Mercedes' Singapore upgrade gamble: Toto Wolff fears half-second lap time loss

Mercedes head into the Singapore Grand Prix facing serious questions about their latest technical package after broadcaster Will Buxton revealed that team principal Toto Wolff believes the upgrades may have cost the car as much as four or five tenths of a second per lap — the opposite of what was intended.

The Brackley squad introduced sweeping changes to almost every body surface at the Malaysian Grand Prix in Sepang, targeting improved medium-to-high speed downforce. The team had anticipated a gain of roughly three tenths of a second, but results at the Sepang International Circuit fell well short of expectations. Kimi Antonelli qualified third and finished second, while George Russell qualified seventh before retiring with a power unit issue.

“They had a big upgrade,” Buxton said on the Up To Speed podcast. “Is it a case — and I guess we may only know this weekend — do we feel it’s a case of the upgrade hasn’t worked, or that it was track-specific and that they didn’t get what they wanted out of it?”

Buxton explained the technical logic behind the package: modifications to the floor and sidepods were designed to add downforce, accepting a small loss of straight-line speed in exchange for time recovered through the corners. The maths, however, has not worked out as planned.

“They were expecting to gain about three tenths of a second,” Buxton said. “As it is, Toto thinks they may have lost around four or five. So, not a gain — potentially a loss.”

According to Buxton, Mercedes plan to run back-to-back comparison tests in Singapore between the old and new specifications to isolate whether the issue is fundamental or circuit-specific. The task is complicated by the Singapore weekend’s sprint format, which limits the team to a single free practice session before qualifying.

The outcome of those tests will be closely watched. If the upgrade proves genuinely counterproductive rather than simply ill-suited to Sepang’s characteristics, Mercedes face a difficult decision about which specification to race for the remainder of the season.