Simple (almost) all Mazda Front Big Brake Upgrade

[300zxrb26dett]

BTW, did you see the protege on CP with the 5 lug swap? It used 88-92 MX6 spindles/hubs all the way around. Only thing he has the whole engine/trans in the car too, so i dont know if any of the MX6 hub options can be used with our axles.

[wytbishop]

The GD spindles on the BG or EC chassis would require some "corrections" (front ones for sure) as the position of the lower boss for the ball joint is set back enough to affect caster significantly. I have no idea how he got around that. Although the 5 lug swap has never been part of my goal I do plan to check the fit of the BJ 5 lug hubs when I get to the point of modelling the front spindles. I am fairly certain that they will work.

[WhiteFinish]

I checked the Mini Cooper S brake disk today.

It didn't fit with the 323f v6 spindle and Mazda 6 caliper. Nor it did with the Millenia caliper.

[projectB10]

I checked the Mini Cooper S brake disk today.

It didn't fit with the 323f v6 spindle and Mazda 6 caliper. Nor it did with the Millenia caliper.

what exactly was the problem?

Are you able to test using the subaru 2xpots and the GD caliper bracket combo?

[WhiteFinish]

I'll post the picture up soon.

The holes on the knuckle can't be alligned with the caliper due to a too big rotor.

The rotor pushes to caliper more out and thus the space between knuckle and caliper won't fit.


I can't test with the subaru calipers since they can't be found in europe. (or very hard !)

[wytbishop]

Yes I always knew that an adapter would be required for the caliper on the larger Mini Cooper rotor. The point was to find a larger diameter rotor that has the same hat and thickness as stock.

My concern with the mini rotor was always how the loose it would be on the MX-3 hub because the studs on a Mini are larger than ours and the hub opening is larger as well so I worried that the rotor wouldn't center well.

Pics of the rotor and how it sits on the studs would be great.

[WhiteFinish]

This is the rear side where you can see it doesn't fit



I'll make a picture of the front later.

[WhiteFinish]

The pics

[wytbishop]

this concerns me. I would need to do some testing with the rotor on the car to see how it reacts. I think that it's possible that the rotor could shift under braking.

Problem is that you need to make a bracket to attach the caliper to the spindle in order to see how it works. So that being the case I say go for the really big 294mm unit from the John Cooper Works car.

[Josh]

I would measure the outside of the hub, and the inside of the disk and get a hubcentric ring machined, and call it a day It would not be able to shift if you did. Have you looked into the VW Carrado sport rotors? Miata guys have been using them forever for Big brake upgrades.

[wytbishop]

they look like they would work but I was really hoping to make the 294mm(11.6") mini cooper rotors work. I had thought of the hubcentric rings too. I just wish it wasn't necessary.

[Josh]

Well the studs are close enough in size you may be able to find a pipe that is the same diameter of the stud holes in the rotor and make small shims to line it up that way. would be cheaper and probably do it yourself. Would be a lot closer that way.

[Calg_93GS]

not sure if you have seen this on PT, but there might be something on there "big brake" upgrade setup that you can work into your research

http://forums.probetalk.com/showthread.php?t=1701255346

[wytbishop]

I have seen this thread. the problem with that particular idea is that you would have to convert to 5 lug to use the probe/mx6/626 spindles and I had set the criteria that whatever I came up with had to fit with stock 15" wheels.

If you have to buy wheels to upgrade your brakes the effective cost of the upgrade goes through the roof and defeats the purpose...at least by the criteria I had set for myself.

[Calg_93GS]

I have seen this thread. the problem with that particular idea is that you would have to convert to 5 lug to use the probe/mx6/626 spindles and I had set the criteria that whatever I came up with had to fit with stock 15" wheels.

If you have to buy wheels to upgrade your brakes the effective cost of the upgrade goes through the roof and defeats the purpose...at least by the criteria I had set for myself.

with the exception of the MS rims tho, if you are going to a big brake setup, the chances of keeping the stock 15's is fairly low, most would also be looking at going to 16 or 17 inch rims at that point would they not? and converting to a 5 lug does open up to a more rim options.

that aside, and sticking to your criteria, have you looked at the honda crv discs? when i was at part source, they showed me a mx3 and crv disc, both were 4 lug and the diameters all looked somewhat the same (tho that was just eyeballing it, would use a micrometer to verify) the only difference was the actual disc size, the crv was fairly larger, perhaps this also might be an avenue that could be explored?