Wilwood 2 piece 14” front rotor weight
 

I’ve narrowed my search for front 2 piece rotors on my 2013 GS to Performance AFX slotted HD rotors (from Zip) or the 140-12496 Wilwood slotted rotors.

The AFX rotors save 12lbs of weight (6 per side). Does anyone know the Wilwood weight savings? My search/Google skills have failed me :(

:cheers:

Shipping weight on the 140-12496 is 50lbs.

No idea what 25lb vs stock is however.

shipping weight and rotor weight is totally different.

that being said my stock 14" camaro rotors weighed bout 25lbs each

Thanks Todd! Stock rotors are 26lb each, so not much savings with the Wilwood rotors even if there's 3-4 pounds of "shipping margin" built into the 50lbs.

Have you looked I to girodisc? I have their two piece rotors on my c5. Super nice piece. https://cimg6.ibsrv.net/gimg/www.cor...0cdeacfe7c.jpg

Since we're getting a bit over technical here....

Slotted rotor 21.7lbs
Drilled rotor 21.6lbs
Hat 1.61lbs
Bolt kit .23lbs

So yes; roughly 1.5lbs per side with the shipping.

Interesting and they're about 1lb lighter than the Performance AFX HD rotors.

Are you using them for track days? If so, how are they holding up?

Seems the Porsche and C7 guys like them although it's hard to tell how many just get them for bling.

The rotors I got from ZIP, which were 2 piece with Coleman Slotted rotors, for my C6Z saved me 9lbs per side on front and about 6lbs per side on the rear. I figure the Grandsport has 14” front and 13” rear too. I did weigh the rotors myself when I installed them.:thumbs:

As a long time user and dealer for Coleman rotors, and I have a few dozen or more in stock for TCE kits....I can tell you from experience; the DV32-1400 while lighter, is not going to be as durable as the Wilwood 14" Spec37 part.

The rotor construction is not the same and the total mass is not the same. Wilwood refers to the rotor as a 72 vane but even taking into account half of them are not fully engaged, the remaining part is a full 36. Pound for pound the Coleman parts are going to be about 5lbs lighter. But at the expense of durability.

Not picking sides here just sharing what I have found over 20+ years.

I use the car for autocross. I've had the rotors on the car for a full season which equates into about 130 +/- autocross runs which averaged about 60 seconds per lap. A lot of braking from 70 down to 30/40 mph and from 60+ down to 0 attached he end of the run. I'll take a picture of the rotors when I get home. I put about 386 miles on the car last year so about 350 of that was actual autocross runs.

My focus is autox so weight is my primary focus over longevity. If I did more track I probably would take durability into consideration as well. My Coleman rings did wear pretty quick and I use Hawk HP Plus pads. I was able to make it through the season on one set of rings.

Todd, if you don’t mind me asking, what is the torque value to use on the bolts that attach the rings to the hats? :thumbs:

Sounds good, was not looking for any confrontation on that info, just sharing.

The Wilwood 12pt ss bolt to hat is 155"lbs or roughly 12-13ft lbs.

Traded some emails with Mike Owen of Girodisc. For those keeping score, the Girodisc C6 Z/GS 14" front rotors (rotor/hat/hardware) are 18.9 lbs each. This is 7.6 lbs/side lighter than OEM.

I'm not hard on brakes. Not since my "balls to the walls" C4 days have I cracked a rotor....yet I still run very comfortably in the Red group with my basically stock 2013 GS.

Sooooo.....after pulling an all-nighter researching Girodisc (since my 3 month old wasn't interested in sleep I may as well start training him right). I'm going to give them a shot. The replacement rings are slightly more expensive than the Coleman rings but the upfront cost is slightly less. Even with 10-12 track days per year, I'm pretty confident I can get a year out of them.

With a little luck I'll have them here in time for a Dec 9th track day at Willow Springs. :thumbs:

I got an email from Wilwood this AM weight of 140-12496

Wilwood GT 72 Curved Vane Spec-37, 21.7 lb ea.
Wilwood GT Series Big Brake Short Offset hats 1.6 lb ea.

I can provide one data point confirming what Todd says in this post. When I had my C6Z I tried several different braking solutions including the Performance AFX Heavy Duty two piece rotors. They weren't cost effective when compared to the stock rotor since they would go about 7 days before cracking while a stock rotor could make about 5 days at far less than half the cost. However, the Wilwood 72 vane slotted rotor went at least 14 days and I replaced them because they were looking like I should replace them. I might have gotten another couple of days out of them if I had decided to push it. From a cost stand point they were still more expensive than the stock rotors from a cost per day standpoint but not that much more expensive. Considering I didn't have to change them as often and could get by without taking a pile of spares to the track it was worth it to pay the slightly higher consumable cost.

Bill

Good example of how driving style/"enthusiasm" can affect durability. I think I'm up to 15 or 16 events on my stock rotors and could likely get a couple more out of them.

:)
:cheers:

If anyone is interested, my rotors arrived yesterday from Girodisc. Saturday I’ll be at Willow Springs so I’ll know in short order if the lighter weight is noticeable as well as any changes to brake pedal feel since they’re floating rotors.


https://cimg8.ibsrv.net/gimg/www.cor...21b083391.jpeg

https://cimg9.ibsrv.net/gimg/www.cor...dd811d24a.jpeg

https://cimg0.ibsrv.net/gimg/www.cor...92e64d3e7.jpeg

https://cimg1.ibsrv.net/gimg/www.cor...0464f0def.jpeg

https://cimg2.ibsrv.net/gimg/www.cor...5d07a2d64.jpeg

The GiroDisc and hat look like a nice piece. Did they come assembled as well? Impressions?

They come assembled. They’re clearly marked left and right, well packaged, and inspected (attaching hardware and runout).

They installed exactly like the stock rotors with no fuss or “hidden” mods required.

On track I had excellent pedal feel and the nearly 16lbs of total weight reduction was noticeable which surprised me since. I can feel the difference with wheels and tires but wasn’t necessarily expecting it with rotors.

They held up well (no odd discoloration, cracks, etc). I expect long life out of them :)

It doesn't look like girodisc has rear rotors. Is that correct?