The GT350R laughs at your brake duct solution
https://farm1.staticflickr.com/464/19713483740_082c856340_b.jpg
Are you experiencing brake fade at those temps? Not trying to dissuade you, just want to get the full picture. That and I’m still trying to convince you to go for full weight reduction first. You could get a good number of custom carbon fiber parts for $12k!
A lot of supercars weigh 3500 pounds. I want their brakes. I want to follow them deep into the (late) braking zone.
The shop I use is working with some vendor to template and fabricate brake ducting for the RS5. It should fit the S4.
http://images.tapatalk-cdn.com/15/09/16/ff9dd73558d7370666c99ca4578a59d3.jpg
Seems like they have revised their original design from a month ago.
A guy posted about it on AZ here: http://www.audizine.com/forum/showthread.php/664938-RS-5-setup-for-track-use
http://i.imgur.com/JCL4Na4.jpg
Yeah Terry custom made these for Andre. He’s going to fit another set for me. The gain is -250F at Thunderhill. That would take me to about 400F if true. The cost of the install would easily pay for itself in rotor longevity.
Looks nice
The Brembo RE10 track pads lasted 7 track days before they were shot. That’s $110 per track day. Steep, but effective. I reordered and bedded the new pads.
Yeah, I’m going through my Carbotech XP24 pretty fast too. But that’s also because the pads for my caliper are expensive…
7 track days are pretty good.
I’m using street pads (lol) and so far after 3 events, there is about 65% remaining.
I think about 6 track days is what I can get out of PFC1038. Which btw, work fine as long as they get some airflow to them.
RE: Airflow mods.
I will post more on this later, but I’m going to pick up the Macan airscoops (mount to the LCA and direct air to the rotor) and do the Psykotic mod of installing naca ducts into the under tray. Would go a long way in solving the brake heat issues of this car.
FWIW removing the inner splash shields reduced heat tons. Worth trying. Just keep an eye on your ball joints
I did carve a rectangular hole in the wheel well on the passenger side so allow air to flow through the old fog lamp opening. Not super high tech but it should help. I made it larger after this photo. On the driver’s side the liner is pretty well carved away from the heat exchanger.
Yeah that’s perfect and what you need to so. Even better–run a duct from there to the hole in your fender liner. I would do that too but the shape of the facelift fogs don’t work well for a round duct 
I’m told by my shop that I may only have one track weekend left on the Brembo 380x32 rotor. I’m hoping they are wrong and I have 3 weekends in them. I’ll have to put a measurement caliper on it and see the depth. If they’re right that’s only like 11 track days.
Does anyone know the performance difference and trade offs with Brembo Type 3 and Type 4 rotors? I never found an adequate description.
Put a micrometer on it and see what you are at. You are more aware than anyone else here that road course driving is a very expensive hobby. Good luck!
I can’t even find a reference to the type 4 rotors.
Sorry, I meant type III and type V.
"Brembo type V Face type: The Brembo type V face type is a motorsport developed face type with comparable initial response compared to a typical sprint disc while focusing on braking control, modulation and low wear of the consumable parts (pads/discs). The Brembo Racing type V face type is designed to offer lower pad and disc wear for certain long distance endurance races or heavy duty braking applications.
Brembo Type III (aggressive face type): motorsport developed face type with an emphasis on high initial response while maintaining a smooth pedal release."
http://images.tapatalk-cdn.com/15/12/26/51c092aab9bc40ea7b4a863e01308248.jpg
Well if your goal is longer lasting brake consumables then the bolded sentence for Type V should make up your mind.
I have always preferred slotted rotors like Type V anyways. They look cleaner.
I’ll see if they have applications for the B8 and report back. If the chassis is too heavy or something sometimes they don’t.
Even though my Brembo endurance pads are new (1.5 track days) I may need to order another set for bedding new discs, and swap the current pads back in later.
They also have a heavy duty, high thermal application on some platforms. What they do is cast the disc so it fills inward and closes the gap 10mm where it meets the hub hat. It’s about an extra 1.5 pounds, so 21.5 vs 23.