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PostPosted: Mon Jul 09, 2007 9:52 pm 
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Junior WRC

Joined: Tue May 23, 2006 8:06 pm
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Location: Knoxville, TN USA
Car Model: None
Just got my calipers in. I am slowly going to be posting research and adding info about my evo 8 brembo BBK upgrade.

I had a set of rear st205 calipers, but I think I am going to sell them now. I think they would be easier to mount, but I am going to mos tlikely put the brembos all around. I need to sort out my engine bugs before going all the way with these brakes.

I am not even sure these things fit. I was blown away at how large these brakes were. Here is a shot of the caliper themselves. They dwarf the oem alltrac brakes.

Image

Here is my check list of things to research and sort out to build this system.

• Caliper brackets
(Will have to wait till I choose rotors.)
• Custom brake lines
(There is a shop in town that will make what I need)
• rotors
(I may still attempt the bolt pattern conversion project, which will determine my rotor choice. I may also get a custom 2-peice rotor, or use the sti rotors. I will use st205 rotors on the rear.)
• wheel clearance
(I might need a spacer, even though they are realy wide wheels)
• brake master cylinder
(I may adapt the one from the evo 8 or go aftermarket)
• Pads
(Plan on using Hawk HPS.)
• Brake Bias valve

Does anyone have a part number for the trd rear st205 rotors? I think I can get those at my dealer if I have a part number, which will save me shipping charges.

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
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http://www.noritoy.com


Last edited by cms-gt4 on Fri Oct 03, 2008 7:48 pm, edited 1 time in total.

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PostPosted: Mon Jul 09, 2007 11:17 pm 
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Location: NLD
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cms-gt4 wrote:
I am not even sure these things fit. I was blown away at how large these brakes were. Here is a shot of the caliper themselves. They dwarf the oem alltrac brakes.

Imagine my face when I opened the boxes @ AP Racing :lol:

Quote:
Does anyone have a part number for the trd rear st205 rotors? I think I can get those at my dealer if I have a part number, which will save me shipping charges.

42431-20280 is for OEM (non TRD) if that helps..

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Turbocelica.nl | ST185 CS restoration and full rebuild

If it ain't broken.. it soon will be


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PostPosted: Tue Jul 10, 2007 1:39 am 
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Junior WRC

Joined: Tue May 23, 2006 8:06 pm
Posts: 595
Location: Knoxville, TN USA
Car Model: None
Thanks. I just found out they will not import trd. So I will inquire on OEM, which is fine by me. The dealer says the number is bad, but some dealers systems have it and others do not.
I regret throwing away my old 205 rotors. I would not have used them, but they would have helped for measurements for the time being. I bought an entire rear end.

Here they are compared to my OEM 350z brembos. I love the brakes on my 350z, I am excited I will get something close on my gtfour.

Image

Here are the rear calipers compared to the st205 rears.

From a visual inspection, the bolt holes on the brembos and st205 calipers are very close. The back spacing may be different though. The dimensions are also close, the 205 calipers being slightly larger in areas. I will have to weight out if its worth adapting them, or making the color of the 205 calipers match and just use them instead. Its not like they are bad brakes. ;)

Image

Here is where it is going to go. It dwarfs the oem calipers by so much.

Image

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
Image
http://www.noritoy.com


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PostPosted: Tue Jul 10, 2007 3:54 am 
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Posts: 595
Location: Knoxville, TN USA
Car Model: None
st205 Master Cylinder bore: 24mm

Here are some caliper specs:
This is the range I am looking for from the evo 8.
Evo 8:
Front Brake Size 320.001 mm | 12.7 in. x 1.3 in.
Rear Brake Size 300.001 mm | 11.9 in. x .9 in.

Here are some disc options.
st205
Front Brake Size 315 mm x 32 mm
Rear Brake Size 315 mm x 15 mm
55mm center bore

Audi TT (front):
312mm x 25mm
(Might be too thin)

2004 Sti
Front: 12.7" diameter, 1.2" thick, Four-piston, fixed-position calipers.
Rear: 12.3" diameter, .8" thick, Two-piston, fixed-position calipers.

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
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http://www.noritoy.com


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PostPosted: Tue Jul 10, 2007 8:04 am 
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been working on a similar project... found that 330 x 34 was a good size for fitment..

lug mounts are never the easiest to mount..

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Black UK 96 205 shed with heater full on telemetry.

project six million dollar 185, faster, stronger, lighter than before.


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PostPosted: Tue Jul 10, 2007 3:22 pm 
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Junior WRC

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Location: Knoxville, TN USA
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If you beat me to finishing the project, I will gladly buy a set of caliper brackets, of course if the price is right? Are you doing just the fronts or both front and rear?

I would like to use two peice rotors all around. I think that would help with the rear disc width issue.

I found a company that makes a good sti 2-peice discs for ~325usd. I am trying to get them to make a custom centerbore so the discs would be hubcentric then my front disc issues would be resolved.

Baer makes a 13" rotor for the st185. I am not sure of the disc width though. Its 500usd for the discs, so I am going to look for a more ecconomical route.

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
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http://www.noritoy.com


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PostPosted: Tue Jul 10, 2007 5:44 pm 
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Location: Knoxville, TN USA
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If anyone knows of a ready made 185 rotor hat, this could be made into a simpler project.

