GT3 or Other 6 Pot Calipers on a C2

Has anyone successfully fitted the 996 GT3 / 997 Turbo 6 pot calipers to the front of a 996 C2, without changing the upright/knuckle? Is it possible to use an adapter? Has anyone done this? Do any other 6 pot calipers exist in the Porsche foodchain that can be made to work with the standard C2 knuckle? Any info appreciated!

Most any Brembo caliper should bolt right up I believe. I'm pretty sure (but not 100% confident) that the bolt spacing is standard on their calipers.

https://www.design911.co.uk/fu/prod1...C2S---997-C4S/

The challenge is that the front mounting centres are 130mm most callipers that have a 130mm centre are 4 pot. The Cayenne callipers Mount differently they are not radial, as such they need to be machined and have a bracket added to make them work. The adapter in the link is for cars that already have a larger calliper, the spacing is not 130mm and as such these would not work, however, this is the type of thing I am looking for. Keep the suggestions coming!!

I have been interested in this as well. The Macans come with the lighter weight 6 piston calipers that mount from the top and they are becoming pretty cheap on the used market. Apparently Brembo makes an adapter to put those calipers on, but they only are available as part of their “kit”. So it must be possible to make an adapter which spaces out the mounting holes and moves the caliper out for a larger rotor. The question is does someone else sell the adapter and if not can who is willing to be a test mule to make the adapters. I did this for my early 911 years back to mount boxster calipers and even offer to sell the sets, but there was not much interest so I dropped it. But between materials and machine time I had about $500 into the first 10 sets made. I think I could have sold a complete kit with hardware for about $150 per kit. Thoughts?

Subscribed - would love a 6 pot option for the C2! Something about the look and performance of a big set of brakes... mmmm

Guys, take a look at this http://www.911uk.com/viewtopic.php?t...493c7b95bccc5c Cayenne 6 pots can be made to work but it requires machining of the caliper and a bracket. The 997 turbo calipers (Same as on 996.2 GT3) are already radial mount, as are the 958 Turbo calipers, as are the Macan front 6 pots as identified by Quaz. In the Audi/VW/BMW work there are about a million caliper adapters that allow the mounting of what seem like virtually any caliper to any model, however there is very little in the Porsche world. Looking at the included thread I see no reason why a bracket/adapter cannot be made to fit to a 997/958/Macan 6 pot to a 996 C2, in the same way that a bracket has been made up to get the Cayenne 18Z caliper to fit a 996 once the lugs have been machined off. I was hoping someone had already made/identified something. Quaz, if you can make an adapter for a specific Porsche caliper to make this happen, I would be interested in purchasing.

I don’t mind going down this road, but it does take some time. This should be a little easier then last time I did it since I don’t have to engineer a rotor to fit either. What makes the process easiest is if everything can be take off the car and put on a bench for fitment and measuring. So I would need to acquire a hub spindle assembly (about $100 used), desired target rotor (probably $80-150), and a macan caliper ( $300). The aluminum for the the brackets is trivial (probably $200 for 10 sets), but then there is the design and machine time. I had a buddy do it last time and he only charged me a couple hundred dollars. So just for development of this I will be into for $1k. If there is some genuine interest or potential partners to chip in I am willing to go down this road again. Here are some pics of the kit I put together for early non-S air cooled 911s. I think had I done that kit 20 years ago everyone would have used it, but hot rodding early 911s has gone out the windows since they are now worth so much more put back together stock.

My 2001 has 997 GT3 calipers and rotors. Don't know how the PO did it but I'll go through the service records and see if I can figure it out. The car stops really well!

what are you hoping to achieve? Are your stock brakes boiling the fluid or are you unable to lock up the tires?

Out of curiosity when upgrading to larger brakes should the booster + master cylinder be upgraded as well? Or is it enough to just upgrade the calipers and rotors?

