McLaren has brought revised diffuser and exhaust solutions to the 2026 Dutch Grand Prix as it looks to maximise rear-end stability on the MCL40 at Zandvoort. The changes are another careful refinement of the car rather than a complete aerodynamic revolution, but they create an important challenge for the engineers: every new component alters the MCL40’s aerodynamic map and introduces an inevitable set-up compromise that must be understood on track.
The real task during practice will therefore be to decipher how the car’s dynamic behaviour has changed, find the right set-up and unlock the full performance of the new package. McLaren arrives in the Netherlands having already made significant progress with the MCL40 and is continuing the rear-end development programme for the Dutch Grand Prix.
McLaren MCL40 gets new diffuser and exhaust updates
The competition is certainly not standing still. It has become increasingly clear during the first season of Formula 1’s new technical regulations that upgrades can reshape the competitive order from one race to the next.
Building on the work carried out in Budapest, McLaren has chosen to introduce an important rear-end update at Zandvoort while reportedly preparing a more substantial package for Baku. The Woking team is also working with the greater aerodynamic development freedom acquired from 1 July.
The main focus has been the MCL40’s diffuser, a crucial area for managing vertical aerodynamic load and providing the correct level of rear stability. Several aerodynamic elements have been reshaped, while a greater number of small flaps have also appeared.
The other visible development concerns the exhaust area, where McLaren is attempting to exploit the exhaust gases generated under acceleration.
Although the historic British team cannot adopt a solution as extreme as Ferrari’s — with the Maranello engineers having managed the transmission dimensions at the design stage to exploit the regulations more aggressively — the technical group led by former Red Bull engineer Rob Marshall has added a type of lateral ramp attached to the FIA-mandated crash structure.
McLaren has also replaced the small monkey seat with a grid-like element. The comparison with Ferrari is particularly interesting given the extensive SF-26 aerodynamic changes introduced for Zandvoort.
Why McLaren’s Zandvoort upgrades create a set-up challenge
One important qualification remains: outright superiority also depends on the specific characteristics of each circuit and on how effectively engineers can adapt the car once it reaches the track. Both factors are extremely important. In fact, they are fundamental to understanding just how difficult the first season under the FIA’s new regulatory cycle has been to manage in every respect, regardless of the quality of the original design.
A decisive technical dynamic determines the true strength of any upgrade. Introducing a single new component does not simply add a fixed amount of downforce to the car. It can significantly alter the entire aerodynamic map.
The centre of pressure moves, changing the balance of the car and forcing engineers to reconsider its settings in order to recover the desired dynamic behaviour.
The ‘set-up tax’ that can reduce the value of an F1 upgrade
This is where the so-called “set-up tax” comes into play. A new component, for example, might theoretically be worth as much as two and a half tenths of a second, while at the same time requiring mechanical compromises that cost one tenth on the circuit.
The essential objective for every Formula 1 team is therefore to maximise the net gain and ensure that the updates introduced at the track deliver the performance originally expected from them.
Simply fitting an upgrade to the car during free practice represents only half of the work — and even less on a Sprint weekend. Much of McLaren’s Dutch Grand Prix will revolve around precisely this delicate balance: understanding a dynamic behaviour that has inevitably changed and then identifying the ideal set-up required to release the package’s true potential.
The challenge is particularly relevant at Zandvoort, where McLaren already arrives with high expectations after its recent progress. The team has also prepared an unusual rear-wing concept for Zandvoort, adding another potential variable to its technical programme.
McLaren remains cautious with MCL40 development
The team led by Andrea Stella adopted a relatively cautious approach during the first half of the season. The Italian engineer has himself stressed how important it is to study an upgrade properly before committing to running it on the car.
That philosophy also explains why McLaren’s so-called “Macarena” rear wing has not yet been used in a race. The concept has already attracted attention as part of the team’s wider development work, but McLaren has resisted introducing it before gathering enough information.
It remains to be seen whether the wing will appear today during the Dutch Grand Prix’s only hour of free practice. With limited track time available, McLaren must decide not only whether each new component works as intended, but also whether the engineers can understand its effect quickly enough to find the correct set-up and extract its full potential from the MCL40.
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