Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB
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Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB (https://www.ft86club.com/forums/index.php)
-   Suspension | Chassis | Brakes -- Sponsored by 949 Racing (https://www.ft86club.com/forums/forumdisplay.php?f=59)
-   -   deciding on BBK (https://www.ft86club.com/forums/showthread.php?t=71445)

ATL BRZ 08-04-2014 11:13 PM
Love my AP Sprint BBK. Takes a pounding on track and asks for more. Pads are cheap and thickest around. No boots to burn up and the calipers are cheap/easy to service :)

http://i.imgur.com/GfMsRaa.jpg

I think you'll be happy with it. The best BBK available for a track application. Talk to @CSG Mike about Sprint vs Endurance kits and see which one you'll want to go with.

Over 400whp may necessitate the Endurance kit if you get lots of track experience and need extra thermal capacity and cooling ducts.

Reaper 08-04-2014 11:14 PM
Thanks Ian.
What pads do you run?

ATL BRZ 08-04-2014 11:24 PM
Quote:
Originally Posted by Reaper (Post 1882449)
Thanks Ian.
What pads do you run?
Track: CL RC6 front (came with BBK) and Carbotech XP12 rear

Street: Carbotech Bobcats (1521) front and StopTech Street performance rear

dradernh 08-04-2014 11:37 PM
Quote:
Originally Posted by ATL BRZ (Post 1882447)
Talk to @CSG Mike about Sprint vs Endurance kits and see which one you'll want to go with.

Over 400whp may necessitate the Endurance kit if you get lots of track experience and need extra thermal capacity and cooling ducts.
This, although I would say 'will' instead of 'may' if you're really using the car on the track.

glamcem 08-05-2014 12:59 AM
Quote:
Originally Posted by CSG Mike (Post 1882262)
Tapering is a result of caliper flex, which is common on floating piston calipers, but not monoblock calipers. It's impossible for a liquid to distribute force unevenly over a flat surface, like a brake piston.

Imagine prying a caliper apart... that's what happens when you brake hard and the caliper is really hot. That's why the upper/outer edge of the pad wears faster under harsh conditions :)
interesting, so are you suggesting that 6 pot caliper design has no advantage over the 4 pots ? because all things being equal 6 pot should provide more pressures zones :iono:

and the cost advantage on the Wilwoods are huge IMO, $1400 vs $2100 ..it will be a tough decision when the time comes :)

Captain Snooze 08-05-2014 05:26 AM
As an added bonus the Essex Sprint Kit lose 4.5 kg per side over stock. Win!

CSG Mike 08-05-2014 05:54 AM
Quote:
Originally Posted by glamcem (Post 1882565)
interesting, so are you suggesting that 6 pot caliper design has no advantage over the 4 pots ? because all things being equal 6 pot should provide more pressures zones :iono:

and the cost advantage on the Wilwoods are huge IMO, $1400 vs $2100 ..it will be a tough decision when the time comes :)
More pressure zones does not equate to more pressure area. If the area is increased with the same total brake force coming from the master cylinder, then bias is being changed.

The Wilwood SL6R caliper is virtually identical to the AP Racing 8350.... I wonder why that is.

Dave-ROR 08-05-2014 08:06 AM
Quote:
Originally Posted by Reaper (Post 1882063)
ok so the sprint kit has no boots, which kit has boots and is powdercoated. I mixed them up in my head. I DD my car and those are features I want.


Don't get overly concerned about dust boots. If you generate enough heat on track you'll just melt them anyways (which is why race calipers don't bother with them).


I've used the Sprint kit for about 17,000 miles I think, street and a fair amount of track use. They are perfectly streetable. They will make noise with track pads, but there are some street pads that are pretty quiet and you can get non j-hook rotors which should help the noise also (but I haven't tested it since I don't drive my BRZ anymore).


If you are looking for pretty calipers, well I think gray aluminum is pretty, but the AP formula kits, the stillen kits and the stoptech are all good options.

Dave-ROR 08-05-2014 08:10 AM
Quote:
Originally Posted by CSG Mike (Post 1882262)
Tapering is a result of caliper flex, which is common on floating piston calipers, but not monoblock calipers. It's impossible for a liquid to distribute force unevenly over a flat surface, like a brake piston.

Imagine prying a caliper apart... that's what happens when you brake hard and the caliper is really hot. That's why the upper/outer edge of the pad wears faster under harsh conditions :)
But Wilwood calipers do flex more than APs. Talk to some dirt track guys, they can show you some Wilwood tacos...

Reaper 08-05-2014 08:10 AM
I think I'm decided on the sprint kit and if the winter looks like its going to be bad ill just put the stock brakes back on. What pads do you run? @Dave-ROR

Dave-ROR 08-05-2014 08:10 AM
Quote:
Originally Posted by AZFA20 (Post 1882294)
Another viable option is Baer brakes. The only thing is they are 14" rotors in the front so 17" wheels that would fit are scarce. It would require an 18". Pads are readily available in just about any compound since they are corvette pads. Essex and Stoptech are obviously good choices too but this gives you another option. They utilize 6P (6 piston) front calipers with piston seals and S4 (4 piston) rear calipers also with piston seals. I personal'y run the Baers and have been for 1.5 years now. I have owned several Baer products (mostly BBKs) and have never had a failure. I can tell you the Baers on this platform literally make me sick to my stomach under full brake from 120+ mph coming into a turn from straights.
The fact that they are 14" means that aren't a serious consideration beyond looks. Unless you like slowing your car down... when you aren't using the brakes.

Dave-ROR 08-05-2014 08:11 AM
Quote:
Originally Posted by ATL BRZ (Post 1882463)
Track: CL RC6 front (came with BBK) and Carbotech XP12 rear

Street: Carbotech Bobcats (1521) front and StopTech Street performance rear
Do you like the RC6 as much as I do? :)

Dave-ROR 08-05-2014 08:17 AM
Quote:
Originally Posted by glamcem (Post 1882565)
interesting, so are you suggesting that 6 pot caliper design has no advantage over the 4 pots ? because all things being equal 6 pot should provide more pressures zones :iono:

and the cost advantage on the Wilwoods are huge IMO, $1400 vs $2100 ..it will be a tough decision when the time comes :)


More pistons will generally mean better modulation and better pad life if they are differential (more piston area in the direction of travel to prevent tapering in the longitudinal direction). AP 4 pots used in the Essex kit are diff too and I've only noticed very slight tapering.


The rest comes down to piston area to determine how the brakes would feel and what their effect would be at a given line pressure.

Dave-ROR 08-05-2014 08:19 AM
Quote:
Originally Posted by Reaper (Post 1882758)
I think I'm decided on the sprint kit and if the winter looks like its going to be bad ill just put the stock brakes back on. What pads do you run? @Dave-ROR
Well noise doesn't concern me, I have track pads on every car I own.. soo..


I use Project Mu 999's (from @CSG_Mike) and CL RC6 and RC6E from @JRitt


Actually the RC6 might be on one of the Integras, hard to remember anymore.


For street use I'd look at the blanks instead of J Hook and the street/autocross Carbotechs. They are cheaper than track pads though so get good expensive pads at the $25 rate and buy those separately :)


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