Ferrari telemetry mystery: Lewis Hamilton’s ERS deficit vs Charles Leclerc at Suzuka. Telemetry data from the 2026 Japanese Grand Prix.

Data comparison with Charles Leclerc highlights unexpected deficit in straight-line performance

The 2026 Japanese Grand Prix provided a fascinating intra-team comparison at Ferrari, with telemetry data revealing a significant and somewhat surprising difference between Lewis Hamilton and Charles Leclerc — particularly in straight-line speed and energy deployment.

While both drivers raced under similar conditions, the data suggests that the Briton may have been dealing with a lack of electrical power during key phases of the race, especially when attempting to defend his position.

Clear speed deficit on the straights

A closer look at laps 42 and 43 highlights the issue. On lap 42, Charles Leclerc reached a top speed of 317 km/h without the benefit of slipstream or overtake mode. In contrast, Lewis Hamilton could only manage 307 km/h under similar conditions — a significant gap in Formula 1 terms.

The difference becomes even more striking on the following lap. With the advantage of slipstream, the Monegasque peaked at 330 km/h while chasing his Maranello teammate. However, when the positions were reversed, Lewis Hamilton was unable to exceed 306 km/h, despite having the same theoretical tools at his disposal.

Lost time instead of gaining

The time delta on the main straight further underlines the anomaly. Running behind the Briton, Charles Leclerc gained nearly four tenths of a second, closing rapidly thanks to superior straight-line speed. Yet when Lewis Hamilton found himself in the Monegasque’s slipstream, he actually lost around a quarter of a second — an unusual scenario given the expected aerodynamic advantage.

This imbalance also played a role in George Russell’s overtake. Despite being further back than Leclerc had been, the Mercedes driver was able to close the gap more effectively and complete the move with relative ease, suggesting that Hamilton was particularly vulnerable on the straights.

Possible ERS deployment issue

All signs point toward a potential issue with Lewis Hamilton’s energy recovery system (ERS) or its deployment. Whether it was a temporary malfunction, a software limitation, or a strategic miscalculation remains unclear, but the data indicates that the seven-time Formula 1 world champion did not have access to the full electrical boost typically available in these situations.

In modern Formula 1, where hybrid power units rely heavily on precise energy deployment for both attack and defense, even a small deficit can translate into a major disadvantage — especially on long straights like those at Suzuka.

Impact on Ferrari’s race

For Ferrari, this discrepancy likely had a direct impact on the race outcome. While Charles Leclerc was able to maximise his performance and secure a strong result, Lewis Hamilton was left exposed, unable to defend effectively against faster-approaching rivals.

The situation raises important questions for the Maranello team ahead of the upcoming races. If the issue was indeed technical, it will need to be identified and resolved quickly to avoid compromising future performances.

The Suzuka telemetry therefore suggests that Hamilton’s struggles were not purely down to pace or tyre management, but rather to a lack of available power at critical moments — a factor that proved decisive in the closing stages of the race.