Originally Posted by
will13k7
no doubt. I don't see most people who hit the track that post on these forums adding air ducting. If there was an off-the-shelf air ducting kit, maybe that would change?
I hear a lot of folks say to avoid drilled brakes at the track, but Westwest888 has even cracked a slotted light-weight 2-piece design at the track, and at the rear where the temps are lower!
I have no doubt in my mind that if there was a high demand for a brake duct cooling kit for 8V chassis vehicles one would be available. Same as any other model. Problem is the amount of guys that actually heavily track their vehicles enough to utilize something like that is even smaller compared to the general enthusiast group which is already limited.
Not to mention guys that are big into tracking would likely just have something custom made if they needed it. I've seen a good amount of B5 S4 guys make their own dust shield replacements that have a port to attach ducting which can be routed to the front of the vehicle for more direct air flow to the rotors.
In all honesty you can crack just about any rotor if it gets hot enough. Brake rotors are like big heat sinks, and just like any heat sink it can only handle so much heat before it overheats without proper cooling. That's where you'll have cracking. Now there is a difference between stress fractures from heat and a rotor actually failing from cracks. Minimum wear thickness also has an effect. The closer you are to minimum wear thickness the greater the chances of the rotor failing if it already shows stress fractures from heat. So it's important to keep a close eye on that. Anytime stress fractures start to connect or reach the edge of the rotor you should consider replacement.
Jason
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