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Old 10-29-2015, 11:42 AM   #1
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Default Track duty two piece rotors for R8 & RS5

RB (RacingBrake) is pleased to announce the availability of two piece rotors for RS5 & R8.

http://www.racingbrake.com/Two-piece...ont-p/2444.htm

This kit will oversize OE's 365x34mm rotors to the standard 15" (380x34mm) rotor allowing for larger thermal capacity, and easy to purchase for replacement rotor rings. Kit includes necessary spacers and longer bolts for a "bolt-on" installation. We have been shipping a similar kit for TTRS (upgrade to 380x32 from OE's 370x32mm)

These rotors will be built to the same exact metallurgy and specs as those we offered for those super muscle cars's OE replacment like GTR (09-11), Mustang GT500 (2013+), Porsche 911 GT3, Ferrari F430 just to name a few.
You can type in 380x34 in our search box to see the complete list mentioned above.

Click below to see our complete coverage on two piece rotors:
https://www.racingbrake.com/SearchResults.asp?Cat=7112

We also started a new thread under "Brake & Suspension" forum here, so you can relate your brake issue or improvement for all years/models:
http://www.audizine.com/forum/showth...1#post11116094

If you are looking for aftermarket replacement/upgrade or to inspire your confidence on tracks, talk to us and we will be glad to help.
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Old 10-29-2015, 11:43 AM   #2
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Old 10-29-2015, 11:43 AM   #3
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RB two piece rotors are built with these US patented designs (Center Mount design & Open Slots):
http://www.racingbrake.com/v/main/technology.asp

Pro/con of various brake disc finishing:
http://www.racingbrake.com/v/main/two_piece_compare.asp

Open Slots advantage over conventional slotting/drilling:
1. Keep the disc surface clean all the time
2. Will not crack around drill holes (like drilled rotors)
3. Slots will never disappear when wear down (like surface slots)
4. Increase cooling surface area (vertical walls)
5. Track proven result since we shipped STi/EVO/Z06 replacement in early 2000
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Old 10-29-2015, 11:43 AM   #4
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380mm shall clear 19" wheels w/o any problem. Open slots finish has been favored by both track racers and street drivers. Those slots allow a room to breath between the pad and rotor face while retain most of the brake surface yet w/o prone to cracking like drilled rotors (OE two piece Brembo two piece rotors for GTR).



In winter time, these open slots help to expel the water, slow or ice w/o losing the braking efficiency (due to water slippage) like those surface slots would.



As a side not, our customers also commented that the open slots actually help to reduce the brake dusting on wheels (spokes), as open slots can create a vacuum effect to channel the brake dust though the cooling vanes and blow off (to wheel barrel) than directly bounced to the wheel spokes like conventional surface slotting.

This is not a marketing claim - It's a feedback from several customers who install RB rotors and are more sensitive to their dusty wheels, that yet to be proven here in Audi community, we however do not imply our Open Slots design can solve the brake dust issue rather it can alleviate the situation.

Some brake threads that you might be interested in learning more about brake.

Racing Brake Technology - A Discussion about the truth of components

How a stronger/stiffer rotor means to brake torque

Procedure in rotor hardness test

Brake product knowledge on RB website:
http://www.racingbrake.com/v/main/product_knowledge.asp

Thank you.

Warren-RB
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Old 10-29-2015, 11:44 AM   #5
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Illustration of how RB two piece rotors are designed and made and why they can run cooler than conventional surface mount about 120-150 F.



Illustration of why RB rotors hardware design can reduce the chance of warping and how they function (of sliding effect vs. conventional floating) during heat cycles:
Fewer part, no spring, washer or glue - The self lock nuts maintain a consistent torque w/o being affected by brake temperature, just tight enough to still allow the disc to slide off the center hat during the heat cycles (expansion/construction). Sliding effect is more efficient and will not create noise than "floating" fastening like conventional two piece rotors.

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Old 10-29-2015, 11:47 AM   #6
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Quote:
Originally Posted by big_greasy_taco View Post
what type of spacers are needed? Presumably the OEM caliper would have to move out 7.5mm to accommodate a 15mm increase in rotor diameter. How is this accomplished (pics of the bracket would be helpful) and was any analysis performed on either the bracket or the bolted joint, to ensure OEM rigidity / strength?
There are different ways to accommodate the bigger rotor:

1. Use washer (custom size 1 pc) to space the caliper up, 2 per caliper like we supply for TTRS (required longer bolts)

2. Install caliper spacer like we supply for Porsche upgrade from 996 330mm to 997 350mm rotor, 1 per caliper (require longer bolts)

3. A new caliper adaptor made of light weight aluminum alloy replacing stock steel bracket, like we supply for Mercedes C63 360mm upgrade to Black Series 390mm rotor



