Brake upgrade to GT-3 stuff

I'm trying to get a quick poll on upgrading the 996 brakes to the factory GT-3 calipers and rotors. I'm working on a fairly quick and simple up grade procedure. Any interest out there for this? pm me

bump, just in case

I'd be interested in a procedure with pictures. Could you email it to me when you've got it?

What would be the unsprung weight difference?

It's not a simple upgrade as they don't just bolt right up. It would be easier and more cost effective to do something like a Stoptech or Brembo upgrade kit. With that said, the CHEAPEST way to go about this and one you will be very happy with is to just upgrade the pads (sport pads for the street and race pads for the track). It amazes me the number of people that don't realize just how potent the braking system is on these cars. So, I have to ask......why do you want to "upgrade" your brakes?

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+1...couldn't agree more!!

Dell's Back!!! and he's right. unless you've got access to salvage parts there are better more cost effective ways to upgrade the brakes. To do the GT3 brakes you also need the GT3 uprights...and then your stock sway's probably won't bolt up so you're gonna need GT3 sways too. AND if you're going that far you might as well do 997 GT3 or GT3RS uprights as the geometry on them is even better than on the 996 uprights for lowered cars. However, Cup car brake ducts, track pads and quality fluids are all I've ever needed though to keep my stock brakes happy at the track. Andy

I think you guys are missing the point. The GT-3 set-up with the larger diameter rotors and huge calipers would give the 996 superior stopping power. We plan to make two small adaptors to adapt the GT-3 caliper to the STOCK 996 upright. There are few other mods to get the job done but, In GT-B where you CAN NOT change the upright this would be huge.

Hence the reason I asked the question "why"? So, no, we did not miss the point. By the way, the adapter is the way you would have to go since you are not allowed to change the suspension in GTB (except lower control arms and toe links). With that said, I would rec'd going with a Brembo or Stoptech system that is designed for your car not the GT3 6 pots.

Maybe not you LVDell. ok so I should have explained why. I did to the p.m.s just forgot to on the open forum. The 996 brakes and 996 Turbo brakes are great but you won't out brake a 2850lb GT-B car with GT-3 brakes in a real race situation. That's our reason for the R&D Bill Rudtner

Bill, that makes more sense. Racing is a whole 'nother animal If you decide on that route, then you can move the front calipers to the rear, install the front GT3 calipers (with adapters) and you should be fine. Is the Stoptech or Brembo, or similar, not a cheaper option (OR EASIER)?

Fair enough. So what will your adapters cost assuming we source our own parts otherwise?

I welcome the idea. I have been frustrated in the past whenever I saw an reasonably priced set of cast off 6 piston calipers available. An adapter is a great idea for a ton of different applications. I am not 100% sure that I need bigger calipers and can address any braking issues with simply more cooling. Keep us posted on this.

Proper cooling and pads would do wonders on the car without having to do the 6 pots. What year and engine do you have?

03 3.6 a little OT? Dell, I run fresh SRF and PFC01 but use the GT3RS Street ducts ( I know)

Not you Paul, the OP!

Duh

Its all about the costs... a few options out there for bigger setup. Anymore details regarding what is included in your setup?... calipers, rotors, adapters, bolts... weight?

We are still going through the R&D stages of this. We plan to use either.. Stock GT-3 rotors, cup rotors, cayanne rotors or if the urge strikes you, Alcon rotors w/ aluminum hats (pricy). There will be some small hardware and machining of the calipers will be required. Bill Rudtner

ahhhhh, I see. Please post some pics and keep us posted! Another thing, does the master cylinder needs replacing for the gt3 setup??

I think to get the full braking power the answer is yes but, we are going to try it with the stock 996 cyl first

All of the ex Koni cars came with 17in wheels. Im desperatley trying to find a better then stock set up that will work within them. I have 4 sets of wheels and 8 sets of tires and Im not about to sell all that to go to 18s. Any thoughts on this??? Tim

I have 17"s on a Koni car and my Fronts are 12.75" Diameter Slotted Rotors with Floating hats. Still not enought seat-time to give a proper opinion on this set-up... But it seams good!

Dave, are you going to be at VIR this weekend? I need to check out the new ride!

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No not this weekend.. I'm out of town. But I will be there July 1-2. I'm rooming with Tucker. Are you still stopping by for that?

Cool. I'll see you then. I wrap up at the college around 1p and then will head up to VIR to meet up with y'all for drinks and dinner.

update: the R&D for a GT3 adaptor kit to fit 996 uprights has about terminated (finally) and we are trying to test a set in March. Stay tuned..........

Pads and fluid are all you will need on a 996 in 99% of every 996 which sees track use. Please don't waste yer money.

i did stop tech brake lines and pads,also upgraded fluid and gt3 brake ducts,and i noticed the difference at de events.......

