The two companies know each other well, as Audi has been a regular customer for the Hinwil wind tunnel, notably for its LMP1 project.
The Alfa Romeo sponsorship deal runs to the end of 2023, and Sauber has confirmed that it will continue to use Ferrari power for the following two seasons before Audi enters under the new rules.
These stipulate greater electrical power, the use of synthetic fuel and dispense with the MGU-H unit, which recovers power from the turbocharger.
Development of the 2026 power unit is already underway at Audi’s Racing department. More than 120 people are working on the combustion engine, electric motor, battery and control systems.
Work to expand the facility is expected to be complete in 2023, and the first test of the new power unit is scheduled for 2025, before it is raced for the first time in the following season.
“We are delighted to have gained such an experienced and competent partner for our ambitious F1 project,” said Audi board member Oliver Hoffman, who has been tasked with overseeing the F1 project.
“We already know the Sauber Group with its state-of-the-art facility and experienced team from previous collaborations, and are convinced that together we will form a strong team.”
Sauber team principal Fred Vasseur called the deal a “key step” for the organisation.
“The partnership between Audi and Sauber Motorsport is a key step for our team as we continue to make progress towards the front of the grid,” he said.
“To become Audi’s official works team is not only an honour and a great responsibility: it’s the best option for the future, and we are fully confident we can help Audi achieve the objectives they have set for their journey in F1.”
Meanwhile Rausing noted: “Audi is the best strategic partner for the Sauber Group. It is clear that we share values and a vision, and we look forward to achieving our common goals in a strong and successful partnership.”