All above will do the same job, we also supply longer bolt (Gd. 12.9 high strength steel alloy) for #1 and #2 - Once installed they will have the same integrity as OE installation.
#3 can also save weight about 1 lb but will also increase the cost.
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Old 10-29-2015, 11:51 AM   #7
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Quote:
Originally Posted by big_greasy_taco View Post
what type of spacers are needed? Presumably the OEM caliper would have to move out 7.5mm to accommodate a 15mm increase in rotor diameter. How is this accomplished (pics of the bracket would be helpful) and was any analysis performed on either the bracket or the bolted joint, to ensure OEM rigidity / strength?
Quote:
Originally Posted by big_greasy_taco View Post
How can you substantiate this claim? How do you define "integrity" - rigidity, strength, etc...? and what analysis / testing has been done to prove THE most critical safety device on the car is sound? All the options will push the caliper further away from its intended OEM mounting location, which makes it weaker. Coupled with longer bolts (which flex and stretch more) makes it weaker still. Also, longer bolts require a different installation torque - has that been accounted for? I am not saying this design will fail, but bolted joints are fairly complicated, more so then most realize. And then add heat into the equation (which there's alot of) and things get even more complicated still - fancy zinc plated Gd 12 bolts, how do they hold up, and will they lose torque over time with heat degredation? (yes)

Slapping in a spacer seems like a way to use existing 380mm inventory on another car, and sell more product without manufacturing a 365mm disc. Why not offer a 365mm disc as well?

oh, and 1# of weight savings? - taking a shit before going for a drive saves more weight then that! [poop]
RS5 has the same front rotor as R8 (since 2008+) which Alcon has been selling the same upgrade kits (390x34) using spacers since the inception of these kits.
http://www.brrperformance.com/store/...oducts_id=3328

In Porsche community it's a fairly common and popular upgrade (w/spacers) for 996TT owners to oversize their 330mm to 350mm rotors (search result from rennlist). This upgrade set up has been tracked by Porsche enthusiasts for at least 10 years now I believe.

We can make also make stock two piece rotors which can be offered as an option.
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Old 10-29-2015, 11:52 AM   #8
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Here is a thread discussing on Mercedes forum (MBWorld) for upgrading from SLK 05's 340x32 to 06+ 360x32mm rotor, which RB makes both:

http://mbworld.org/forums/clk55-amg-...-advice-2.html

The common question from users just like from any other car forums would be like this:
1. Is it available
2. How much
3. Is it worth
We usually like to address 1 & 2 from a mfgr stand point, and leave #3 to user's decision (like 365mm upgrade to 380mm in this thread). However if a user wants to know more we will then reply the advantage of a "bigger" rotor based on 'physics theory' stand point in order to keep this optional choice w/o being influence by a mfgr.
[indent][i]Bigger rotor has longer radius, and a longer radius 180mm (360mm rotor) will provide better mechanical advantage (more brake torque) vs. 170mm (340mm rotor).

Brake torque calculation:

Fn = Normal (Clamping) force is the force pressing brake pad against brake disc.
Fn = P * A (P=Hydraulic pressure; A=Piston area)

Fb = Braking force is the tangential friction force acting between brake pads and disc.
Fb = *Fn (=Coefficient of friction between pad and disc)

Tb = Brake torque is the moment of braking force about the center of rotation
Tb = Fb*Re (Re=Effective disc radius/torque arm)

Assume same braking force is applied, you get more brake torque (stopping power) with a bigger rotor, or require less pedal effort (hydraulic pressure) to stop a car than a smaller rotor.
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Old 10-29-2015, 11:53 AM   #9
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Quote:
Originally Posted by big_greasy_taco View Post
what type of spacers are needed? Presumably the OEM caliper would have to move out 7.5mm to accommodate a 15mm increase in rotor diameter. How is this accomplished (pics of the bracket would be helpful) and was any analysis performed on either the bracket or the bolted joint, to ensure OEM rigidity / strength?
Quote:
Originally Posted by auditink View Post
I have read on some other forums of some scary incidents using these rotors, like the mounting hardware and tabs shearing, separating the hat from the rotor disk while the car was being operated. Has racing brake resolved these issues or even tried looking into why this had happened? I have seen complete rotor failure using these rotors from racing brake, what was the out come with these customers after they contacted racing brake?
You can read the other side of (complete) story here:
http://forums.racingbrake.com/showthread.php?t=1482
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Old 01-23-2016, 05:45 PM   #10
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Following rotor/rotor kits for R8 and RS5 are shipping!!!

Stock Replacement:
http://www.racingbrake.com/Two-piece...ont-p/2339.htm

Front and rear bundle:
http://www.racingbrake.com/RB-Iron-R...aud-irk-04.htm

Front BBK (oversize to 380x34mm):

http://www.racingbrake.com/Two-piece...ont-p/2444.htm

Front and rear bundle:
http://www.racingbrake.com/RB-Iron-R...aud-irk-01.htm
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