Hahne participated in five
Formula One World Championship Grands Prix, two of those at the wheel of
Formula Two cars, and one non-Championship Formula One race. Hahne was successful in
touring car racing, including the
European Touring Car Championship. In 1966, he raced a
BMW New Class 2000TI. In the six-hour "
Großer Preis der Tourenwagen" on 3 July 1966, an
Alfa Romeo GTA had lowered the
Nürburgring touring car race lap record to 10:08.9. A month later, in a support race for the
1966 German Grand Prix, Hahne was the first to lap the Nürburgring in under 10 minutes in a touring car, in 9:58.5. On the old and very long Nürburgring, Formula Two cars occasionally had their own race alongside the Formula One cars in the same events to fill the field, which provided other drivers like
Kurt Ahrens Jr.,
Gerhard Mitter and
Dieter Quester the opportunity to enter the
German Grand Prix. As the Formula Two section was counted separately, the drivers could not score World Championship points. Hahne participated in the
1966 and
1969 German Grands Prix in the special Formula Two sections of those events, but withdrew before the start of the 1969 event due to the fatal accident suffered by his team-mate Gerhard Mitter. For his true Formula One debut at the
1967 German Grand Prix, Hahne drove a Formula Two Lola chassis fitted with a 2-litre 16 valve BMW engine, thus qualifying the drive for Formula One. The BMW factory were allowed to run this to give some national encouragement. He retired on lap 7 with suspension failure. The following year he finished 10th in the same car. Hahne got himself a
March 701 for 1970, but could not qualify for the
1970 German Grand Prix which was held at the
Hockenheimring that year. Hahne claimed that chassis and engine were among the worst of the many March and Cosworth delivered that year.
Ronnie Peterson showed later at
Silverstone that this very car could reach adequate times, and Hahne retired from racing. ==Racing record==