That is an it depends answer. I have not checked caliper piston total volume displacement from old to new calipers yet. If the total volume doesn't change much then it really isn't needed. However in general when going to a larger caliper piston volume it is helpful to increase the master cylinder size to reduce pedal travel. If you don't mind a slightly longer pedal travel then you don't necessarily have to upgrade the master cylinder. So for street driving it probably isn't necessary, but if you track the car then you will want the larger master cylinder for sure.

sorry, i missed the 's' on the listing i posted. i know it has been done but couldn't remember the name of the company. oddly, founding it again by searching 'cayenne brakes porsche 996'. go figgure. http://www.goingsuperfast.com/Porsche-996.html big $.

Yeah the Cayanne kit isn't overly desirable for a couple of reasons. First the calipers are very heavy, so you put quite a bit of unsprung weight on the front. They are meant for a truck. Second the pad size is not appreciably bigger than the standard C2 caliper pad. You can accomplish much of the same thing by just putting 330mm rotors with the stock calipers. The GT3/Macan 6pots have a much larger swept area and a pretty light weight caliper. Overall it just makes for a better solution. Not to mention you don't have to machine the calipers to make them fit, so off the shelf calipers will bolt right on. The ideal kit is a set of 350mm GT3 rotors, set of adapters and Macan calipers/pads. All bolt on and a true upgrade. Master cylinder is optional if you plan to track it. At least that is what I am thinking. I need to do some math on all this when I get some time maybe this weekend.

Thanks someone on here did write up installing a 997 GT3 master cylinder (I think). Looking forward to your calculations! Thanks

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FWIW, the 18z Cayenne caliper weighs 14.35 pounds. Not sure how that compares to stock calipers or the Macan calipers.

I can't verify the exact weight, but I can tell you those Cayenne calipers are massive and heavier than hell. At one point I had a set that I was going to install on an Audi S4, it was one of the trick upgrades that people were doing.

What size are the rear brakes C2 vs GT3?

Standard C2 discs are 317mm Front, 298mm rear. I currently run Giro which are 340mm front, 325mm Rear. 996.1 GT3 runs 330mm Front & Rear. I agree with Quaz in that I feel 350mm is the sweet spot, based on performance and adding unsprung weight. - As already pointed out the weight of the Cayenne caliper is what has pushed me away from this solution. Caliper choice also has to have a good selection of quality pads available, no point fitting a large caliper only to find there are no pads available, I currently run Pagid RS29. Quadcammer, for fast road use the standard setup is more than adequate, add high temp fluid, good pads and 997 GT3 ducts and you have a solid setup, indeed on track, with Yoko AD08R or Michelin Cup2 I can bring the ABS in, so there is definitely enough power in the standard calipers, however it the heat management after prolonged use I am looking to improve. - And although a secondary point, I dig the look of the 6 pots. You will need a larger 27mm 997 GT3 master cylinder one to give better pedal feel and be able push the extra fluid required by the larger front brakes. Quaz, are you able to get the 996 GT3 6 pots to work with a bracket or do you feel the Macan calipers are a better way to go? - And which Macan 6 pots are you thinking of? Are they all the same? My concern with the 996 GT3 is that the mount hole centres are circa 145mm, so only maginally bigger than the C2 130mm which may make fashioning an adapter difficult.

going superfast has a 997 turbo kit on the same page previously linked. still big $. if you are looking for cooling, that's the rotors not the calipers. you can get larger rotors and keep the same calipers with spacers and longer caliper bolts (or go to studs). adds more clamping via the longer lever arm on the rotor as well. girodisc does it and gets you lighter rotors as a bonus, or i am pretty certain some research will find you oem rotors that are larger diameter but same width/offset and you just need to fabricate the spacers. but really, no need to justify; if you want 6-pot then good luck, but not sure you will find a solution - "strong, light or cheap, pick two."

I already run Giro Discs, front and rear, in addition to 997 GT3 front lower ducts & front upper ducts with modified rad cowls to allow the air to run through the rads and into the wheel well, as well as custom brake ducting from the front bumper to the front calipers. - Rear runs 997 GT3 ducts.

