Akina's build

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The FTBR rotors are actually 1.11 inches thick. SN95 Cobra replacement rotors are typically 1.1 inches.

[AKINA FC]

Hmm interesting, thank you for the information. Ill have to call them to discuss the dimensions and or for a possible second option as this changes things. I was basing all my designs off the stock rotor dimensions, keeping the whole off the shelf stock parts going. All stock cobra R rotors are 1.25", from summit racing to carquest, as that is what i have used for years now, the fronts end up about the thickness their rotors start at when ready to toss. Might end up having to run wilwood rotors after all. 

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Hmm really?

The Centric blanks for Cobras were always 1.1 inches. Centric lists the width at 1.1 inches and the diameter at 12.99. I just went to Rock Auto for a sanity check.

The 350z rotors I'm running now are 12.75 x 1.18, so the Cobra rotor is about a wash.

[Supe]

324mm x 30mm from Revolution Brake.  I'm running Wilwood pedals with dual masters, 13/16 front and 7/8 rear (I think).

What are the dimensions on your rear rotors/thickness? Dual masters would be nice, got any pics?

I think they're the same thickness and diameter as the fronts.  I can check tomorrow. 

Not a very good picture but the clearest I could find.  Wilwood 6.25:1 top hung pedal assembly.  I cut and welded a few Speedway mounting brackets to mount the assembly from tabs on the dash bar, and then it uses some round tube and plate to bolt to the factory holes in the firewall for the necessary support.  Tilton reservoir pokes through the top of the dash where the idiot light assembly was. 

If I had to do it over again, I'd buy a floor mount assembly.  I was not impressed by the tolerances/overall quality of the Wilwood setup, and it was a BITCH to mount.  I even had to do some grinding just to get Wilwood's own master cylinders to mount in the assembly properly 

[AKINA FC]

Hmm really?

The Centric blanks for Cobras were always 1.1 inches. Centric lists the width at 1.1 inches and the diameter at 12.99. I just went to Rock Auto for a sanity check.

The 350z rotors I'm running now are 12.75 x 1.18, so the Cobra rotor is about a wash.

Now this is interesting, going back through websites and then comparing the rotors I have on hand - one car quest rotor and the other are the Baer rotors I have been using- sites show 1.10, the ones I have measure 1.20, both measure 13". This makes me feel better about my measurements but a little confused now. I'm gathering there is enough allowance for variation in thickness in the oe caliper design that this doesn't matter. I will have to talk to wilwood and FTB next week to get some insight. If that is the case I'll just stay the path I was on.

Yeah size wise it's about a wash but being able to have a cost effective two piece rotor would be nice.

[AKINA FC]

324mm x 30mm from Revolution Brake.  I'm running Wilwood pedals with dual masters, 13/16 front and 7/8 rear (I think).

What are the dimensions on your rear rotors/thickness? Dual masters would be nice, got any pics?

I think they're the same thickness and diameter as the fronts.  I can check tomorrow. 

Not a very good picture but the clearest I could find.  Wilwood 6.25:1 top hung pedal assembly.  I cut and welded a few Speedway mounting brackets to mount the assembly from tabs on the dash bar, and then it uses some round tube and plate to bolt to the factory holes in the firewall for the necessary support.  Tilton reservoir pokes through the top of the dash where the idiot light assembly was. 

If I had to do it over again, I'd buy a floor mount assembly.  I was not impressed by the tolerances/overall quality of the Wilwood setup, and it was a BITCH to mount.  I even had to do some grinding just to get Wilwood's own master cylinders to mount in the assembly properly 

Very nice. If we keep asking you enough questions we could put a build thread together for you eventually haha
Yeah if you could measure yours when you have a moment I would appreciate it.

[AKINA FC]

Had a little free time today and made my new catch can, fairly happy with how it turned out. Fits perfect and this time I added a AN bung in the bottom for a hose to attach to for draining without removing it from the vehicle.

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That looks killer Erik. Where does the smaller hose go? Valley cover?

[AKINA FC]

Thanks Ash. Yeah the third hose is for the valley cover. I use a -6 compression fitting on the valley cover tube, so -6 in the valley and -10 on the valve covers.

[AKINA FC]

Well back onto brakes - After doing more research over the past few days I think I have came up with a better package. Using a six piston front with 13" rotor - 1.62/1.12/1.12 pistons -  and the factory rear mustang caliper with 13" rotor - 1.496 piston- I create a better bias front to rear, it looks better and the major plus is I retain the park brake. Rear calipers are really cheap and readily available as well. Looking at schematics and pictures online it looks like I can at the least adapt the stock mazda park brake cable as the positioning of the brake actuator is pretty close to the mazda's. This caliper is the one Im planning for the front - http://www.wilwood.com/Calipers/CaliperProd.aspx?itemno=120-6584-FS -  Still planning on using FTB's rotors front and rear.
I ordered the mustang calipers and will have them this afternoon to see what is needed to make this work. If this looks like a go and wilwood says that the 1.10" thick rotor is compatible with the caliper I have chosen I will order all the parts next week and hopefully be building brakes that weekend.       If something looks off let me know or just thoughts in general about it.


Leg input in pounds: 60
    
Master cylinder diameter: 1.0625
    
Front line PSI (un boosted): 451.141
    
Front caliper pist dia 1: 1.62
    
Front caliper pist dia 2: 1.12
    
Front caliper pist dia 3: 1.12
    
Total front piston area *: 4.032
    
Front pad Cf: .54
    
Front rotor diameter: 13
    
Front pad radial hieght **: 2.43
    
Front Rotor Torque In.lbs.: 5190.737
    
Rear line PSI (un boosted): 451.141
    
Rear caliper pist dia 1: 1.496
    
Total rear piston area*: 1.758
    
Rear pad Cf:  .54
    
Rear rotor diameter: 13
    
Rear pad radial height: 2.03
    
Rear rotor torque In. lbs.: 2348.744
    
Percentage of front Bias:  0.680
    

[Supe]

Went and measured.  Rear rotors are same dimensions as the front, 324x30mm (12.76 x 1.18). 

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I think you are good.

The rear pads will only be .07" thicker than the FC pads. That is really the only downside (if you could call it that) of your proposed setup. If you are going to all of the work it would be nice to get a thicker rear pad, but with the parking brake provision, and ease of replacement, the Mustang caliper is a good compromise.

[AKINA FC]

Went and measured.  Rear rotors are same dimensions as the front, 324x30mm (12.76 x 1.18).

Thanks Supe.

[AKINA FC]

I think you are good.

The rear pads will only be .07" thicker than the FC pads. That is really the only downside (if you could call it that) of your proposed setup. If you are going to all of the work it would be nice to get a thicker rear pad, but with the parking brake provision, and ease of replacement, the Mustang caliper is a good compromise.

Yeah the problem I was having was trying to find a rear caliper with the park brake built in that would accept a 13" rotor as the largest you can fit in the Mazda caliper is 11.67. I agree I would like more pad as well but I feel this is a good compromise too. It increases all the key areas fairly well and keeps it cost effective. We shall see how it turns out though.

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Well like I said, I will buy your current rear brake bracketry setup. Let me know what you'd like for it if you want to sell it.

Did you have to modify the rear rotor brackets at all for rotor clearance?