every heard of them? something like powerslots stuff that uses stock calipers and bigger rotors?

 

Heard of them, seen them used, no idea where to purchase.

There was a guy recently that placed I think BMW 540 front rotors on... something like that. He used spacers in his FD calipers (car was FC) to fit around the big brakes.

 

You dont need a bigger rotor, you need better tires/brake pads, the stock GXL/TII brakes a plenty big enough to stop the car.

 

If you happen to be road racing (like the guy w/ the 540 rotors) having a larger rotor can help to dissapate heat and reduce brake fade.

But yea, for a street/drag/drift car, the stock setup is fine w/ the right pad/tire combo.

 

How did he use BMW rotors on an FD. Its a 5x120 bolt spacing, vs. 5x114.3 for the Mazda???

 

^^^ yea, you'd think that would be a problem wouldn't you...He elongated the bolt holes in the Bimmer rotors (and it was an FC btw, just used FD calipers)

 

that doesnt sound way to safe to me... but i'd imagine it work.

 

I have seen shops advertising in Japanese magazines like HyperRev and RX-7 Magazine for caliper adapters to put larger rotors on FCs and FDs- so they are out there.

 

Elongating the bolt holes isn't really a good idea. FD and FC 4 pot calipers are the same.

Stock brakes are all you are going to need. Ever look at most of the REAL FC race cars out there, stock calipers and rotors.

Spend the money on some SS lines, good brake fluid, and good pads.

 

SuperNow in Japan make spacer thigns so you can put larger discs on your FC.
Here's some images of them:

 

The OP wants larger rotor in the front...you're showing the back of the car.

 

It was an FC with FD calipers. He

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machined them to 5x114.3.

He later said that some Mercedes should be pretty much a direct bolt up.

Edit: He used the 540's because he has a 540 and could use them if they didn't work.

 

Might be something to consider if...
A) I fix everything else on my FC
B) Ever road race
C) Still experience brake fade after upgrading lines, pads, and stock size rotors

But thats what's great about FC guys, always thinking outside the box. (outside the expensive box anyway)

 

Cheers to that!

 

I don't understand the posts that dismiss upgrading the brakes. If he was asking for a shop that supplied a certain turbo he would probably get lots of responses; I think it must be because we are pretty ignorant on the brake upgrades here in the US because drag strips have plenty off run off :P

Sure I have gotten by with just rebuilt calipers, upgraded rotors, Porterfield pads, SS lines and DOT R tires, but I have just done Auto-X and Hillclimb so far. On a course I am sure my brakes would fade out fast.

Flipping through an old RX-7 Magazine I see that

Motor Garage Alex advertised a kit for r33 calipers and supra rotors for the FC/FD. The website doesn't seem to be working

www.rspantera.com had kits too, I think I saw one for R34 caliper on FC.

racing garage Prestage had a kit.

Probably have to get an adjustable brake bias valve as well when altering the brake system.

 

I believe Corksport sells those kits for the rear calipers.

 

Blue TII: You're the ignorant one. Every FC race car in the SCCA up to the GT level MUST use the stock setup, and they work just fine for ~200whp and 9" wide slicks on a 2500lb car. Dave from Mazdatrix reported that he goes many weekends on his EP race car before he has to even think about looking at the brakes. Ducting is important, as it'll help get the heat out of the brakes so you don't fade them.

They only become a problem if you've got a problem and something's not working as well as it should, you're not using the porper parts (ie street pads on the track) or if you're going crazy fast.

 

Keep in mind BlueTII is making about twice that 200hp you're speaking of and he's far from ignorant. I can imagine with 400hp you'd be moving a little faster down those straights than with 200hp and need a little more braking power. Ducting is very important but don't call anyone ignorant directly that you don't know.

 

And 400hp would qualify as "Crazy Fast"

 

I agree they work just fine because that is fairly close to the car the stock brakes were designed for; now when you double or triple the horsepower you may find you are pulling down from higher speeds entering the corners and it is harder on the brakes.

However, why don't they permit upgraded brakes on the FC if there is truly no advantage? I bet there would be an advantage to larger brakes even on a 200hp FC.

Street cars definitely have the advantage over race cars as we don't have to follow all those pesky rules but we are still allowed on the course - lucky!

Exactly! A turbo rotary on a road course is crazy fast.

 

I am ignorant on many subjects, but still willing to learn about subjects that interest me and that counts for a lot :P

 

It's the 9" wide slicks (not R's, slicks) part of that equation that makes the difference (they've got about a 10.4" wide carcass). They can haul the car down from speed better than almost anything else anyone's running (unless you're running >275 race tires in front). With your car on track with appropriate pads and ducting it's probably fine. You won't be generating the same amount of braking force, so the stop takes longer and the heat has more time to escape while it's being generated, meaning lower peak temperatures. Also these are guys racing, for most people at track days they're not going nearly as hard, so it's a lot easier on components so you might not find the brakes to be a problem.

They don't permit upgraded brakes on anything, it's not FC specific, that's just how it goes.

There's certainly a need for upgraded brakes with some car/driver combinations, but for the vast majority of people a properly working stock system is more than enough.