SEPANG
GRAND PRIX
A Binary 1702 experiment
Sepang: Nine years later
Formula 1 knows Sepang. It just doesn't know this Sepang.
The championship last raced here in October 2017. Max Verstappen had turned 20 the day before the race; on Sunday, he passed Lewis Hamilton for the lead and won. Sebastian Vettel started last and finished fourth. The fastest race lap was a 1:34.080.
Nine years later, those numbers tell us surprisingly little about what will happen this weekend.
The cars now generate their performance differently. The tyres are different. The regulations are different. Much of today's grid has never raced a Formula 1 car at Sepang. Even the teams that know the circuit are returning without the recent race data they normally accumulate year after year.
And Sepang is not an easy circuit to model in isolation. Its 5.543 kilometres combine long straights with sustained, loaded corners. The asphalt is abrasive. Heat changes the tyres. Tropical rain can change the track before strategy has time to catch up. Circuit guide ↗
That creates an unusual weekend.
Mercedes arrives with seven newly declared changes to its car. [source] Antonelli arrives with a 66-point championship lead — down from 81 before Baku. F1.com ↗ Pirelli has brought the C2, C3 and C4 compounds. And three drivers already carry grid penalties into the weekend. F1.com ↗
Each fact means something on its own.
Formula 1 knows Sepang. It just doesn't know this Sepang.
The championship last raced here in October 2017. Max Verstappen had turned 20 the day before the race; on Sunday, he passed Lewis Hamilton for the lead and won. Sebastian Vettel started last and finished fourth. The fastest race lap was a 1:34.080.
Nine years later, those numbers tell us surprisingly little about what will happen this weekend.
The cars now generate their performance differently. The tyres are different. The regulations are different. Much of today's grid has never raced a Formula 1 car at Sepang. Even the teams that know the circuit are returning without the recent race data they normally accumulate year after year.
And Sepang is not an easy circuit to model in isolation. Its 5.543 kilometres combine long straights with sustained, loaded corners. The asphalt is abrasive. Heat changes the tyres. Tropical rain can change the track before strategy has time to catch up. Circuit guide ↗
That creates an unusual weekend.
Mercedes arrives with seven newly declared changes to its car. [source] Antonelli arrives with a 66-point championship lead — down from 81 before Baku. F1.com ↗ Pirelli has brought the C2, C3 and C4 compounds. And three drivers already carry grid penalties into the weekend. F1.com ↗
Each fact means something on its own.
Sepang is where they begin interacting.
Malaysia 2017
Oct 1, 2017 · Sepang · 56 laps
Won the day after turning 20, passing Hamilton for the lead
Started P20, finished P4, set fastest lap (1:34.080)
DNF on lap 0 with battery failure
10 drivers raced here. 12 have not.
Alonso has raced here more than some drivers have completed full seasons.
Gasly's only previous Sepang start was his F1 debut.
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Mercedes Upgrade
Mercedes brought seven declared aerodynamic changes to the W17 at Sepang, concentrated around the floor and rear of the car: the floor board, leading edge, floor corner, floor body, rear suspension fairings, rear corner and rear bodywork.
Rather than seven separate ideas, they work as one aerodynamic package — controlling airflow through the floor and toward the rear of the car.
More downforce. More often.
Mercedes is trying to generate additional aerodynamic load while making the W17 less sensitive across different cornering conditions. The revised floor is designed to keep airflow attached across a wider operating window and feed the diffuser more effectively.
According to Antonelli, Mercedes estimates the complete package could be worth roughly 0.3 seconds per lap.
Sepang immediately stress-tests that idea.
Fast corners demand aerodynamic load, while the warm conditions and aggressive tarmac create high tyre degradation and overheating.
Friday exposed exactly that problem: Russell said he could feel the additional downforce, but the tyre overheating was effectively masking its benefit. Mercedes said it had not yet seen the step in lap time it expected from the new package.
Antonelli leads Russell by 66 points, but both now have the same upgraded W17 underneath them.
If Mercedes can unlock the package, the question becomes less about which driver has the better car and more about which driver extracts more from it over the remaining rounds.
Does a faster Mercedes protect Antonelli's lead — or give Russell a better weapon to attack it?
What to Watch
Antonelli vs Russell
The 66-point gap shrank by 15 points at Baku. Russell is the only driver who can realistically catch Antonelli, and he needs to start now. Same car, same upgrades, same conditions. Sepang removes excuses.
Does the upgrade work?
Seven changes to the W17. Mercedes has momentum but Sepang is a different test. The upgrade either confirms their trajectory or exposes a gap between simulation and reality.
Tyres and weather
Pirelli brought the aggressive C2-C4 compounds. Sepang heat destroys tyres. Afternoon rain is always possible. Strategy will matter more here than at most circuits.
Can Sepang change the shape of the 2026 championship?