The GT3 Front Brake bolt-on kit is finally available and was mounted to my Koni car (well, now ex-car but still in the family) last week. WOW! Kit include all adaptors and new machined FRONT GT3 calipers. In other words, stock 996 FRONT uprights with GT3 brakes using any type of GT3 rotor and any type of GT3 brake pad. If you are interested, contact por29 in regards. Here are some pics of the install.

GT-3 front calipers on stock 996 front uprights.

I've got a car here with the new set-up on it now. I'll fit some 17" wheels and check fitment

Man, that is pretty! Nice kit.

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"WOW" as in it looks pretty, or there is some measurable positive performance difference over what a stock setup affords?

from stock 4 piston relatively small calipers to GT3 6-piston monsters? OH YES, there is a difference. The GT3 pads are almost twice as big!

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I know they're bigger ... I'm just wondering if one can obtain better lap times in a 30 minute sprint race, be immune from "ice mode" that's been reported when running larger brake calipers on a 996 with stock (non-motorsport ABS), difference in modulation and rate of pad wear/changes over a certain number of races, and of course that weight difference... you know, those kind of things. Did this get tested on a 996 C2 with the "street ABS" system? I don't know if the Koni cars had the motorsports ABS or not... but I know my C2 doesn't have it!

Sorry, my response was, to my fault, a bit flippent. Correct, bigger is not always better. Yes, I have experience the "ice mode" on a boxster I raced....very unsettling until you get accustomed to the brake threshold point. I will let Bill Rudtner field the ABS unit question as I do not remember what ABS unit is in the car now. I know the Motorsports unit failed after the first season I drove the car, 1/3 of which was with stock 996 brakes. At that point we installed a used stock 996 ABS unit (cheaper). The other 2/3 were with a Brembo 4-Piston Big Brake kit and stock ABS unit and I was MUCH faster with this set up. It is worth noting that the Koni car came with an ABS on/off switch. So, after the upgrade to the GT3 brakes, it is even better. I have not raced them yet back to back but the new owner sure will and the reports are already excellent from the first couple of DE events in terms of braking distance reduction. The weight difference for racing is not that much. In GTB1 with an X51 the car was 3100lb (with ballast) and an I-class 996 car is 3060. This also applies to the brake wear question.

GT3 pads - 10 lbs per set. 996 front - 5 lbs per set ;-)

there, verified they were twice as big (and as heavy)..... now the new owner can remove 10 pounds of ballast!

Cost ?

With those calipers...NO trouble in THE hottest of days and THE hardest of use. Zero. Just use Pagid Yellows -

Can you inform after all , what we need to do this conversion? I have the front 996 GT3 calipers, rotors and pads. So what I need to use this stuff in my 996 C2 2000? Thanks

Is there any update on the status or results of this brake mod ?

The kit was originally fabricated to allow the use of big brakes on the 996 type uprights staying within the rules of the GT-B1 class for PCA racing. The deal we made with the supplier is the calipers have to be bought new through them. The calipers come machined. the kit comes with the caliper mounting hardware and new calipers. This kit allows the use of Factory GT-3 350mm rotors or any similar aftermarket. p.m. me for any other information.

How about a version of this kit but for Turbo caliper and turbo rotors or gt3 rotors? I don't think you would need to machine the calipers then, only need the bolts and the distance plate?

So I started making my own version, 350mm rotors with turbo caliper, this is just a mockup for dimensioning. (stock upright) when the caliper bracket is done, I plan to make rotors with alu center

And finished, working very good just driven it 100km , but the initial brake is much better next project floating disc

How are you combating the increased front brake bias with this setup? Did you increase the rear rotor size?

No, didn't change anything, read a massive thread which i can't find at the moment, a british guy who has testet all combinations on the track, and 350+ turbo calipers was no problem with everything else stock. He finally used gt3 calipers, and moved the front calipers back, and added a gt3 master cyl.

Hi, old thread but hoping for a reply. I would love to get one of the C2:GT3 brake upgrade kits that you put together, are they still available? I am in the UK but can arrange shipping.

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is it somewhere available?

I forwarded your request to Bill Rudtner @ Rudtner's Southshore Performance aka Rudtner's Racing Good luck!

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Thank you, I would really love to mount the kit here in Germany. If you hand me out an email address I could contact him directly.

sent pm

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i know i know..im bumping an old thread.. anyone still have info on where to get these brackets?

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Cant really help but i would say its a waste if money. U can get 997 gt3 adaptors so u dont have to machine the caliper and the piston ratios (bias) r much better.

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Your other option if you got a little time and want a perfect fit is to look for a used Bembo GT Big Brake Kit (355f and 345r) on the Rennlist Marketplace or Ebay that is made for the 996. They come up for sale every now and then and well worth the money spent.