Good old RockAuto always has specs of calipers and rotors posted, gotta love it. Anyway, the Macan GTS and Turbo calipers seem to be the same, but depending on year they spec 350-370mm rotors. ????? So I will have to dig into that a bit more. The bolt hole spacing is 205mm compared to the 145mm of the GT3 caliper and the 130mm for the standard Carrera. This is significant because there should be enough room to actually make the adapter and not modify the caliper as they do to fit the turbo/GT3/Cayanne units. I have seen the GT3 kit and it is pretty hokey in my opinion. Then comes the pistons, they are 36/36/36 compared to 44/36. This is where I need to crunch some numbers and see how much that will screw up the bias and pedal travel. Pretty sure the Macan caliper is the way to go here though. I am on the road for the next couple of days so I can research more when I get back home.

I have a set of 997.2 turbo 6 piston calipers that are bare for 500 if anyone is interested.

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36mm x3 = 3054 square mm of piston, 36mm + 44mm = 2538 square mm of piston area

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Any updates on that? I would like to mount this setup on my C2 Targa, but don�t know which parts I have to get and if there are some Adapters available?

Cheers! For those who are interested I created an adapter set to fit 380mm 6Pot caliper/discs to our 986/996s using only the adapter and other OEM parts. Works fine! High strength steel adapters to fit 380mm discs and 6 pot 997.2 GT2/3/RS with 225mm distance to 130mm 996/986 wheel carriers. These are made out of the same steel as Epytec is using for the german certificated brake adapter kits and are additionally coated. The adapters allow usage of Cayman GT4 discs which benefits in a much cheaper price compared to 997 GT3 steel discs (997 GT3 steel discs have also a bigger bore hub than the 996s) and improve the brake clearance by ~2mm. By this more wheels or less thick spacers can be used to fit the wheels. Additionally using this adapters allows OEM only usage of bolts and brake lines. No aftermarket parts are required. (e.g. OEM bolts used in 997s with the OEM adapters are used to fit these adapters, OEM hard brake lines are used attaching to the same holder and the OEM 996 brake lines) Road tested in Germany up to 300km/h for some time now.

Hey all...this may go a little OT on the 6-pot question, but I've been looking at BBK upgrades too and balancing against rebuilding my OEM brakes with stainless pistons and hi-temp boots vs a StopTech or Brembo BBK. I'm pretty sure both make 4-pot and 6-pot options although I was mainly looking at the 4-pots. Until, that is, I spoke with Stoptech and learned that their ST-40 based BBK for the 996 uses 34/38 pistons up front. So...essentailly their $2K BBK "upgrade" is really a downgrade in terms of piston size and brake fluid volume. Seemed Strange to me!! Has anybody run any of the below options and have real butt dyno experience with the results? I've heard a thousand times here even from heavy track guys that the OEM gear is more than enough for the track 90% of the time. Is there a way to get to 95% without breaking the bank? - Upgraded OEM calipers with Stainless Steel pistons and a high grade 600 deg brake fluid (SRF, Motul. StopTech) - StopTech or Brembo BBK kits, preferably 4-pot versions due to budget. - Either of the above with a 997 GT3 Master Cylinder. I know Kickshu and someone else tried this and I think it finally worked without ABS lights with a proportioning valve. Pretty sure there's also a way to move the front OEM calipers to the rear, so if you can increase front piston volume you can retain a stock-ish 60/40 F/R ratio.

https://rennlist.com/forums/996-foru...e-upgrade.html

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Works as well! Everyone has his preferences regarding discs, material and OEM part usage..

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with those mods and a good pad, your brakes should be outstanding.

I've got a 2001 Aero that a previous owner put full 997 GT3 suspension and brakes on. I cant say I know exactly how he did the brakes but I was looking at the fronts yesterday and there are no adaptors so I am guessing that knuckles/hubs/uprights must be all GT3. My car has very minimal options and so weighs less than 3000lb. It stops breathtakingly well and never seems to need the ABS.