Since the real differentiation between a 'Seven' and a 'Regular' car is the power-to-weight ratio, wouldn't it make sense to have a weight classification, and then subcategories based on engine displacement?
All this talk of windshields, fenders, wings, tires, etc., really doesn't have too much bearing on performance between Sevens (Westfield, Caterham, Birkin, or Locost). Trying to define a 'stock' Seven sounds impossible, so why not classify them under weight, then power (or vice-versa)? Stipulate that all cars must run street tires, or under the assumption that the lightest cars are track-specific cars to begin with and allow slicks in their category?
The biggest obstacle, from my point of view, is getting any participants to force the SCCA to create a special class.
NASA already has a Se7ens Challenge, no?
And yes, I realize NASA racing is not autocross! http://www.usa7s.com/aspnetforum/images/emoticons/smile5.gif
tm
manik2006-11-10 15:03:13