While I'm not an engineer on thermodynamics or brake systems, I think it'd be a waste of time using the stock 1.8 non-sport rotors with 4 pot calipers..

The extra diameter rotor gives you more braking surface area for the pads to grab, and more surface area to dissipate heat away from the rotors. While maintaining the stock size rotor and adding more grabbing pressure might benefit a little, I don't think it'd improve non-lock brake ability any, if at all for the benefit.

Thats just based on what little I know about brake system design. I myself am interested in the biggest rotor I can squeeze on the car. :)

I'm with you, but I can tell you that it would still increase braking performance. I used to have stock rotors with the KVR 4 piston calipers on my old car and it stopped great!

Well, someone was all over the rear calipers on the rx7 at the junkyard, so I couldn't pull them to see if they fit on the miata. It's got a LSD though, so I might have to go back and pull that.

using the bracket they made for the rears, it iwll bolt on. thats all the info it gave me.

while the extra diameter helps dramatically....ever put a heavier PP on a stock 200mm clutch and was able to not have it slip in boost, where before it did? same idea.

I missed some of this. What adapters? What rotors? Which calipers? I can go grab some.

its on that japanese website that was posted on the second page. ill read a little more on it, then ill let you know the scoop on it.

EDIT: i love being able to read japanese hahaha.

http://speed.garage-tsr.com/brake3.htm

theres your rear setup fellas.

No fitment problems, and its a direct bolt on.



EDIT #2:

Even MORE INFORMATION. http://speed.garage-tsr.com/habu.htm
this is a post showing that the FC centric hubs that go on the spindles are also DIRECT SWAP. these are better because they do sit further than the miata hubs. Might help with clearance of the FC calipers, but they seem to be using the 4 bolt pattern, not the 5 bolt which the 4 pots came on.

apparently, you can buy them brand new form the dealer using that part # listed, and it costs generally 60 bucks each.

More for thought: Isnt the hub pattern on the RX-7 114.3 x 4? someone correct me. if this is true, you will have a variety of jay dee em tyte wheels for you at your disposal.

We started last night... Major clearance issues using the Corrado rotor and RX7 Front Caliper. Won't even fit with my 16" Volk TE-37s.

Going to the wreckers in a few minutes to see if we can find a solution.

Really? The 4 Pot's fit under the 15's that the FC has. Anyone tried FC rears to see if they bolt up yet? If I have time I might go down to the local junkyard and take some measurements.

The step on an RX7 rotor is much deeper than the G60. We have an 88 TurboII here with my miata to compare.

If you take a look at the pictures from the Japan kit they use a big ass wheel spacer to make this work. I certainly don't want a 1cm spacer on my car.

We might be able to make brackets so you can use the 11" rotor with stock Miata calipers. It actually looks pretty good when I chucked it together for 30 seconds.

Good thing is that it would be very inexpensive and great when people need to install new brakes, but also a performance upgrade.

Let me know if anyone is interested in this? I personally am, but 1 person is not going to get this in production.

Thanks

Hmm, what about the RX7 calipers squeezed onto the stock 10" rotors? That's was my plan originally. Well, the stock calipers are a tight squeeze on the 10's for my factory 14's to fit. I'm sure they wouldn't fit with the RX7 calipers. However they might fit with 15's.

Also, how close did your bracket put the caliper to the center of the rotor? Could you get it closer to give you the needed clearance, or is it already as close as possible? The stock calipers on my 99 are CLOSE to hitting the rotor, very close.

+1

Tried.. Not going to happen... The owner of ETD owns a 1988 Aniversary Turbo RX7. Take a look at the dish of the rotor on an Rx7 and you will see why they work on that car. You have 2 cm extra dish on the rx7 rotor. If we use the Rx7 rotor it will hit the ball joint, nevermind the bolt pattern is wrong.

No play with the caliper on the rotor. Atleast with the brand new pads.

The guys in Japan used mad spacers!

We should be able to work with a stock caliper, but even then you might have to grind the back of the brake pads 1mm on each side to compensate for the thicker rotor. Miata = 20mm G60 = 22mm.

I think they were talking about stock 10" miata rotors with the RX7 caliper, or possibly with the sport rotors.

Edit: looks like I need to work on reading comprehension

Weird. Define not going to happen. Well, you don't have to, I'll check it out this summer. It's weird because there's too much talk of people doing this to dismiss it as not gonna happen. I dunno, I have not test fitted anything yet. I guess the wheel curves in and hits the caliper, and that's the problem. Not that the wheel is no big enough, but that it curves in and clips the calipers. As you say, a wheel spacer would solve that, or offset rotors.

Basically we tried all kinds of different ways to make it work, and even shaved off the Mazda Logo and bump on one to create extra clearance. Unless someone can find a different offset 4 x 100 11" rotor it won't work.

We tried with both an 11" G60 and 10" Miata. Major clearance issues and that is with my 16" wheel.

People have done this before, with a big ass spacer, or like 50+ offset wheels (Doubt that). The caliper hits all of the spoke on my wheel. These calipers are friggen MASSIVE!

Yea, I understand what your saying. The problem is the calipers hitting the spokes of the wheel. I have a 18x60 lathe, so I could chuck up my wheels and machine a bit of the spokes out of the way for clearance if a little was all that's needed. Could also chuck up the calipers and turn a bit off of them with the proper offset in the chuck so that the outside of the calipers had a XX radius that matched the wheel. That's not something the average guy would do though, but it might make it possible anyway.

You might be able to get it to work with major machining to your wheel.
Do you have the RX7 calipers yet? Take a look at them compared to stock. You will see what I mean.

It was quite evident as soon as we started to play. :( I have access to a Mill and a lathe, but the purpose is to make a kit for the masses, not just for me.

Yes, I have a pair or RX7 calipers, but they are not here with me. They are a lot wider than stock though. I know what you mean though, they are huge compared to our stock ones. Perhaps a slightly more offset rotor combined with machine a little off the stock wheels would give me enough clearance. Still, I'd likely need 15's for even that to work.