Budget cap limited how far Mercedes could overhaul 2024 car – Allison

Mercedes technical director James Allison says the team has achieved the goals it set for its W15, which is the product of a new design philosophy.

However he admitted some aspects of the car’s design have not been radically changed due to the limitations imposed on the team by the cost cap.

Allison returned to the role of technical director in April last year after Mercedes were disappointed by the performance of the W14, produced under Mike Elliott. Allison has masterminded an overhaul of the team’s approach to the technical regulations which were introduced in 2022, since when the team has won just one grand prix.

Mercedes committed to extensive changes to the architecture of its next car soon after Allison took over.

“Bigger layout changes are not freed up by no longer having the hassle of racing, you make those big layout changes prior to the summer,” Allison explains. “So, when we talk about a layout change, you’re generally talking about where the engine sits in the chassis, what geometry of rear suspension you’re going to have on the gearbox and what changes you are going to make to the part that contains the driver.

“Those are all three things that are hypothetically do-able in the middle of a year but come at such huge opportunity cost that you would never contemplate it. But nevertheless, you need to commit to them in the preceding summer.

“The off-season is about proving to yourself on your internal rigs and simulators that those pieces are what you hope they might be; that it looks like it will deliver on your hopes.”

Advert | Become a RaceFans supporter and go ad-free

Although the team won’t get their first impression of how successful they have been until the W15 completes its first scheduled run at Silverstone today, Allison is confident about the direction they have taken.

“I feel like we have delivered on all the things we said we wanted to do,” he said. “Some aspects are unbounded and therefore you can never be fully satisfied. We will not know until we run the car truly.

“But I think we can say that we feel like we have worked well. Formula 1 is a relative game. Whether we’ve worked well enough to be competitive, only time will tell. We do not know what everyone else has done.”

Mercedes last won the constructors’ championship in 2021, the first year F1 introduced its budget cap. Allison admitted the restrictions on spending meant they had to accept some compromises to the scope of their chances to the W15.

“A new chassis and a gearbox were standard for every year, pre-cost cap. And there’ll be several other teams who have done both things in a single year. But the cost cap does force you to pick and choose your battles, and there’s no doubt that having a new outer casing as well as at the same time as having a new chassis are two big projects that are going to take a chunk of our available firepower.

“That is what we have done this year. It does mean that in other parts of the car we have not tried to reinvent the wheel. But it has allowed us to undertake a couple of big projects without breaking the bank and we believe that this is a good and important use of our efforts.”

Advert | Become a RaceFans supporter and go ad-free

One notable area the team has left unchanged compared to the previous season is its suspension concept, retaining a push-rod arrangement at the front. However Mercedes plans to introduce a series of aerodynamic upgrades over the course of the year to unlock more performance from the W15.

“Most of the lap time you can put on a car comes from aerodynamics during a season, but precisely what we find and in what area is still unknown,” said Allison. “The aerodynamic department is, at this stage of the year, planning to put a good amount of effort in to front wings, rear wings, floor, brake drums, brake ducts, bodywork, all of which could produce things that might arrive for the European season.

“Several of those programmes will not come to fruition, but that is just the nature of experimentation. But if you try hard enough over a wide enough range of experiments, then enough of them will come good in that time scale and there should be a decent package to put on the car by the time we return to Europe.”

Drivers Lewis Hamilton and George Russell found it difficult to consistently get the best out of last year’s car due to its unstable rear end. That has been a key area of focus for the team to solve over the winter, but Allison said improvements have been made in other areas as well.

“A big focus has been on improving the previous car’s unpredictable rear axle, which the drivers often referred to as spiteful. We have worked on that to try and create a car that is reassuring to the drivers. At the beginning of a corner when you’re hard on the brakes and turning in, the rear needs to feel rock solid. And then as you get towards the apex, the car needs to feel progressively more nimble, and eager, to turn. We have been trying to build that into the car.

“We’ve also worked hard to create a less draggy car, and to add performance in the corners. There’s also been some housekeeping on areas in which we had room for improvement, including the DRS effect, and pit stop performance. We were always very good at delivering a pit stop in a repeatable time, which is the key thing for a pit stop. The repeatable time that we could do our pit stops in was still three to four tenths slower than the best teams, though. So hopefully we will have moved in the right direction there.”

Advert | Become a RaceFans supporter and go ad-free

Formula 1

• F1 CEO Domenicali wants more than six sprint races per year
• Hulkenberg named Audi’s first F1 driver for 2026
• Ricciardo needs to show “head-turning form” for 2025 chance – Horner
• F1 Commission defers decision on points change and approves new rear cameras
• Red Bull’s star designer Newey to leave team – reports

Browse all Formula 1 articles