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Old 01-17-2006, 04:37 PM   #1
moxie
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Join Date: Jun 2005
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05 TrackwhoreWagon
HookerRed (STI Longblock)

Default Racing Brake Upgrade Kit - Aluminum 4 Pot

What: Racing Brake Upgrade Kit
***Scroll Down for Cliff Notes**

This kit includes:
* 2 One Piece Stock Sized Slotted Rotors
* 2 4-Piston calipers
* 2 Aluminum adapters and hardware
* 1 Set of Hawk HPS brake pads

Caliper features:
* Body machined from 6061-T6 forged aluminum.
* Piston sizes are 38mm x 38mm.
* Double-sealed pistons with external fluid crossover.
* Saves almost half the weight of JDM 4 pistons.
* Powder coated red, resistant to heat and brake fluid.






When: January 4, 2006


Where: Purchased at Surge Street Shop in Tempe, AZ (www.surgeusa.com)
-Parts were in stock, I walked in, paid, and took them home.
-http://tinyurl.com/bjnp5

Tested at Phoenix International Raceway (PIR) on January 8, 2006 (ASRA HPDE)
-Moderate to high speed track
-Hard braking zone from 85mph to 25mph
-Moderate braking from 110mph to 80mph
-Hard braking zone from 85mph to 35mph

Car Setup:
COBB Stage 2
Tein Basic C/O
Perrin RSB
PIAA 17x7.5 wheels
Hankook Z212 225/45/17
SS Lines
ATE Super Blue fluid
RB Upgrade Kit
HPS Pads

Installation:
Fairly straight forward, though no instruction manual was provided.
I removed the old calipers and mounting brackets.
Then removed the line to caliper banjo bolt, and remounted to the new caliper.
The brackets are nice aluminum pieces, and you need a 3/8" allen to attach the callipers to the mounts.
The RB slotted rotors went on easily followed by the adapter to the hub.
Pads go in pretty easy the first time, and the pins are all held in with spring clips, so they remove and install easily.
Rinse and repeat for the second side.
Bleeding went well and resulted in a rock hard pedal, with good modulation.

Test Data:
I have been monitoring my brake system performance at monthly events since September 2005.
After upgrading to HP+ pads I noticed a significant increase in braking system performance but as I turned faster and faster laps at PIR I found I
was experiencing moderate pedal fade after only 3-4 laps, and the brakes would become almost scary at points after 6 laps.

In my search for an upgrade I considered 2 Piece upgrades from Powerslot, and Racing brake, before finally settling on the RB Upgrade kit.

Pre-Upgrade:

At previous events I observe post cool down lap rotor surface temps in 700-800*F range.
This was averaged over the surface by using a pyrometer approx. 6" away from the surface.

At the track days I also had the chance to measure Stock 04 STi Rotors, and an 04 WRX Wagon with a Brembo GT2 Kit.
Compiled results were as followed.
(All results were measured after 4-5 full speed 3 car-in-line pursuit laps followed by 1 cool down lap)

Stock WRX Rotors
700-800*F

Stock STi Rotors
450-500*F


In terms of brake feel and fade, the other 2 drivers (STi and Brembo) did not complain of fade or loss of pedal as early or as severely as I did.

*These results were averaged over the course of 4 HPDE events.*
*Ambient temps varied from 60-90*F and did not appear to have a massive effect on cooling performance.*

Post-Upgrade:

At the last event (January 8, 2006) I started the session as normal and lined up behind the Silver Wagon with Brembos.
We played a few laps of “follow the leader” before traffic got dicey and split us up.
I was trying to get a feel for the new brakes and I came away from the session with the following conclusions
-I was able to brake hard for the entire 20 minute session. Pedal never traveled to the floor
-Brakes were able to retain modulation and feel for longer time period
-I began to experience pad fade before I was even close to boiling the fluid

Throughout the day I was consistently able to stay with the Silver Wagon, where previously my fading brakes would make it impossible to keep even close to the same pace after more than 5 laps.


Rotor temps at this event were mostly compared with the Brembo GT2s as I was unable to run with STi.

RB Upgrade Kit
500-600*F

RB 2-Piece Stock Size STi Rotors (Upgraded as well, but owner did not run with the other 2 cars)
450-550*F


Conclusion:
-The Racing brake upgrade kit performed better than expected.
-The system appears to cool more effectively, while providing longer lasting and more consistent braking performance and pedal feel.
-Currently the system showed a 100-200*F temperature reduction in rotor surface temps after the cool down lap, this is achieved by using a Racing Brake 1 piece rotor, and 4 Piston Aluminum Caliper.
-Calipers should weigh between 6-8lbs, good weight reduction over stock.

This is definitely a worth while upgrade.
The weight savings in my opinion make them better than the Suby 4-pots, and their performance was proven.



Cliff Notes:
Decent Price ~$1100
Easy install
Built stateside in NJ

Brakey really Goody
No fadey like stocky

Lighter than other stock size options
Should fit under stock wheels. (Good for you snow country people)


I definitely want to thank Surge Street Shop. Parts were in stock, and it is nice to have access to this level of parts and support locally.


