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rear-end stability and overheating administration


Ferrari was not excellent. Quite the opposite, throughout the fourth Friday of the 2025 Method 1 season, many issues didn’t work for the Maranello crew. To start with, it have to be stated that with the brand new ground there was a must experiment. Furthermore, the primary free observe session on the 5.412-kilometre Bahrain Worldwide Circuit in Sakhir was virtually ineffective because of the soiled observe, to not point out the tire overheating and the setup of the Italian automotive which, with a unique weight distribution, was not straightforward to get proper.

As soon as once more, McLaren confirmed itself because the automotive to beat over a single lap. In FP2 in Bahrain, Oscar Piastri put a full 0.527 seconds on the primary chasing automotive, which was George Russell’s Mercedes, and 0.540 seconds on Charles Leclerc, who completed fourth. The MCL39 appeared exact, balanced, and particularly able to producing grip in each part of the nook, dominating each sector and constructing its principal benefit in Sector 2, the place it gained 0.327 seconds on its rivals.

Charles Leclerc, for his half, confirmed an SF-25 that was not significantly well-balanced and unable to ship high efficiency over one lap. The entrance finish appeared pretty responsive, and the power understeer that had stricken the automotive in earlier GPs remained—although milder—mixed with slight oversteer on nook exit, particularly popping out of turns 13-14. However the primary puzzle stays the conduct of the rear underneath traction.

The direct comparability with Oscar Piastri begins already in flip 1, the place Charles Leclerc brakes barely later however nonetheless manages to decelerate successfully, sufficient to get again on the throttle concurrently the Australian. On this a part of the observe, one of the crucial essential components in braking administration is doubtless the brake steadiness, specifically the distribution of braking between the entrance and rear axles.

Certainly, all through the session, the 2 Ferrari drivers acquired radio solutions to regulate it nook by nook, with the intention of enhancing braking stability and stopping lockups. Drivers can tweak the brake steadiness instantly from the steering wheel, adjusting it to their choice. Typically, to keep away from entrance locking, the steadiness is shifted barely to the rear.

Nonetheless, this adjustment have to be a compromise: an excessive amount of rearward braking can destabilize the automotive or trigger rear locking. Discovering the precise compromise between entrance and rear is among the keys, particularly for Charles Leclerc, given his alternative to change his braking model in an try to enhance his efficiency.

Transferring on to the S-bend of turns 2-3, Oscar Piastri manages to go full throttle earlier, increase velocity for the next straight. Charles Leclerc, as a substitute, modulates the throttle extra cautiously, reaching 100% throttle barely later. Then comes flip 4, a nook the place the SF-25 struggled to hit the apex throughout pre-season testing, however in the present day the state of affairs is totally different. The Monegasque driver works to mitigate attainable understeer on entry.

He does so by braking a couple of meters earlier, organising the nook entry optimally, hitting the apex completely, and even going by means of it with a ten kilometers per hour delta over the Australian driver. This exhibits a major step ahead for the Ferrari. Nonetheless, on exit, Charles Leclerc is a bit late on the throttle, because the rear nonetheless wanted a couple of extra meters to settle and full the ultimate part of the nook easily.

In corners like this, but additionally in 8, 10, and 14, the dampers come into play—the shock absorbers. On a observe like Bahrain, the load switch between braking and traction should occur in a short time. A quick compression of the rear is required to make sure grip for the pushed wheels, and a quick decompression of the entrance to launch the load and facilitate the transition.

If the dampers—referring to the F1 automotive’s shock absorbers—don’t reply optimally, then the load will not be transferred shortly sufficient, and traction can not optimally switch all of the engine’s energy to the bottom. And that is precisely what was lacking on nook exit from flip 4 on automotive quantity 16, a side that value small fractions of a second in comparison with the spectacular McLaren.

Even within the snake part, specifically turns 5-6-7, the Ferrari SF-25 automotive holds its personal towards McLaren, with Charles Leclerc taking flip 6 at 9 kilometers per hour extra. Nonetheless, he once more loses one thing in flip 7, the place he lifts off an excessive amount of, maybe to handle the oversteer throughout roll. From flip 11 onward, the MCL39 begins to tug forward: on this very quick nook, the place one enters at 300 kilometers per hour and takes it at 162 kilometers per hour, the British automotive exhibits glorious steadiness.

It sticks to the observe floor while not having to right the steering even by 1 millimeter, however most of all, it manages to go full throttle many meters sooner than the Ferrari. This interprets right into a achieve of a couple of tenth and a half. Even in flip 13, Oscar Piastri finds rather more grip, particularly on exit, the place the automotive from Maranello, after a very good entry onto the innermost curb, makes small corrections to tame the rear.

Even right here, the achieve for the papaya-colored automotive is appreciable. For sure, this time loss from mid-lap onward is attributable to the much-discussed overheating that impacts all automobiles, as Ferrari crew principal Frederic Vasseur himself confirmed in interviews. McLaren suffers much less, because it manages temperatures higher with a extra environment friendly aerodynamic bundle.

When the observe floor is simply too sizzling, in actual fact, the tire tends to lose grip and the rear turns into unstable, particularly in lengthy, quick corners. Briefly, the SF-25 is making progress, however the conduct of the rear, between mechanical and thermal setup, stays a crucial difficulty. McLaren, then again, as soon as once more appeared very strong in each area, capable of finding grip the place others are clearly struggling.

— see video above —

Ferrari's challenge: rear-end stability and overheating control | Leclerc - Piastri telemetry data

David Carter

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