I know this post is a bit old but I thought I would see if there is any update. I just got a set of FC calipers, miata 1.8 rotors, and corrado rotors. Once my car is done getting tuned at The Shop I plan on trying to get these to work also. From what I can see with my handy dandy calipers the corrado rotors have a shorter top hat 17.2mm then the miata 1.8's 25mm. With this said if you use the corrado rotors mounting the calipers should be easier but now you end up needing a bigger wheel spacer. Something like a 20mm spacer would be needed to use the corrado rotors. Also my corrado rotors are vented so im not sure how you came to find they are not vented.
http://sphotos.ak.fbcdn.net/hphotos-..._2579754_n.jpg

thought i would add this in too.
miata 1.8l 255mm rotor
http://bremboaftermarket.com/En/Car_...IDMaster=16217

VW corrado rotor 89-91 4lug
http://bremboaftermarket.com/En/Car_...IDMaster=22698

They are vented, but the vents open to the wheel side of the rotor, so all the air to go through the vanes has to first go through those little holes in the hat, rather than just having free access from the back of the rotor. Racing Brake has a version that's vented to the back.

Turns out its fairly easy to adapt these to the 323 GTX so thats what i'm going to do with my FC calipers.

http://www.clubprotege.com/forum/att...1&d=1235267661

Okay I see what your saying.

You have a 323gtx or are you going to use there rotors?

I have a 323 GTX and I think I will be using RX7 calipers with Galant VR4 rotors on it. The stock brakes are smaller than miata 1.6 brakes.

Nice and why in the world would mazda use smaller rotors on the gtx then the miata. That's strange in my book.


ADDED

Well if you don't mind I was thinking of posting what I find with these calipers and corrado rotors here seeing as you got this thread started.

Please do.

just saw the thread and was wondering if there were any updates. :)

Nope none yet its too cold out but once it warms up or im able to get my car in a heated garage. Once i do start i will post up so you guys can see if i was able to pull it off.

There is a local race car built by Specialty Engineering here in Vancouver that runs FC calipers on their turbo NA. I didn't take a look at the bracket when I saw the car, but they did shave the face of the caliper down quite a bit to allow for wheel clearance. I.E. it dosen't say Mazda on it any longer and you can see where it was shaved down.

The only problem I see with that mounting solution, is the lack of a "3 point" connection on the bottom. Under hard braking, it looks as though if you didn't wrench on the bolts hard enough it could move closer to the rotor and start to drag on the outer lip.

For rigidity purposes, a 3rd bolt needs to be added to triangulate the lower mount.