Hans becomes Drivers' Champion in the German Touring Car Championship in an Audi V8 Quattro, winning at Avus, Wunstorf, Norisring and Hockenheim. He also competes in the Sports Car World Championship with Team Joest in a Porsche 962C. He finishes fourth in the 24 Hours of Le Mans, France.

In the U.S. IMSA GTO Championship he takes fourth place driving an Audi 90 Quattro and clinches five wins with Walter Röhrl and Hurley Haywood. In the 24 Hours of Le Mans in France he takes third place driving a Porsche 962 with Derek Bell.

Hans wins the 12-hour race at Sebring and takes second place in the 24 Hours of Le Mans in France with Klaus Ludwig in a Porsche 962. He finishes third in the U.S. Trans-Am Championship driving an Audi Quattro, earning the ‘Rookie of the Year’ title with seven wins.

Driving a Porsche 962, Hans wins the 24 Hours of Le Mans in France with Derek Bell, and becomes Drivers' Champion in the German ADAC Super Cup. He also takes second place in the 24-hour race in Daytona with Bob Akin.

He narrowly misses out on the World Endurance Championship, finishing just one point behind team-mate Derek Bell. He wins both the Le Mans 24-hour race in France with Derek Bell and Al Holbert, and the 12-hour race at Sebring with Jo Gartner and Bob Akin in a Porsche 962. 

"My first Le Mans win was very spectacular, but unfortunately it was overshadowed by a sad event.  It was during this race that Jo Gartner, my Austrian colleague with whom I won in Sebring, was killed.”

This year Hans moves to Porsche as a works driver. He becomes Drivers' Champion in the World Endurance Championship with Derek Bell in a Porsche 962, winning at Hockenheim, Mosport Canada and Brands Hatch. He takes second place in the German Sports Car Championship driving with Brun Motorsport in a Porsche 962. With wins at the Nürburgring, Wunstorf, Zeltweg and Erding, he earns the title ‘German Driver of the Year’.

In the European Touring Car Championship with Team Schnitzer, Hans wins the 500-kilometre race of Mugello in a BMW 635 CSi. In the Sports Prototype World Championship he wins the Imola 1000-kilometre race in a Porsche 956 C (Team Walter Brun) with Stefan Bellof.

Hans takes second in the German Racing Trophy with Team Schnitzer in a BMW M1

This year Hans finishes fourth in the European Touring Car Championship. In a Team Schnitzer BMW 635 CSi he wins the Macau Grand Prix. With a Team Schnitzer BMW M1 he takes third in the German Racing Trophy with wins at Zolder, Nürburgring, Hockenheim, and the Norisring. This year also sees him take part in the inaugural season of the Sports Prototype World Championship, with Walter Brun in a Sauber SHS C6 Ford.

With Team Schnitzer Hans takes third in the German Touring Car Championship driving a 1000 bhp BMW M1. He wins the 1000 kilometre race at the Nürburgring with Nelson Piquet in a BMW M1 (the first BMW victory in the World Endurance Championship). He also wins the GT class at the Daytona 24-hour race, together with Walter Brun and Rudi Walch (BMW M1).