-**Side Note: This kit can be upgraded to a BBK with new adapters and rotors... IMO this is one of the best kits for the money, and you can stage yourself up to bigger and better when time and money allow.**-
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Last edited by moxie; 02-10-2006 at 11:09 AM.
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Old 01-17-2006, 04:54 PM   #2
WgnWheel
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Default

nice writeup! and im the one with the brembo bbk that we've been comparing too. I've seen all the racing brake kits now at surge, and they are really nice. and the stock brakes, even with upgraded pads just dont cut it for track days. If I had known about the RB kits before i bought the Brembo bbk, i would have gone RB and saved a good chunk of change.

Also of note, i met the designer of RB while he was in town visiting Surge and he was a really great guy and definetely knows his stuff! He showed a big interest in subaru.
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Old 01-17-2006, 05:15 PM   #3
pickinicholas
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Default

Nice write up... Too bad I already converted to STI Brembos... But I do have the Racing brake slotted 2 piece rotors to put on my car. Thanks Surge!
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Old 01-26-2006, 04:12 PM   #4
moxie
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HookerRed (STI Longblock)

Default

UPDATE

I had the 2 piece stock sized rotors on for the last track day on 01/22/06.

I will get a full review up shortly.
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Old 01-26-2006, 04:16 PM   #5
Psydotek
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with too many lights...

Default

Excellent. I'm looking at these as my next major upgrade.
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Old 02-03-2006, 09:38 PM   #6
Drew888
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Looking forward to the update
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Old 02-05-2006, 03:51 PM   #7
moxie
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Default

Ok guys

I posted it here:
http://forums.nasioc.com/forums/show...6#post12575766

Thanks for your interest!
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Old 02-27-2006, 08:43 PM   #8
Psydotek
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Default

Bump, i have a question...

When connecting the calipers to the mounting brackets, how tight do the bolts need to be? How do you properly tighten them using "only" an allen wrench? Do they use lock washers? High temperature threadlocker recommended?

I suppose they can't be too tight because the adapter mount is aluminum, but i also don't want my calipers coming loose when braking. Just wanna check before i put down the $$$ for this.

[btw, i'm using the OEM torque values for reference. bracket->car bolts: 59 ft/lbs, caliper->bracket bolts: 29.5 ft/lbs]
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Old 02-27-2006, 08:49 PM   #9
moxie
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Default

Quote:
Originally Posted by Psydotek
Bump, i have a question...

When connecting the calipers to the mounting brackets, how tight do the bolts need to be? How do you properly tighten them using "only" an allen wrench? Do they use lock washers? High temperature threadlocker recommended?

I suppose they can't be too tight because the adapter mount is aluminum, but i also don't want my calipers coming loose when braking. Just wanna check before i put down the $$$ for this.

[btw, i'm using the OEM torque values for reference. bracket->car bolts: 59 ft/lbs, caliper->bracket bolts: 29.5 ft/lbs]
I made bracket to caliper bolts very tight. I didnt have an allen socket so I couldn't use a tq wrench. Just make sure they are tight, it would be hard to get them too tight but be a little careful. Mine had a little thread locked on the bolts already, and do not use lock washers.

The bracket to knuckle bolts can be tourqed about the same as stock, you use the same bolts so the values can be similar.

Also, you should never have to remove the caliper to bracket bolts, just remove the bracket if you need to remove rotors, etc...

I really can't say how worth the money the kit is.
I have another track day coming up, so look forward to some more data
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Old 03-01-2006, 05:04 PM   #10
moxie
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Default Installation Information

http://www.racingbrake.com/main/tech...20Installation

There's a link to the install info
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Old 04-10-2006, 03:01 PM   #11
Psydotek
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Bump, another question...

How/where do you source individual parts if you ever do need to rebuild the calipers (replacing the seals and/or pistons)?
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Old 03-10-2007, 07:49 PM   #12
Amazake
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Looking for updates and current Nasioc aluminum stock size wrx brake kit..
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Old 04-06-2007, 11:58 PM   #13
Kamikaze531
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Another bump. Have you tried them with track pads yet?
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Old 04-22-2008, 11:13 PM   #14
Frank A
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I just ordered these with the 332mm rotors and brackets as well so I could run both 294 and 332 setups. I ordered them with ET800 and ET900 pads. I'll be tracking the 332/ET900 setup on 5/4-5, so I'll start a new thread then. I'll push the ET800's with 294 rotors on some street canyon runs and with my rally wheels and report on that combo.

Right now, my only beef is that they are overpriced. I'd buy the awesome Stoptech 355mm kit for over $500 less if the caliper could be used on 294mm rotors, but they don't have a design that supports that.

oh yeah, also RB introduced a new caliper this year, the RB4045, that replaces the old CP4 caliper. Big difference to me is stainless steel pistons instead of aluminum to reduce heat transfer to the brake fluid. Hopefully the calipers are stiffer too, but I'm not holding my breath on that one.

Frank
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Old 04-23-2008, 01:29 AM   #15
suby_dude
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Very nice write up! I've drove a local WRX that had this kit installed with his OEM 16" WRX wheels and the brakes were awesome. A huge improvement over stock calipers for sure.

I have one kit left in stock that is on clearance pricing, if anyone is looking to pick up a kit for cheap send me a PM!

-Dan
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Old 04-29-2008, 12:14 PM   #16
Frank A
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Ok, I found a picture of the old CP4 calipers on a web site, and without having either in front of me, I will say that the new design does look like it will be stiffer. The calipers appear to extend further out at the "ears" and a stiffening rib appears to have been added from the ear back to the cylinder body. Hopefully this will help. At the same time, they appear to have trimmed away some unneccesary metal around the cylinder bodies. Good work.

Frank
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