Not trying to squish your bubble, honestly though, if a site has a half decent search capability. THIS ONE DOES, Ide rather see no subdivision. If a person wants an answere, and its sliding off the page too fast, stick with the question, bump it once or twice. Having to hit 15 differnt sub areas etc.... Most people know about more than one subject as very very very few of us race/run/drive dyno's. So even if we are more engine oriented than other areas, we have had to fab, figure out, upgrade etc most other areas of a car.
Our response may not be the best for the OP, but a response usually begets additional reponses.
Not a bad question Les, but it could become like a lot of sub directories at the corral... people quit looking because there are so few posts/responses that the sub directory area dies and people use the lounge or other areas to get thier information.