This is looking like a very promising setup. It's probably the most affordable solution that retains the e-brake. I'm surprised more of you aren't participating in this.

I'd expect this to yield consumable dividends (bearings and hubs) similar to front bbk paying off in pad and rotor life.

My guess is that most of you don't know...

https://www.s2ki.com/s2000/topic/112...till-may-30th/

 

Thank you Bullwings, we were in the middle of posting an update but you beat us to the punch.

We have been working a 2 piece rear vented rotor for about 18 months. Our goal was to design a vented rotor that fit the rear brakes and save weight. The solid rear rotor has caused a lot of rear bearings to over heat and need a $1000+ repair. Simply having a vented rear rotor reduces rear bearing failure significantly.

Also, we wanted to keep the same OEM diameter so we do not alter brake bias and to reduce cost by using the OEM caliper mounts. If we would have made custom mounts, it would have increased cost by 40% or ~$300.

The rotor is 4.5mm wider than stock so you will have to shave new pads or install one new pad with an old pad and simply swap your rear pads more often to maximize use across old and new pads. You will also need to modify the rear bracket which you can see details on our site or we can do it for you for a fee and core exhange.

We were able to shave 2 lbs of weight per rotor due to the aluminum hats, which is huge as this is unsprung (improves suspension) and rotational weight (saves 4X net effect).

After discussing with 3 different disc manufactures we sent an email to girodisc, they called us with in 10 mins and we agreed on a design on that call. We sent a deposit for the design work and a batch of rotors and received the prototypes within 8 weeks. We have spent a month testing them and received unexpected results.

Our goal was simply to reduce overheating the rear rotors, we didnt realize how much of an effect this would have on brake performance. Simply keeping the rear rotors from fading significantly improves front rotor wear and overall brake performance as the rear rotors are taking on more brake load. Below is some testing feedback from our track tester.

• Tester has been road racing, time trialing & professionally prepping cars for 20+ years
• Track records at 3 different track in 2 different cars
• AP2 Supercharged, 390-450 WHP depending on event/class
• Hoosier Tires, 3150 lbs w/ Driver, Street legal & full interior
• Testing done at VIR, 3 day weekend, 9 20-30 min sessions.

“The short story is the car stops better-my lap times improved (I made no other changes)-my brake zones (2 areas from max velocity to threshold braking) where compressed-the "balance" of the car under braking is much improved-my car liked the fact that there was "more" rear brake-car is more stable under threshold braking-rear brake pad wear has reduced (I did not change brake compounds, I run Carbotech pads). I don't like that the brake pads need to be shaved but I have learned that every time you modify a car, there has to be a compromise, so shaving the rear pads is just a little compromise to get improved braking”

Note; Customer normally replaces Stoptech rotors after 2 weekends/12 track sessions due to cracks. The customer noticed no Stoptech cracks after 9 20-30 track sessions using our Flow Rear Rotors

[attachment=79752:Flow Rear Rotor.JPG]

Our Rotors are now available to order. We are running a Launch buy to figure out how many to make in our first batch. We plan to order 5-10 extra to keep them in stock. We will go to production after the Luanch buy ends and it will take 3-4 weeks after that to ship.

We are offering a Launch Discount due to waiting for the first production run We also have great combo deals if you need 2 piece front rotors or a front BBK.

Flow Rear Rotor Details on our Site List price is $700 & Rotor replacement cost is $350.

Let us know if you have questions, thanks for rearing and thank you BW for posting!!

 

Can you disclose the mounting flange thickness for the rotor where the rotor meets the hat? My concern is longevity/durability with this setup.

Also, any data on how much it drops the temperature at the hub?

 

We saw this question and don't have the blueprints yet. I am waiting for Girodisc to get back to us. I am confident it wont be a weak point though.

The customer did put temp paint on our rotors and never got them close to over heating or change color despite the increased braking performance. They didnt have details not he OEM rotors, just noted rear brake performance.

 

Probably good rotors and a decent price. I did pay less for my RB 2-piece rear rotors, and they are considerably larger (328x17) and include a replacement caliper bracket (no mods necessary, can return to stock in 5 minutes per corner). I do like that these save more weight and inertia due to not being any larger than stock. As the RB kits are hard to find and have unpredictable pricing, this is probably the best current option.

 

They do show being discontinued and a sale price of $1,244. Even with our caliper mode we are almost $500 less. They do offer their pads, but almost everyone will go with their own so I don't see a lot of value with including pads. Of course you can get RB second hand or for a closeout price that can compete with our pricing. We will keep these in stock and have low cost and available rotor replacements as needed.

We do weigh less as you noted and have proven brake gains with our design.

Also, RB has issues with popular S2000 Track Pads. http://www.racingbrake.com/v/main/pad_warning.asp

Either way, we recognize Racing Brake for putting their kit out there and designing S2000 parts. This made us strive to design something better and we feel we did.

 

I've known about the RB kit for a while, but found the racing brake solution to be too pricey for what it was. Additionally, RB hasn't always had the greatest reputation for customer service - my friend had a full on BBK failure with their kit in his GTI - posts from that failure can still be found on the golfmk6 forums. RB wasn't very accommodating - he ended up with a stoptech trophy kit afterwards.

I also am not as confident with RB being able to support replacement rotors long term. I know robrob was using this kit, but eventually went back to stock due to a support issue (I tried buying his kit the last time his motor blew and he was contemplating parting out his car)...

For the most part, I think both Urge and Girodisc are pretty reputable, and I don't worry about replacement rotor supply as much in the case.

 

Patrick - are there plans to option for a larger rotor diameter? A larger rotor would help with bearing wear, as it has more thermal mass. It would also pair well with a large front BBK.

 

Not at this time. Based upon the success of testing, we are big on not going bigger if it is not needed.

Our tester had a 3150 lb, 450whp supercharged with a Stoptech Trophy kit on the front. He ran 9 20-30 min sessions at VIR with no rear fade what so ever which also means little to no heat into the rear bearings. Also our rear brakes more than doubled the life of his stop tech brake rotors. So we feel they provide more than enough capacity due to the cooling. If someone out runs these brakes, we will look into it.

For the time being we are running with this diameter.

 

Girodisc did a fantastic job with the initial offering of their front rotors when they ran into minor issues. They refined their design and quickly got it out to all the people testing and I have run them for quite some time going through multiple sets of rings on the fronts with no issues. Very glad to see you worked with Girodisc on these.

Great to see more people getting involved in products they actually test and R&D and refine.