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
Image
http://www.noritoy.com


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PostPosted: Tue Jul 10, 2007 7:55 pm 
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Club Staff
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Joined: Thu Jul 14, 2005 12:44 pm
Posts: 4067
Location: drinking devil fuel
Car Model: ST205
What is the centrbore of the Scooby disks?

If it's a lot larger then you should be able to get it shimmed or if it's a lot bigger it might even be insertable

I don't think I've ever seen bell/rotors but obviously they do exist lol

I don't know how AP racing work but thry obvoiusly have disk specs and might be able to help


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PostPosted: Tue Jul 10, 2007 8:05 pm 
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Junior WRC

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Location: Knoxville, TN USA
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sti center bore is 56mm and the st185 is 54.1.
I had concidered having a ring made that will fit over the 185 hub to make it work. I can get aftermarket sti fronts discs for a fair price.

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
Image
http://www.noritoy.com


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PostPosted: Tue Jul 10, 2007 9:48 pm 
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Joined: Thu Jul 14, 2005 12:44 pm
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Location: drinking devil fuel
Car Model: ST205
Hmm, that's a little close for comfort

To be honest if you go for a bell and rotor setup I'd think about getting the bell bored out to say 60 and then pressing a new centre with the required 54.1. It's a bit of work but with bells you should never have to do it again :)

One thing I do know which might help
If you put 205 rotors on a 185 hub they foul the lower balljoint on the hub. Not by much apparently but they foul none the less. So ideally you'd be looking for a disk setup with slightly less rearwards offset than a 205 one


Oh PS
Your front disks are on the wrong sides ;)

PPS
MAC?


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PostPosted: Wed Jul 11, 2007 9:35 am 
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TT disc makes for a great rear upgrade on the 185 , 312mm x 25mm vented with 4 pots, using aux handbrake caliper, or in my case a hydraulic handbrake..
Image

alcon racing rotors straight from a seat class B car, same pdc as four.
Image

the front bell is bigger than the stock 185 disc..

bless it with some calipers..
Image


205 disc on a 185 causes major problems, if no air gap of at least 15mm between disc & lower ball joint it will fail..

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Black UK 96 205 shed with heater full on telemetry.

project six million dollar 185, faster, stronger, lighter than before.


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PostPosted: Wed Jul 11, 2007 2:13 pm 
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Location: Knoxville, TN USA
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Does the rear drum need to be modified or is the TT disc a direct replacement? And by TT you mean auidi?

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
Image
http://www.noritoy.com


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PostPosted: Wed Jul 11, 2007 3:35 pm 
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cms-gt4 wrote:
Does the rear drum need to be modified or is the TT disc a direct replacement? And by TT you mean auidi?


TT disc = vag = volkswagon audi group. not a direct fitment, only requires a small amount of machining, as for the handbrake drum, :lol: what drum brake, thats in the bin..have no intention of using the factory handbrake system, its nothing but a parking brake, not suitable for handbrake turns which is a must.

with the complete backing plate re-designed for stone guard & air ducting will allow for maximum cooling


handbrake caliper can be found on some of the rear disc braked vag automobiles

you can use either cable or / and hydraulic for secondary system

the uk mot reg states that the parking brake must operate on a separate system than that of the foot brake.

i found running a heavily sprung 185, that the weight transfer to front was reduced, being that its a split torque transfer means that a reasonable amount of rear braking can be achieved without causing instability to the rear end, furthermore a weak rear brake setup only causes increased work load on the front braking system, so a balanced setup mean that all 4 corner are at optimal.


205 rear disc upgrade for a 165/185 is a good option, but being solid does reduce its cooling collection times.

_________________
Black UK 96 205 shed with heater full on telemetry.

project six million dollar 185, faster, stronger, lighter than before.


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PostPosted: Wed Jul 11, 2007 4:09 pm 
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Junior WRC

Joined: Tue May 23, 2006 8:06 pm
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Location: Knoxville, TN USA
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If I were to go w/o the oem parking brake, would i not be better off to just get a 2-peice rotor for the rear in the psecs I want?

The car will see normal driving, and with the tire size I have, I am not sure if I can get the car fast enough on most the of the types of turns I take to ever get a good handbrake turn.

255/40 all around, makes the car a bit grippy.

Also, I do not think I can adapt a st205 mster cylinder as a direct bolt up to my lhd 185 system.
So I may try and modify an evo master cylinder to fit my 185 setup.

I am really thinking about keeping the 205 rears just because it would be so simple.

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Coldiron (Cold - Iron)
1992 Celica Gt4 RC Conv. St205 swap
Image
http://www.noritoy.com


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PostPosted: Wed Jul 11, 2007 11:23 pm 
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Junior WRC

Joined: Sun Nov 27, 2005 8:43 pm
Posts: 998
Location: NLD
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datajon wrote:
205 rear disc upgrade for a 165/185 is a good option, but being solid does reduce its cooling collection times.

Ehh? The ST205 rear discs are vented.. :)

Image

Image

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René - Carlos Sainz 2433•5000
Turbocelica.nl | ST185 CS restoration and full rebuild

If it ain't broken.. it soon will be


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