First off al, don't shoot me but today I was at the local Mitsu dealership and they had an Evo 9 in the showroom.

I had some time so got a quick look around.

These cars habe Brembo front and rear brakes and although they have thesame number of brake cilinders I was wondering if those would be an upgrade compared to the stock FD system.

Thx

 

Do not do it.

The Brembo calipers on the EVO were not designed for the FD.
End of story.

You will NEVER see a Ferrari or Dodge Viper use a Brembo caliper off a EVO or 350Z. Why? Because it isn't a good idea. You can probably make it fit...but it isn't designed for any other car in mind.

 

Well...I retract my statement to say this instead.
Usually brake "upgrades" are just that. They use BIGGER calipers/rotors.

Admittedly, I do not know the size of the EVO calipers, but I am pretty confident in saying it is smaller...if not, and the same size of bigger...but only marginally bigger. NOT significantly larger.

Therefore, it is a useless "upgrade" IF you can make it fit.

 

There is a lot more to calipers and rotors than sheer size. In any case, you should probably read up on the RacingBrake thread. Howard Coleman dumped his AP racing calipers/Coleman rotors(?) in favour of the RacingBrake setup.

 

Yup... you've got to look at piston sizes F/R, MC size, adapting rotors... bad idea. Never mind that you won't have an e-brake unless you figure out how to adapt the internal drum setup that goes w/ the fixed rear calipers.

 

The master cylinder doesn't affect braking performance, just the brake feel, right?

 

Not necessarily. If the MC is too big, even an NFL lineman wouldn't be strong enough to stop the car. Too small, and the MC can bottom out before moving enough fluid.

 

Well, I would assume he'd keep the stock MC even if he upgrades his calipers. Unless he gets something GIGANTIC, I don't think he would need Herculean strength to depress the brake pedal.

Have you ever stalled while on a roll and tried stopping the car without assisted brakes? I guess that's the worst it could ever get.

 

MC size is a relative thing. If the new calipers have tiny pistons, then even the stock MC becomes effectively bigger and requires more leg. Hydraulics are just like levers: either you push harder or farther. And some part of the system eventually runs out of travel.

 

The idea was to just replace the calipers and stay with stock disc or upgrade (slotted/grooved)


I was just imagining that the Brembo's would possibly be better handling head, fading, have more pressing strenght. Also the back would be able to keep the handbreak option.

 

First off:

1. Can't use the rear caliper, you will lose ebrake function.

350Z, EVO, and STI all have drum style ebrakes, not like the FD. you would need to incorporate a hydraulic ebrake mech in line with the current setup.

2. You would need to produce 4 caliper brackets to make it work.

3. If you use the EVO Rotor, the centerbore is the same so you just have to compare the offset of the rotor hat.

ONCE AGAIN THE REARS WOULD NOT BE A GOOD OPTION BECAUSE IT IS A DRUM STYLE ROTOR HAT.

Ideally you would just use the front calipers and use the racingbrake rear upgrade with the FD OEM Caliper setup. the rotors will be nearly the same size Front and Rear then.

i'm not endorsing this or implying it will improve performance. i'm simply giving you the low down on what would need to be fabricated and taken into consideration.

Rishie

 

Rishie rocks.

 

There's a reason they call it a brake system...

 

The FD calipers (at least in the front) are pretty decent. To upgrade performance significantly, you need bigger rotors. Adapting the Brembo calipers from an Evo to work with the stock FD rotors would be a ton of work for little gain, assuming it worked out well enough to be better at all.

-Max

 

Why would you think that? The stock FD calipers are 4-piston with pretty large pistons.... Brake fade has little to do with caliper design unless the pad size is significantly different.

Bottom line, you want better braking, buy stickier tires. If you need more fade resistance, get a brake PACKAGE upgrade that includes larger rotors and hopefully larger pad sizes.

 

point made ;-)

I just bought set (4) of Pirelli Pzero Corsa's in 255/35/18 so I'll have plenty of grip to help my stock braking system.

Thx for the info guys

 

Fd With Front Evo Brembo ,320mm Rotor...

 

Any more details?

 

We offer a very nice Stop Tech Big brake kit for the FD's calipers come in Red Black or Yellow. call for details or go to Stoptech.com

 

I spoke with Tripoint about the Stoptechs at SevenStock. They actually had some great pricing on the kits w/ pads.

 

I would have to agree with everyone on staying away from the Evo Caliper. The FD stock brake system is very well balanced, by going with the EVO Caliper, you are probably going to be braking worse than stock in distance, given everything is equal.

Formula below was taken from the Stoptech Technical White Papers and give us a generalized answer if its even close to the stock system.

1. Torque created by the caliper on the rotor (at the wheel) = TW

TW = PS x AP x µ x 2 x RE

PS = Pressure of system; AP = Total Area of pistons in one half of caliper (one side of
opposed type or active (piston) side of sliding or floater type); µ = Friction Coefficient; x 2, since
there are two sides of the rotor that the pads are exerting force against;
RE = Effective Radius of clamping force.

We can assume that the pressure of system (master cylinder) will be the same and the µ (brake pad) will be the same so we are left with AP and RE.

FD RX-7 Stock Front Calipers
TW = 101700

EVO Stock Front Calipers
TW = 204190

If my caculations are correct this is a ~50% increase in front torque

FD front piston size is 36mm x 2
Contact patch is roughly 50mm

EVO front piston size are 40mm and 46mm
Contact patch is roughly 70mm

Every kit that Stoptech makes is required to meet stock specs and if it can be approved upon, they will do that. Generally they only have to shift front or rear brake bias a max of 5%... Also FYI, Stoptech will be one of the only brake manufactures that will have an in house brake dyno.