Sainz explains 'biggest' struggle in adapting to Williams F1 car

F1

Carlos Sainz has pinpointed the area he is most getting to grips with in his new Williams F1 car

Carlos Sainz during practice for the Japanese GP

Carlos Sainz during practice for the Japanese GP

Grand Prix Photo

Carlos Sainz has been very open about the time it will take him to fully adapt to his Williams F1 car after five years at Ferrari, but the Spaniard says the Mercedes engine has been the biggest hurdle to overcome so far.

Sainz has joined the Grove team for the 2025 season after losing his Ferrari seat to Lewis Hamilton, and it is the first time in his career that the four-time grand prix winner has used a Mercedes power unit.

The Spanish driver has so far been unable to match the pace of team-mate Alexander Albon and has managed just one point as a result of Ferrari’s disqualification from the Chinese Grand Prix.

Sainz retired from the season-opening Australian GP after a crash due to suffering what he labelled as a “big torque kick” from the Mercedes engine when shifting up gears – and he says the process of adapting to the engine has been the biggest challenge for him.

“It’s the biggest change, and changing teams, that I’ve had to adapt,” said Sainz on Thursday ahead of the Bahrain GP. “One is obviously a higher dynamics and suspension you go through – everything feels completely different but when they change you the engine that’s when you really feel some big differences, and I do feel very big differences compared to Ferrari.

“There’s also things also in the way the team operates with upshifts, downshifts, patterns and things they do to make the power unit work that, as you could see in Australia, it caught me out.

Carlos Sainz, Williams, at the Australian GP

Sainz has so far scored just one point in 2025

Grand Prix Photo

“But at the same time, you need to go through that experience almost to understand that this happens only in the Mercedes-Benz PU and not in a Ferrari. And it’s interesting because it’s quite a big change and it’s incredible how different two power units can be, but how close in performance they can be at the same time.”

Expanding on the difficulties in adapting to his new car, Sainz concedes that the muscle memory he has carried from Ferrari is still playing a role.

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“Obviously a Ferrari had certain car balance, a certain direction that we followed after three or four years of developing that car that required you to brake in a certain manner, turn in a certain manner, release the brake in a certain place, which you fall into a trap of obviously three years of muscle memory of doing everything that way,” he added.

“And when you jump into a different car and especially under pressure, you try and find the last two tenths of the car, you fall into your muscle memory because that’s the muscle memory that you have from three years.

“It’s not that you need to unlearn them because those traits are actually making me very quick also in other type of corners, but you need to remember in a certain type of corner to not do it.

“That’s why it’s almost impossible to ask anyone to be quick on the first three races with a car when you’re only putting in the first sets of soft tyres and zero kilos of fuel for the first time in those first three races, on a completely different track, completely different conditions, completely different tarmacs, and you’re having to relearn a lot of these things.”

Despite his problems so far in 2025, Sainz said “I’m not in a bad place.”

Alexander Albon Williams 1 2025 Australian GP

Albon has led the way so far for Williams in 2025

“The speed has been there in Australia and Suzuka. In China, I had a bit of an off weekend through many different reasons. But to be honest, in Australia and Suzuka, I think I was pretty quick, especially given that I’m still new to the car.

“To manage to be close or in the same tenth as Alex all the way through qualy, I think it’s a good point to start the season. I just need to make sure now we start doing less mistakes when it comes to executing the weekend and keep improving my speed because obviously I believe the speed is still, we can improve it a little bit, but we are not as far as it seems.

“I feel like we just need to put a full weekend together and it will come.”