Castrol-Haugg-Cup

The Rundstrecken Challenge Nürburgring (RCN) (circuit racing challenge Nürburgring) or BMW Driving Experience Challenge, previously known as Castrol-HAUGG-Cup (CHC), is a motorsport event series. Being run since the early 1960s mainly on the Nürburgring, it is regarded as Germany's oldest touring car racing series. Unlike in regular races for position, the event that is similar to rallying on a closed race circuit, with time challenge laps and co-drivers on board.

For many years, the series was sponsored by Castrol and HAUGG (a company owned by a race driver, providing car parts like radiators). For 2007, the sponsorship arrangements were changed, putting less emphasis on these two companies.

The event is officially styled by the FIA/DMSB as a Leistungsprüfung 200km (LP200, performance test over 200 km). This means that the RCN is not a race for positions among cars that are started at once from a grid (like VLN endurance races), but a time trial, with cars being started one by one, about 5 seconds apart. This reduces the risks of collisions, as there is no benefit for a racer to defend his or her position.

Most RCN events are held on the Nürburgring, mainly on the 20.832 km long Nordschleife version, on Saturday afternoon following a Gleichmäßigkeitsprüfung (GLP) run by the same organizing club. One or two additional events are held on the Grand Prix track, or on the combined tracks as used in VLN or at the 24h. Since 2003, some events were held on the Circuit de Spa-Francorchamps. As season highlight in front of thousands of spectators, the RCN usually runs on the Thursday before a 24 Hours Nürburgring race, which is a holiday, either Ascension Day or Corpus Christi (feast). The track versions used during that event include various sections of the Grand Prix track. In 2005, the CHC was run on 4 different track versions, three of them at the Nürburgring.

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