Just did the 24 minutes of Le Mans in the Nissan DeltaWing and enjoyed it so much Idecided to take it out for a spin on The Ring 
  
6:21:91 is the fastest on a 3-lap run (there's defo 10 more second out there) 
  
So the challenge would be Nordschleife in a DeltaWing + any setup at all;  FI, suspension, downforce, racing soft rubber, TCS, ABS, DP, DVDA, you name it  
  
Might want to soften up suspension and watch the rear wheels on the kerbs