Lots of good things being said. I just want to make a few points.
No way. IT2 excluded RWD. You exclude 3 of the most popular cars in ITA today, the 240SX, the Miata and the CRX. THAT is why I didn't buy into it. Just because the misclassed 4cyl S cars went to ITA means nothing. And I still submit a hard-and-fast formula can't work. We all know it isn't what is being done now.
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I don't know why some people still cling to the initial concept of IT2, when it wasn't that long after Kirk first proposed the idea, that some of the limitations (no RWD) went away. I agree w/ Kirk, ITA today is pretty much what IT2 was operationalized to. If you look at all the cars in the ITCS as a continuum, the band known as "ITA" was shifted towards a higher performance level. I don't know if the band was widened or narrowed, but it was definately shifted.
Also, I don't think any of the proponents of a formulaic approach to classification ever thought a 'hard and fast' formula was the answer (or that it would even work). I know I didn't. What it was about, was having an objective model that treated all cars the same. And, in the event of an anomoly, you could recognize it.
I am not a proponent of 'full-blown' DC's as a policy decision from the SCCA. I am for using them sparingly, when it makes sense for tweeners - similar to the application of PCA's.[/b]
The problem I have w/ this approach, is that unlike PCAs, this has the potential to be largely subjective (and while I don't want to speak for him, I think this gets to the heart of Kirk's issue). Unless you develop the policy to include something to the effect of "Cars that are w/in the upper or lower xx% of their class performance envelope shall also be classed in the next higher/lower class, at the process weight for that class", it's just too subjective, and you create a situation where people will lobby for their particular car or want a legitimate justification as to why their car isn't treated the same as others.
One of the best things to come out of PCAs and the new IT classification model, was that it became a much more objective process. It lowered the ability of someone in a position of authority (ITAC, CRB, etc.) to favorably influence a given car or cars. THAT is one of the best things to happen to IT in years. Going to some kind of subjective DC model diminishes and undoes a lot of the good that PCAs and the new classification model created.
While I understand that some people view being able to run the same car in multiple run groups as a good thing (gets more people on the track, generates more revenue for the Region, etc.), I'm not really in favor of it. The SM/SSM situation in NER and now WDCR is a good example. Dick mentioned that one of the main drivers in splitting the run groups between SM and SSM, was because they were 'breaking out', and that once the groups were split, more and more people took advantage of the DC option. I can see this easily extending to other DC cars. Maybe it won't happen as fast as SM/SSM (which is a bit of an anomoly w/in the Club anyway), but I can certainly see it going the same way. What happens when you have a 'tweener' car, that now has DC, and all of a sudden, a lot more of those cars come out to play? I'm not picking on the 1st gen RX7, but it has become the poster child for tweeners. Let's say it gets DC in ITA and ITB (let's not confuse things any more w/ IT7 and Spec7). You've now added more cars to the ITB group. If ITA and ITB run together, you now have the same car (albeit at different weights and w/ different wheels) in the same group yet different classes. As a driver, you'll have to be very aware of every car on the grid, to know if you're racing w/ them in your class or not. If they're not in the same group, now you have the situation Dick described earlier, more and more of the DC cars will start to take advantage of another slot to run in, on the same weekend. What happens when you get so many of those DC cars, that you start to 'break out' of your group size? Or what happens when it becomes apparent to the drivers, that they may be better off running in the lower class? In that case, you've
de facto re-classified the car.
Give the ITS cars going to ITR a year of DC, but don't extend it beyond that, and don't make it a category-wide policy. Look back on some of the recent re-classifications. Cars that have been moved down have had little (and in some cases no) weight added to them. If things are that close, you can make the case for quite a few cars getting DC.