Central RC the Japan Serpent distributor organised an endurance race of 150 minutes. Teams of between 2 and 4 drivers. Only closed type bodies (like Porsche GT1, Mc Laren, BMW M3 or Opel Calibra). The OS RG8 engines was obligatory for this class, so same power for all.
Check the below link:
http://www.centralrc.co.jp/crp/racereport/94.html