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Today's new cars running in SS and T will be IT-eligible in 5 years. That is, as long as they don't have ABS, turbos, AWD, traction control, etc. And at that point in time, in 2011, I'll wager there will be not a single new car that doesn't have ABS. So in 10 years, 2016, when the 2011 models would otherwise be IT-eligible ... will they still have to disable their ABS system in order to allow the cars that are 20 years older than them (the ones that didn't come with ABS from the factory) to be relevant?
As I mentioned in e-mail a couple of weeks ago, there are more than a few modern cars for which disconnecting the wheel speed sensors causes tons of problems with their braking systems. On a modern Mazda3 with ABS, if you disable the wheel speed sensors, under threshold braking the pedal goes totally hard and you get no brakes. I know, we tried last year on one of our cars. The ABS system sucks (cheap car) but it's just not driveable when you disable it. There are similar problems in the Lexus IS300, which is one of the proposed ITR cars.
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what you have described is precisely the condition we have TODAY. it will be nothing new in 2016. in its you have 30 year old 240z's with drum rear brakes....and newer cars like acrua's and bmw's that have to be dumbed down to keep the older cars relevant. the issue here is at what point do we just accept that technology has moved on and stop trying to drag the older cars along as "competitive". obselesence is a tough thing to deal with.