$600 Brake retrofit, Cadillac ATS brembos, STI rotors.

[sickmint79]

Originally Posted by Tokay444

Use a different pad compound in the rear and call it a day.

is that what people do though? you have looks only people who just buy the cheapest thing and stick it in there. tracky guys are going to put something reasonably high temp and high friction in there. i like carbotech... they don't even appear to make pads for it. once you put your front pad in to the brake calculator, and work back the equation from your desired bias to the the minimum friction for the rear pad, are they even going to find something they can buy?

[Moto-P]

Originally Posted by etc

Since I don't see any posts about it thought I would share here. A new budget option for larger brakes on the 86.

I was doing some math on this system, and paired with stock, it is one of the most cost-effective ways to gain heat-resistance related gains on the 86/FRS/BRZ. The caliper piston fluid volume is not a huge increase over the stock and well within the capacities for the brake master, as well as electronic proprotioning/ABS/stability control system of the ZN6 chassis.

It isn't the true racing application system like those sold by Brembo, AP, Alcon, which are proven in years of racing, and these are lower-cost non-monoblock calipers commonly contracted for OEM use. As such it isn't going to be something to be commonly done on a true race car.
However, these are newer design than the Sumitomo supplied Brembo branded Subaru STI brakes, and are made with nicer caliper body with higher weight and density.

AS with any "CONVERSION" kits though, it does require very high-quality brake adapter kits and capable amount of precision labor. These CTS-V Brake Swap brand machined unit for the ATS-V to FRS kit is pretty good.
I do warn you that BRAKE SERVICE of ANY sort is a very system critical work, so if you are not too familiar with working with brakes, or have not done so in the past, no matter your mechanical expertise, to hire a second hand who is very knowledge in brakes. It is not just about hardware but there are many skills and know-how for brake lines and servicing of fluids that one would need to do it right. These are the only things that's going to help you stop a car so any faults in the system means you are playing with your life... Yes you can DIE if they stop working.
So heed warning, this is very critical work.

So that precaution aside. I can recommend it for those who are on a budget and thinking update the brakes. Keep in mind, for Sunday racing use such as autocross or casual track days like HPDE, the STOCK FRS/BRZ system works perfectly fine with pads upgraded to something good. This update is mainly suggested for those who just MUST have a BBK look, and to keep it just as effective as stock with a slight advantage.

$4000+ kits from Brembo/ALCON/AP are justified, and do perform better than these for sure. They are more rigid, and are designed and calibrated to be better, and are matched and proven on the track with each application.
No mistake there. Lets just say this is closer to stock in performance therefore.
With these ATS-V Brembo OEM swap, you will get ever so slightly more pedal stroke as fluid displacement for master cylinder will increase tiny bit. It will stop with slightly higher tenacity with lighter pedal pressure as pad surface as increased. Both of these parameters will change greatly with different types of pads, and that more than anything related to caliper swap really as the pad surface does not increase by a huge amount here. The swap will dissipate heat better than stock, since the rotors are larger. The rear brakes will work a little harder to stay in check with the bigger front, but well within capacity for most track use.

But like anything with FRS/BRZ it is ultimately the driver who makes or brakes a car, performance, and numbers it can put out. Also, keep in mind that all brakes must be tended and monitored with driver skill too. Cooking the brakes will make them fail or fade without skills of a driver to keep them effective in temperature and use, as well as excellent maintenance.

[finch1750]

Originally Posted by sickmint79

i recently wrote an article on this comparing a bunch of kits - http://sickmint79.kinja.com/ats-and-...brz-1786142903

i don't understand the dismissal of bias given that a lot of r&d and testing goes into getting it right. and we are talking about brakes here. do people spend money on heavy wheels, crappy all seasons, and make their cars perform worse all the time? yes. but i find that particularly egregious when done so with brakes. why pay money for an upgrade that is really a downgrade?

the calculations i had resulted in the OEM bias of 0.697 going to ATS bias of 0.738. 0.738-0.697 is 0.041. 0.041 / 0.697 = 5.88% deviation from stock more forward. in terms of Front:Rear ratio, 2.3 to 2.8.

this is audi 2001 s4 data, but look how large a swing "only" 5.88% of a change can make moving 0.5 along the F:R ratio.



at least with heavy wheels maybe someone is naive about how that stuff works. but with brakes, people knowingly dismiss that the bias is off based on arbitrarily deciding 5% is a problem or not. something 5% off in your engine blows it up. how is anyone deciding that 5% can/should be ignored or not?

would a 10% swing suffice? that would be 0.7667 forward or 0.6273 rear. or for F:R, 3.29 and 1.68. it's "only 10%" but it's starting to reach the extremes of both ends of the stoptech chart.

