TX3 brake upgrade?

[CHRIZB]

At a recent tuning day at the Collie motorplex i have realized that my brakes are quite pox:( . I was wondering if anyone knew any good brake upgrades for a KF TX3 4wd turbo? Im thinking allong the line of DBA slotted and dirlled and some decent pads. Or possably some larger discs and calapers of a car that will be a relativly easy and reasonable (cost) conversion. Any help would be much appreciated:)


Thanks CHRIZB:D

[dattoman1000]

I have seen one with RX7 series 4 4spot on it. Though I have no idea what disc they used.
If your a regular collie sprint runner I'd suggest not using crossdrilled discs........if you get them too hot they can get stress cracks between the holes.......go with slotted only.

[Turbo4WD]

Speaking to a few people who have done the RX7 4pot conversion they say its quite involved as the mointing poits are much wider apart... new brackets ect needed + engineer plate.

I saw some crowd "brake boys" offering a brake upgrade for MX5 1.8 - since these have similar brakes to tx3 they might be able to be used?

[dbasteve]

How about some slotted rotors, top quality pads (Ferodo), and good tyres. It works for most street cars.

If your having serious pad fade or warping rotors with this simple setup then invest in a bigger brake upgrade.

[smee]

In the same vane, well the TX-3 and the BG Mazda are a generation apart, I have a 91 GTX Familia rally car.
It currently has standard front brakes and these are not the best at pulling up from high speed constantly. They can get a bit spongy at the end of a medium length stage.

I have heard about using Series 5 RX-7 calipers, but am not sure on the disc specification. From the pictures I have seen the hub has 5301 cast into it. It may have others but I cannot make them out. Yes the mounting points are out slghtly, but is only for the bottom mount hole that you have to make an extended mount for.

I have also heard of using V6 323 discs and callipers as they are the same dimensions as the BG 323 GTR.

Any suggestions as to which way to go.
I do not want to change the stud pattern as I have to many 15 inch rims with the 4 x 100 set up to go changing.....

[dbasteve]

We just finished a run of Group N Evo 6 (Pedders) discs for 15"s but I didn't think of making undrilled ones. Bugger!
You may be able to drill a 4 x 100 stud pattern in them. (DBA 4428) 276mm x 24mm.

Your discs are becoming unstable because they are over heating and distorting from internal stress.

If you want to get away from these problems you need to look at EVO's, WRX, or Skyline rotors basically because they are developed for high performance applications and can handle higher temps and stress for longer periods of time.

Also the Brembo radial mount Lotus caliper (4 pot) is an affordable option worth considering.

[smee]

I have recently received my Homologation papers for the BG8 Mazda's. It contains the following information about discs and calipers.
Does this ring any bells with you steve..Some maybe AP but others are genuine Mazda
These specs are from the GTX papers. There is no part number for the Brake disc Bell.
Disc Front and / or Rear
Grooved Right / Left:
CP3047 - 66 / 67
Exterior Diameter 304mm
CP2261 - 768 / 769
Exterior Diameter 295mm
CP2261 - 572 / 573
Exterior Diameter 304mm
Grooved Right / Left:
CP2261 - 708 / 709
Exterior Diameter 276mm
CP2261 - 698 / 699
Exterior Diameter 276mm


Brake Caliper Front and / or Rear
Calipers identical except for internal machining

Number of Cylinders per wheel 4 4
Cylinder Bore: 36.1mm 34.0mm
Right ZR01-33-980 ZR01-26-980
Left ZR01-33-990 ZR01-26-990

Number of Cylinders per wheel 4 4
Cylinder Bore: 2 x 38.1mm 2 x 41.3mm 31.75mm

Right CP3345-1054 CP3556-254
Left CP3345-1154 CP3556-354

These specs are from the GT-R papers. There is no part number for the Brake disc Bell. Some of the Disc numbers are the same as above, so I have not listed them.

Disc Front and / or Rear
Grooved Right / Left:
CP3047 - 178 / 179
Exterior Diameter 315mm
Grooved Right / Left:
CP3047 - 252 / 253
Exterior Diameter 330mm

Brake Caliper Front and / or Rear
Calipers identical except for internal machining
Number of Cylinders per wheel 4 4
Cylinder Bore: 2 x 38.1mm 2 x 41.3mm 31.75mm

Right CP3481-12U4N CP3556-254
Left CP3481-13U4N CP3556-354
Number of Cylinders per wheel 4
Cylinder Bore: 2 x 44.45mm
2 x 38.1mm
Right CP3720-46
Left CP3720-57

[dbasteve]

All these "CP" numbers are AP Racing discs.

http://www.apracing.com/car/brakedisc/dataselect.asp

Click on the correct diameter and some of these part numbers pop up.

[dattoman1000]

As your in Canberra and the AP distributor is also in Canberra you can also call him for specs and prices if you need to. Bear in mind that he's away for the remainder of the week at GP so best try Monday.

Competition Friction
Nicholas Bates (Neils brother)
02 6226 8877

[smee]

I have bought a second hand set of RX7 series 4 calipers and discs.
I will now get the upright modified to accept the calipers.
Modification looks pretty much straight forward.
Cut off the mount tabs that fit the original calipers slightly. Machine these flat and drill the mounting holes. There is plenty of meat on the upright, and as it is closer in, the forces excerted should be catered for. I have an engineer doing the work (not me with an angle grinder)
Discs will now have to be found.
Steve what are the dimensions of those Subaru and Lancer rally discs. They would need to be 4 stud to fit the mazda's 4x100 setup. Can those already drilled for 5 stud be drilled also for the 4 stud setup.

[dbasteve]

Originally posted by smee
I have bought a second hand set of RX7 series 4 calipers and discs.
I will now get the upright modified to accept the calipers.
Modification looks pretty much straight forward.
Cut off the mount tabs that fit the original calipers slightly. Machine these flat and drill the mounting holes. There is plenty of meat on the upright, and as it is closer in, the forces excerted should be catered for. I have an engineer doing the work (not me with an angle grinder)
Discs will now have to be found.
Steve what are the dimensions of those Subaru and Lancer rally discs. They would need to be 4 stud to fit the mazda's 4x100 setup. Can those already drilled for 5 stud be drilled also for the 4 stud setup.

WRX = 295mm x 25mm x 50mm offset ( 5 x 100)
Grp N EVO = 276mm x 24mm x 39mm offset (5 x 114.3)

The WRX would be easier to redrill as you could use a common hole from the original 5 stud pattern. We have some undrilled Aluminium hats for the two piece WRX disc.
The other option is to order undrilled discs but this may take a while untill the next production run.

[smee]

OK, in regards to aluminium hats how hard is it to get the offset down.
.
WRX = 295mm x 25mm x 50mm offset ( 5 x 100)
Grp N EVO = 276mm x 24mm x 39mm offset (5 x 114.3)

Currently the offset for the GTX is 45.5. If I go to the WRX hats then the discs will move closer to the uprights and may be too large. Am I able to put a spacer in there somewhere to change the off set size down. ie move the base of the hat away from the upright. Will the disc from the WRX be too large to go under 15 inch wheels, or can I get a similar sized disc to the EVO.

If I go to the EVO discs, then these are of similar size to the RX7 discs and only slightly less in the offset than the GTX, so it will move it away from the upright. Will this cause any great problem.
It may allow me more leway in mounting the calipers to the upright.

Sorry for all the questions