I mean the type that blow directly on the rotors, not the stock vents that "kinda" blow in that general direction

 

Thought about it. I guess it matters what type of pads you are running and if they work better on rotors that are cooler than if they are slightly warmed up.

 

I'm running AKEBONO pads, but I do NOT have the R1 brakes, so if I'm running it hard, there is a lot of heat.

4000 lbs of repeated hard braking needs a little cooling help.

 

thought about lighter rotors also? Would help braking tremendously

 

Just installed new EBC replacement rotors on both cars.

 

Not a good idea.

less mass == less fade resistance

Raybestos has an article on this if you are interested.

 

2 piece rotors do slightly reduce your fade resistance by offering less thermal mass, but they are superior in every other measure by reducing unsprung AND rotational mass (the very best kind of weight reduction!) and by transferring FAR less heat into your hubs and consequently your bearings, which greatly reduces stress on the wheel bearings, a known weakness in the X308. Unfortunately, NO ONE makes a 2 piece rotor for the ATE XJR brakes to my knowledge. DBA makes a 5000 series 2 piece rotor for the Brembos however, and in the 14" size, you won't have to worry about the reduction in fade resistance.

I've been contemplating fabbing up some real cooling ducts for my car as well. They made a MASSIVE difference on my 06 Mustang GT out on track days. It went from the brakes being completely faded to mush in 3 laps to it being able to go 10 laps before strong fade set in.

 

If you ever do, please post. I'm sure I'm not the only one who would pay for some

 

Hi Spec makes them and will fabricate a custom bell for two front rotors. 417 b. pounds for a set that weight 9lbs less on each rotor.

 

There is an article on the autospeed.com site about brake ducts and tire spoilers. If you combine the two by putting the inlet just in front of the tire spoiler you get the benefits of a high pressure inlet placement and better fuel economy.