Two years later, with backing from the German electrical giant AEG, the Swiss team battles Jaguar for the World Sportscar title.
In the Le Mans 24 Hours the team scored a 1–2 victory[5] with "the new Silver Arrows"[6] driven by Jochen Mass/Manuel Reuter/Stanley Dickens, with Mauro Baldi/Kenny Acheson/Gianfranco Brancatelli finishing in second place.
In 1990, Schlesser and Baldi shares the Drivers' title while Mass drives alternately with the three Mercedes Juniors: Michael Schumacher,[7] Karl Wendlinger and Heinz-Harald Frentzen.
In 1993, Welti launched the Porsche Supercup and himself led the negotiations with F1 Boss Bernie Ecclestone as it was to take place as an international one-make cup and support series in Formula One.
He was particularly instrumental in establishing a new and more efficient structural team organisation[10] and building up an especially tight relationship with its Malaysian sponsor Petronas as well as with its engine manufacturer Ferrari as of 1997.
From 2000, Welti was responsible as chief executive officer for setting up the V8STAR touring car series in Germany, a championship for tubular frame vehicles with silhouettes of well-known manufacturers such as Jaguar, Volkswagen, Opel, Ford, Lexus, Audi and BMW with uniform V8 engines under the hood and renowned pilots at the steering wheel.
The team also supported other Swiss drivers such as Marcel Fässler, Sébastian Buemi, Alexandre Imperatori, Tom Dillmann, Rahel Frey and Natacha Gachnang.
[14] He travels to important races of the WEC, IMSA, Formula E, DTM as well as WRX and is on site at endurance classics such as Nürburgring, Spa, Le Mans, Sebring and Daytona.
After winning the world championship title in the A1GP season 2007/2008, A1 Team Switzerland receives in December 2008 the Auto Sport Award for special services to Swiss motorsport.