After initial successes in karting Thiim 1978 in the automobile racing. Formula Ford, he quickly rose in the Formula Super Vee and Formula 3. After the title of the German Formula 3 championship in 1984 he was not the advance in the higher classes such as Formula Formula 3000 or Formula 1 succeeded
Thiim therefore in touring car racing. In 1986 he won the German Touring Car Championship at the wheel of a Rover Vitesse. At this time the DTM presented mainly the field of private tuner represents the major factory teams of Mercedes, BMW, Opel, Alfa Romeo, which many associate with the DTM, were mostly not active at this time in the DTM. In the following years, the DTM, however, developed rapidly into a pure plant Championship. Kurt Thiim remained active during this development as a driver and belonged from 1988 to 1997 to the driver line-up of Mercedes.
After the end of the DTM / ITC 1997, Thiim first in the Super Tourenwagen Cup, where it was an Opel Vectra. He finished the season in 18th place. After that, he spent one year in the German Touring Car Challenge for Brinkmann Motorsport. This Thiim finished a championship races on the podium, while his teammate Thomas Winkelhock decided the championship. Also in 1998 drove Thiim a BMW 320i, but he moved to Schirmer Motorsport, where he was unable to repeat the results of the previous year. He competed in the V8 -Star and took - in part as a works driver - in his native Denmark at different championships.
To date, Thiim starts regularly in the BFGoodrich Endurance Championship on the Nürburgring. In 2007 he sang for Nissan Europe with a Nissan 350Z in the 24- hour race at the Nürburgring. The Nissan was built in a joint project by RJN and the magazine Auto Zeitung / Powercar. His colleagues were in the 24 -hour race, Tim Schrick, Holger Eckhardt and Nicole Lüttecke. 2007 Kurt Thiim was again represented internationally in the race. With the team Markland Racing Kurt Thiim started in a C6 Corvette in the GT2 class of the Le Mans Series. However, the Le Mans Series season was with the newly developed Corvette with little success. On the side constantly changing drivers, he finished two of five championship races outside the points. He also drove a BMW 320si E90 occasionally the team Poulsen Motorsport in the Danish Touring Car Championship and supervised his son Nicki. This is also a racing driver and was launched in 2007 in the Seat Leon Supercopa Cup in Germany and in the BFGoodrich Endurance Championship. Currently Thiim drives in the Porsche Sports Cup Endurance along with Lars core for the team birdsong Motorsport.
In addition to his racing activities Thiim was as host of different motor sports programs in use. He supported 1997 and 1998, the German sports television in the transfer of the German Kart Championship. In addition, he hosted the 2005 24-hour race at Le Mans for the Danish television.