Author Topic: Dual Caliper Setup (AE86)  (Read 28471 times)

SidewaysEightSix

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Dual Caliper Setup (AE86)
« on: December 27, 2012, 07:18:35 PM »
Considering going dual caliper rear on the track car since I will actually use it.  Problem is, no one makes brackets for the AE86(at least not in production)

So, I can spend some cash and find someone to CNC me some, or I was thinking of making my own using two sets of stock brackets.  Cut them down the middle and weld them up solid back to back.

What do you guys think?  Does anyone offer new stock replacement brackets?



Obviously I'll need another set of rear calipers and a reservoir running to my ebrake
« Last Edit: December 27, 2012, 07:20:32 PM by SidewaysEightSix »
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Hackeduphachi

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Re: Dual Caliper Setup (AE86)
« Reply #1 on: December 27, 2012, 08:36:02 PM »
I am considering doing this on my hachi. I was just gonna have a bracket made that uses gts calipers. Your idea sounds cool you should try it. Problem is finding two sets of good gts brackets.

twincharger

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Re: Dual Caliper Setup (AE86)
« Reply #2 on: December 27, 2012, 10:20:13 PM »
Draw what you need, I can do some light machining...

I might be able to help.

SidewaysEightSix

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Re: Dual Caliper Setup (AE86)
« Reply #3 on: December 27, 2012, 10:27:54 PM »
Basically a stock GTS caliper bracket except the little tab would need to be mirrored and on the opposite side.  It is a pretty flat piece

I'll draw one up tonight.
"I'm fat and he's Asian.  Crazy food is bound to come up in conversation."
      "wait, am I the Asian?!"
"yeah bro.  Yeah, I think so."
      "I'm white!"
"visually, yes.  But so is Takumi Fujiwara."

Yes....  You are an expert

SidewaysEightSix

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Re: Dual Caliper Setup (AE86)
« Reply #4 on: December 29, 2012, 03:28:46 PM »
It's going to look a bit odd.  the original idea is to have the ebrake caliper set opposite the brake caliper.  problem is there is a rear strut in the way over there.  The solution I came up with is to move the brake calipers location from 3 oclock (relative to wheel on passenger side.  9 oclock on drivers) to more like 1 oclock and then put the second caliper on the same side at around 5 oclock.


I don't see how that may adjust braking performance based on the design of disk brakes.  But could it? 

The piece is relatively flat.  just the bolt holes for the caliper are offset to match the rotor.  could be an easy piece to fab

I have to get ready for work.  I'll go into more detail later.
« Last Edit: December 29, 2012, 03:30:20 PM by SidewaysEightSix »
"I'm fat and he's Asian.  Crazy food is bound to come up in conversation."
      "wait, am I the Asian?!"
"yeah bro.  Yeah, I think so."
      "I'm white!"
"visually, yes.  But so is Takumi Fujiwara."

Yes....  You are an expert

SidewaysEightSix

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Re: Dual Caliper Setup (AE86)
« Reply #5 on: December 29, 2012, 09:03:43 PM »
so the stock bracket looks like this.


hard to see but I made a template for what would basically be a stock replacement without a dust shield.


came up with this



again hard to tell but the housing is pointed upwards, each "indent" represents a caliper.

the stock bracket is 1/8" thick and the caliper bolt holes are offset 1/8"  The dust shield looks like 1/32"

Now I think I can loose the 1/32" dust shield and have everything mount up ok. But i think i want to make the brackets 5/32" thick till it offsets, then 1/8" for the tabs.
« Last Edit: December 29, 2012, 09:11:38 PM by SidewaysEightSix »
"I'm fat and he's Asian.  Crazy food is bound to come up in conversation."
      "wait, am I the Asian?!"
"yeah bro.  Yeah, I think so."
      "I'm white!"
"visually, yes.  But so is Takumi Fujiwara."

Yes....  You are an expert

Dubsky

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Re: Dual Caliper Setup (AE86)
« Reply #6 on: December 29, 2012, 09:07:18 PM »
You can offset the calipers 90* from each other instead of 180 if the calipers fit. And you could always make the brackets for larger diameter brake discs as long as there is room but best not to over engineer if you don't have to. It wouldn't exactly increase the braking efficency since you'd be stuck with the same brake pad contact patch and its a light 86 and you are drifting so who cares..

