“Clear as day” – Steve Nielsen warns against late rule changes as Mercedes engine row erupts. Nielsen challenges rivals, insists FIA rules on Mercedes engine are unambiguous.

The 2026 Formula 1 season has barely begun with the first pre-season tests in Bahrain, and already the first controversy has emerged. Mercedes is under scrutiny for allegedly designing its new power units around a perceived technical advantage under the new regulations. The Brackley team’s engine compression ratio issue has sparked a heated debate in the paddock, quickly moving into the political arena, with rival engine manufacturers Ferrari, Audi, Honda, and Red Bull accusing Mercedes of finding a way to increase the compression ratio beyond the 16:1 limit.

Standing firmly with Mercedes is Steve Nielsen, the managing director of Alpine, a Mercedes-powered team. Nielsen insists that the regulations are “clear as day” and warns about the dangers of creating a precedent by changing rules just weeks before the season begins.

Nielsen backs Mercedes amid widespread criticism

Mercedes has faced coordinated scrutiny from Ferrari, Audi, Honda, and Red Bull, who have jointly proposed changes to the compression ratio testing procedures. The four teams demand that engines be checked under operational “hot” conditions to ensure that a unit compliant at ambient conditions does not exceed the limits when reaching normal operating temperatures. If acting together, the four manufacturers could potentially secure a majority to modify the regulations, but any change would still require approval from the FIA and FOM. So far, the governing bodies have refrained from taking a position, stating only that they aim to resolve the issue before the first race in Australia.

It is here that Steve Nielsen steps in: “I suppose they have the right to protest,” says the Alpine managing director, who has extensive experience with both the FIA and FOM. “The crucial point for me is how we are approaching this. If we are saying that a set of regulations written clearly can be contested in this way, then what else is off-limits? Everything is up for debate. People invest enormous amounts of time and money—especially money—in good faith. And if suddenly everything could be challenged… then I think we’re entering a completely new world we’ve never experienced before.”

Admittedly, as the general manager of a Mercedes-powered team, it is easier for Nielsen to side with the supplier, but he defends his position: “One could say I’m biased because we have a Mercedes engine in our car, but do we really want a sport where things written clearly can be questioned just because someone wants to? It’s up to the FIA to answer that.” Nielsen’s point is clear: he highlights the risk of establishing a precedent where explicit regulations can be challenged mere weeks before the season commences.

Technical perspective: regulations are explicit

Beyond the political debate, there is a technical aspect. Whenever a new set of regulations comes into effect, teams push the boundaries in the details, which can make the difference over a 24-race championship. Exploring grey areas to extract advantages is common. In this case, however, Nielsen is confident: the regulations are explicit, leaving no room for misinterpretation. “Some teams took one approach, others chose another. My personal opinion is that I’m not worried because I think the regulations on compression ratios are clear as day. Other teams are attempting to introduce alternative interpretations for reasons only they understand. But we have full confidence in Mercedes. They built a power unit in good faith under very clear regulations, and we are satisfied with that. We trust that the governing body will do the right thing.”

Third day of Bahrain testing: insights from the track

During the Bahrain test, Nielsen also focused on the on-track performance. With the season still weeks away, the pecking order remains unclear, and it will take time to determine which teams have best interpreted the new rules. “If you had asked me after Barcelona, I would have said Mercedes is the fastest in the group. If you asked me Wednesday, I would have said Red Bull. If you asked Thursday, I would have said Ferrari. So perhaps tonight the answer is different. We are following our program, and the longer runs are the ones where you really learn, and Ferrari performed well.”

One of the new challenges of the season is the updated power units, where thermal and electrical energy will now contribute almost equally. Drivers face the challenge of optimizing the electric recharge phase to extract maximum performance. “What is true in Bahrain won’t necessarily be true in Melbourne. We need extensive pre-planning for strategy on every track, something we’ve never had to do before. It’s very complex. We all have simulators or access to them, and we knew this would happen, but there’s nothing better than testing it in reality.”

Nielsen defends Alpine driver Franco Colapinto

Finally, Nielsen spoke in defense of his driver Franco Colapinto, who has faced criticism. “I think Franco is a talent, and perhaps he is developing more gradually, evolving a bit slower than others. But we saw him perform well in certain races last year, especially compared to Pierre Gasly, who unfortunately was our only benchmark in some races, given that we were at the back of the grid.”

The political tension surrounding the 2026 power units suggests that the battle for the championship has already begun in the meeting rooms of the FIA long before the cars hit the grid in Melbourne. While Steve Nielsen warns against the dangers of moving the goalposts so late in the game, the united front of Ferrari, Red Bull, Audi, and Honda indicates that the technical advantage Mercedes might have found is significant enough to warrant a full-scale lobbying war.