Idk. The guys from Essex Brakes said within 5% was cool in the Z32 caliper thread. So I'd say the probably wasn't to arbitrary and would trust their judgement considering their expertise. The issue is the electronics gettin wacked out so as long as it doesnt do that it is safe I think is the point. Im guessing they know how big a change the system can take.

I'm not saying I would buy this kit based on that but just saying it's been said by experts. Props for running the calcs on all those btw

[etc]

To address the bias shift I have tested swapping evox calipers over to create a matched set: http://www.ft86club.com/forums/showt...14#post2894514

As noted there, this will essentially bring this kit in parity with the '17 BRZ PP's, aside from the small issue with the pad overhang.

[Chronology]

Can anyone confirm fitment on 17x9 +35 RPF1s?, or explain how to measure the clearance?

[SkAsphalt]

Originally Posted by etc

I dropped the dust shield, the install instructions (which are quite good btw) say you can trim the dust shield to make it fit but I opted to just drop it.

I am running 18x8 tsw nurburgrings, can't say if they would fit the stock wheels. I assume it would be similar to the sti brembos.

I had NO idea brembos would fit with TSW nurburgrings and now I really want them...shiiiiit *this is probably a super old bump but I am excited now.

[Qc86]

Bringing old tread back but i want to upgrade to cadillac ats v and it seems like they discontinued the passenger side caliper (172-2587).

They say on amazon the new replacement is 172-2768. Can anyone confirm it will fit ? And if anyone know why they changed the part number? Huge thanks

[turbocat]

Originally Posted by Qc86

Bringing old tread back but i want to upgrade to cadillac ats v and it seems like they discontinued the passenger side caliper (172-2587).

They say on amazon the new replacement is 172-2768. Can anyone confirm it will fit ? And if anyone know why they changed the part number? Huge thanks

Check CTSV Brakeswaps website they just announced the calipers had a part number change.

[turbocat]

Finally installed my ATS Brembos and also changed the rear calipers to WRX 2pot calipers.

I used DBA front rotors for my new bigger Front rotors.
Also used StopTech Street Performance pads all around.

Wheels are Apex Racing ARC-8 17x9 42mm offset.

I used a grinder on both top and bottom of the calipers outer edges. I wanted the most room for wheel barrel clearance.

Calipers are rattle can VHT caliper paint Yellow and Orange with a top coat of Clear.

I misted the Orange onto the Yellow while the paint was still wet to get the darker shade of Yellow.

I plan on doing black painted Brembo logos on the fronts soon.

[Capt Spaulding]

Very nice, turbocat.

[No1der]

NEW PART NUMBERS:
Driver Caliper- AC Delco- 172-2777
GM- 84089034
Passenger Caliper- AC Delco- 172-2768
GM- 84089035

OLD PART NUMBERS:
Driver Caliper- AC Delco- 172-2586
GM- 22760030
Passenger Caliper- AC Delco- 172-2587
GM- 22760031

[poolboy54]

What wheels are y'all running with the brake swap. I'm looking at RPF1s(18x8 +35). Do they fit? Thanks in advance

[Tokay444]

Originally Posted by poolboy54

What wheels are y'all running with the brake swap. I'm looking at RPF1s(18x8 +35). Do they fit? Thanks in advance

I can't confirm that they don't, but I can say the RPF1 is one of the least friendly wheels for big brakes. I that size you might be ok, but don't get your hopes up.

[poolboy54]

Originally Posted by Tokay444

I can't confirm that they don't, but I can say the RPF1 is one of the least friendly wheels for big brakes. I that size you might be ok, but don't get your hopes up.

Thanks

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