former team-mate Lewis Hamilton.
Mercedes analyse why George Russell was vulnerable on the Kemmel Straight
Inside Mercedes, the focus is not limited to the consequence of the incident, namely George Russell’s retirement after making contact with Lewis Hamilton. The team is also analysing why George Russell found himself in that position on the circuit and became so vulnerable before the braking zone.
The television pictures made the problem particularly clear. On the Kemmel Straight, George Russell’s Mercedes was effectively swallowed up by the Ferraris of Charles Leclerc and Lewis Hamilton. Charles Leclerc benefited from the slipstream as well as extremely powerful electrical deployment after exiting Eau Rouge, while Lewis Hamilton also carried enough momentum to move ahead.
Straight-line efficiency had already been a central theme for Mercedes before the race. The team introduced subtle W17 front-wing revisions aimed at reducing drag at Spa, where the balance between aerodynamic load and top speed is particularly important.
After losing ground on the Kemmel Straight, George Russell attempted to fight back around the outside and drew alongside Lewis Hamilton’s Ferrari once again. As the two cars entered Turn 5, they made contact. George Russell suffered the greater consequences, coming to a halt in the run-off area and finding himself unable to continue the race.
Toto Wolff calls the first-lap clash a racing incident
After the race, Toto Wolff addressed both the dynamics of the accident and what he regarded as the more important technical concern: the power-unit problems experienced on the straights of the Ardennes circuit.
“There are two aspects,” Toto Wolff explained. “The first concerns the race and the accident that happened. It was unfortunate for us because we lost a lot of points with George, both in the Constructors’ Championship and in the Drivers’ Championship.”
“On the Kemmel Straight, he was running out of available energy, but by that point it was already too late. He attempted the move around the outside, braking very late, and that should have been his corner. However, it was a racing incident. These things can happen at the front, in the middle of the field or at the back of the grid.”
The weekend had always been expected to represent an important technical examination for the Brackley team, with Toto Wolff warning beforehand that Spa would provide a major test of Mercedes’ overall competitiveness.
Mercedes power-unit problem affected every engine at Spa
Toto Wolff then confirmed that the straight-line weakness was not isolated to George Russell’s car. According to the Mercedes team principal, the problem affected every power unit produced by the manufacturer, reducing the available performance on Spa’s long full-throttle sections.
“Then we had a problem that affected all the Mercedes engines,” Toto Wolff revealed. “We were lacking power on the straights, and that penalised him enormously. The responsibility is 100 per cent ours.”
“As a team, we are giving everything. We have the most powerful power unit, a car capable of winning, and everyone is doing their best to minimise mistakes. However, mistakes happen because we are human.”
The loss of electrical deployment was especially damaging at Spa because the run from Eau Rouge towards Les Combes is one of the most important overtaking zones on the calendar. A car that runs out of usable energy too early can become highly vulnerable to rivals benefiting from a tow and stronger deployment.
Mercedes had worked extensively to optimise the W17 for those conditions, but the power-unit problem prevented George Russell from defending effectively. The issue therefore compromised the team despite the car’s underlying competitiveness and Andrea Kimi Antonelli’s ability to win the race.
Reliability problems continue to cost Mercedes points
Toto Wolff also placed the Spa setback within the broader context of Mercedes’ season, which has repeatedly combined strong performance with costly reliability problems and missed opportunities.
“We let Kimi down at Silverstone, where George achieved a podium that was probably better than the car’s real result deserved,” Toto Wolff said. “Then one retired in Montreal and the other in Barcelona. That is, to some extent, the story of our season. It is a technical sport and a mechanical sport.”
The contrast between the two Mercedes drivers’ Belgian Grand Prix outcomes reflected that unpredictable pattern. Andrea Kimi Antonelli converted the W17’s performance into victory and strengthened his championship position, while George Russell’s race ended before he could complete the opening lap.
George Russell has previously explained the difficulties of adapting to the W17’s characteristics, using an unusual Mona Lisa comparison to describe Mercedes’ driving-style challenge. At Spa, however, the decisive problem was not simply how the car needed to be driven, but the reduced power available when George Russell needed to defend.
Toto Wolff prefers a fast but unreliable Mercedes
Despite the frustration of losing another significant points haul, Toto Wolff reiterated that he would rather have a very fast engine and car with reliability weaknesses than face the opposite situation. In his view, it is easier to make a quick car reliable than to transform a dependable but fundamentally uncompetitive package into a winning machine.
“I am proud to be part of the HPP and MGP organisations,” Toto Wolff said, referring to Mercedes’ power-unit and chassis operations. “They are groups of people who give everything they have.”
“This year, we have produced a genuinely very strong product, and I would rather have to resolve reliability problems than try to make a slow engine or a slow car fast.”
That philosophy reflects Mercedes’ confidence in the fundamental performance of its 2026 package. Andrea Kimi Antonelli’s Belgian Grand Prix victory demonstrated that the W17 possesses race-winning speed, but Toto Wolff acknowledged that performance alone will not be sufficient if technical failures continue to remove cars from contention.
“We are giving 100 per cent and we must continue doing that because we have lost a lot of points specifically because of reliability,” Toto Wolff concluded. “We should have been much farther ahead in the championship.”
Mercedes therefore leave Spa with both reassurance and concern. Andrea Kimi Antonelli’s victory confirmed the strength of the car, while the power-unit issue and George Russell’s retirement underlined how reliability and energy deployment can still undermine an otherwise highly competitive package.
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