SidewaysEightSix

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Re: Dual Caliper Setup (AE86)
« Reply #7 on: December 29, 2012, 09:21:12 PM »
they aren't quite 90, or 180.  lol it's I'm guessing around 120*

Bigger disks are an option, but i don't think it will help me much with the fitment problem. Then I have to either find a different rotor to run, or custom order a pair which I'd rather not do.  If i can keep using stock rotors that would be neat.  And possibly help sell these if I need to do a bulk run or something

I doubt it will help braking performance, I'm just asking if position could somehow effect it in a negative way.  I don't really see how.
"I'm fat and he's Asian.  Crazy food is bound to come up in conversation."
      "wait, am I the Asian?!"
"yeah bro.  Yeah, I think so."
      "I'm white!"
"visually, yes.  But so is Takumi Fujiwara."

Yes....  You are an expert

twincharger

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Re: Dual Caliper Setup (AE86)
« Reply #8 on: December 29, 2012, 09:57:11 PM »
If all you need is a bolt-on flat plate 1/8 in thick shaped like this...



I can probably do that.

No welding onto the axle housing, no 3-D offset to line up with the brake disk ?

Can the dust shield be separated from the bracket?  If so, you could re-use it.

I don't have any 1/8 in metal, I have some 1/10, but that's kinda thin.

If I could borrow that old bracket for a few days after I pick up some metal, I'll see what I can do.

SidewaysEightSix

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Re: Dual Caliper Setup (AE86)
« Reply #9 on: December 29, 2012, 11:02:05 PM »
No, it needs some 3D offset.  The tabs need to offset 1/8" closer to the rotor to fit.  The bracket is also 1/8" thick.  The stock brackets offset is equall to the thickness of the bracket. I could possibly just make it in two pieces that weld together.  Just set the tabs flat on top and weld it in

The dust shield won't work.  But who cares.  It's a race car.
« Last Edit: December 29, 2012, 11:04:28 PM by SidewaysEightSix »
"I'm fat and he's Asian.  Crazy food is bound to come up in conversation."
      "wait, am I the Asian?!"
"yeah bro.  Yeah, I think so."
      "I'm white!"
"visually, yes.  But so is Takumi Fujiwara."

Yes....  You are an expert

Dubsky

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Re: Dual Caliper Setup (AE86)
« Reply #10 on: December 30, 2012, 09:31:13 AM »
You posted right before I posted, and yeah we just agreed on everything.
BUT, this was what I meant by 90 degrees



One directly on the side and one directly on top.

Thats for s14 single pots with s14 brembo rotors on a Hilux dif. This was what I was thinking of in my text.

Hackeduphachi

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Re: Dual Caliper Setup (AE86)
« Reply #11 on: December 30, 2012, 11:55:16 AM »
Baller 8)

SidewaysEightSix

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Re: Dual Caliper Setup (AE86)
« Reply #12 on: December 30, 2012, 04:48:58 PM »
The answer is pretty simple.  Two pieces, both 1/8" thick.  Piece 2 welds to the back of piece 1 giving me the necessary 1/8" offset.
« Last Edit: December 30, 2012, 05:14:06 PM by SidewaysEightSix »
"I'm fat and he's Asian.  Crazy food is bound to come up in conversation."
      "wait, am I the Asian?!"
"yeah bro.  Yeah, I think so."
      "I'm white!"
"visually, yes.  But so is Takumi Fujiwara."

Yes....  You are an expert

SDSK

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Re: Dual Caliper Setup (AE86)
« Reply #13 on: December 31, 2012, 12:38:23 PM »
Dragon bracket for the win! This sounds like an awsome project. I see what you mean about placement of the calipers but I don't think that will matter, rather I would be more concerned about the extra heat your going to be building with x2 the pad surface to rotor. Obliously slotted and or drilled is a must....

SidewaysEightSix

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Re: Dual Caliper Setup (AE86)
« Reply #14 on: December 31, 2012, 02:37:34 PM »
^ Im not worried about heat too much.  The second set of calipers are e-brake only, so it's not like they will have as much continuous friction like the foot brake would. 

Plus it's drifting, in a hachi.  I should only use the brakes once or twice a run, same with the e-brake.

I may fab up some brake ducting as a precaution tho.


I'm having a hard time finding someone to draw up a CAD design.  So I might just get these done with a water jet.

« Last Edit: December 31, 2012, 08:13:23 PM by SidewaysEightSix »
"I'm fat and he's Asian.  Crazy food is bound to come up in conversation."
      "wait, am I the Asian?!"
"yeah bro.  Yeah, I think so."
      "I'm white!"
"visually, yes.  But so is Takumi Fujiwara."

Yes....  You are an expert