thehojster

Here's the deal. I've got an '87 GX, which has the 4lug hubs/rotors, I need to replace brakes all around as I'm somewhat restoring this car and the brakes are basically non-existant..

I don't wanna upgrade everything I'd need to to put 5lug stuff in there, so I was thinking I'd pick up some new rotors off ebay like these ones:
http://cgi.ebay.com/ebaymotors/86-88...spagenameZWDVW

And then buy some TII calipers for the front and rear, like this:
http://cgi.ebay.com/Mazda-RX7-RX-7-T...QQcmdZViewItem

Would those calipers work with the rotors I linked to?.. what would if not?

I basically just need to know what do I need to run the TII calipers w/ a 4lug setup, or if that's even possible.

Another thought I had, was how good are the standard single piston GX calipers?.. if I just had some good new rotors, and really nice pads, would that give me half decent stopping ability? or am I asking for trouble with that if my car's gonna be making a bit more power than stock..? like these bonez stage1 pads:
http://rx7.com/store/rx7/fcbrakes.html

I dont' know much about Rx7 brakes, so I'm sorry for the noob questions here.

thanks for any help on the matter

Mechanic

you can ALWAYS send the rotors out to get it machine press drilled... to 4 lug... 240 people do it ALLL the time, im suprised not much people here knows about this!!

Pat McGroin

People do know about it, it's just that I don't remember seeing anyone put 4 pots onto the 4 lug hubs. On ALL 5 lug hubs they bolt right on, no problems.

If anyone else knows, you might have to fab a bracket for the 4 lug hubs to accept the 4 pots.

Mechanic

now why would that be, logically the wheels have same if not similar offsets, so the wheel base is different by a few millimeters, centimeters, or inches? if not then it should be fine logically speaking.
hey no one else is answering because they probably just went to the junkers to pick up 5 lug hubs... so they got no answers..
lol the best thing to do is try it, its a little time and like 25-100 bucks depending on your machine shop price... (if you got hookups, know what i mean?) and you got a solid answer... look at the 4 lug rotors and look at the 5 lug rotors, aside from diameter is the hat the same size, if it is... your question is just answered, go to the machine shop/junkers.

oh uhm.. if anything the spindle should be your problem, not the hub... i doubt they would make a different size hub for 1 extra lug/stud.

since you say bolt on... the hub has nothing to really do with it... if anything ... the spindle lol


i honestly think due to the suspension being identical if not similar that the spindle is identical.. so they really would not make a hub a different size, that means more money, it cost less to drill one less hole and use one less bolt... so.

Pat McGroin

That's assuming if the hubs are the same, etc.. The main thing that is of my concern is if the s4 4 lug caliper location is the same as where the 5 lug calipers bolt on.

Since I don't have any s4 parts to compare I asked one of the guys I sold a 5 lug conversion to, if he could compare the hubs. Also, maybe looking at the part numbers for the hubs will tell if they're the same.

For the turbo II rear, you would have to switch over to everything turbo II, being that the halfshafts are thicker than NA's, then you would have to machine your driveshaft/ or t2 drive shaft to accept your motor/ or the t2 rear end depending on which driveshaft you go.

But to use an NA's rear vented disc setup you would need the whole hub assembly. Keep in mind most NA's came with solid rear discs. If you really want rear vented discs go the NA rear vented route.

But the performance gain on the rear vented discs is minimal and you'd be better off just getting better brake pads, better fluids, braided brake lines instead of spending money on the whole rear hub assembly.

Focus on the fronts since that is where most of your braking occurs.