His point Andy is that the ITAC has already answered these questions when they decided to class cars using real numbers. I asked the same question in the previous thread and I don't think ever got an answer. The ITAC would've had to answer 1-5 of your questions in order to class cars with real numbers, so what we're the answers?
The ITAC has set a precedent by classing cars using real numbers and they had better be ready to accept the consequences of doing so. You can't just do a one-time re-evaluation using real numbers for some cars and then say you're never going to do it again. You can't classify some new cars using real numbers because there's data on similar cars, but use the standard 25% on other cars because there's no data. In order to be fair to the cars classed using real data you need an on-going process to re-evaluate cars.
I would say you re-evaluate a car every X years starting X years after the car is classed. 3 years seems like a good number to me. We have a ton of already classed cars, so you spilt them up into thirds and start a rolling evaluation of each third. That's a lot of cars, but the ITAC already has info on most of them, right? All that has to be done is look at the existing info and see if there is any new info.
Race results are a starting point for "evidence". We don't like to use race results as performance indicators, but this is exactly how most of the cars for which real numbers were used were singled out. Dyno sheets are obviously a good source of info. Seems like you'd have to have a dyno sheet in order to know the real world numbers, no? Of course, now that people know the ITAC will use real numbers to classify cars people probably won't be so open anymore. It'd be an interesting exercise to rent a dyno for, say the ARRC, and then require all the IT cars to do some runs (right after qualy). I'm sure there'd be lots of bitching and moaning, but the results would be interesting.
The size of change required for the change to be implemented should be tied to a percentage of the cars classed weight, not some static change like 100 lbs. If the weighting based on the real world data results in a change of X% from the car's current weight then the weight gets updated. 100 lbs is 4% and 50 lbs 2% for a 2500 lb car.
As for proving negatives, I don't think the ITAC does anything about that now so how would that change? Has a car ever been classed using less than 25%? If your car can't make the 25% then maybe you should find another car.
David
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