PCA1983

Is that a 991.2 GTS pad you are talking about? Which would be the same size as the S pad...

Sidvicious7

For clarification I installed a low dust brake pad. The brand I installed is the Carbotech pads Mfr. Part # CT1741-1521 (Front Pads). The second set of numbers (1521) signify street pads. The width of the OEM vs the Carbo pads are the same. The difference is the height of the pad (not thickness) that makes up for the additional 10mm diameter increase in the rotor (OEM 340mm to Gyro 350mm). When I was conducting my research I was informed by Gyrodisc the GT3 pad would fit perfectly on my rotors. Plus I was also informed the OEM front pads will work just fine with the Gyrodisc front rotors. The rear pads are unchanged.

I own a 2014 991.1 50th model. The brake pads for a GT3 fit perfectly on my six piston front calipers with the two piece Gyrodisc 350mm rotors. The increase in rotor size by 10mm diameter (340mm to 350mm) is the governing factor that allows one to upgrade brake pads from a CS to GT3. I recommend you call Gyrodisc and ask to speak to their Porsche or technical support department.

MikeGirodisc

Just thought I would pop in here and clarify a few things. We actually have two different rotor options for the front of the 991.1 S/GTS. The p/n on we website A1-122 is specific to the 991.1 and the OEM brake pads. The rotor does increase the diameter to 350mm and includes the necessary spacers and bolts to accommodate the increase in diameter for a 100% plug and play solution.

Alternatively we also offer an option to run our p/n A1-032 which has a taller swept area and allows the use of the taller GT3 brake pad shape as Sidvicious7 did with his vehicle. This opens up pad options a bit and increases the mass of the disc which provides some additional thermal capacity. The A1-032 p/n is also 350mm however it does not require spacers because the taller pads accommodate for the increase in diameter. This is exactly what Porsche did on the 991.2, that car uses the same caliper and upright as the 991.1 however it utilizes a larger 350mm rotor and the taller brake pad.

Hope that clears things up!

Sidvicious7

Thanks for your input Mike.

rubenhak

Thanks for info. Does that make A1-032 slightly heavier than A1-122? Also, on the web site it says that A1-032 is made for 996 and there is no mention of 991.

How would one choose A1-032 vs A1-122 for 991.1S? Is it just based on preference of using spacers vs no spacers?

rubenhak

Thanks! Is it fair to assume Carotech pads perform as good as oem?

Sidvicious7

I have noticed the more miles on put my vehicle and applied my brakes under normal street and highway driving the better the pads grab. So the difference in performance is very close. There is also a big plus to these pads; they give off virtually almost no dust. When my vehicle had the OEM pads a quick drive around the block on freshly washed wheels they end result was a set of dusty rims. Lastly, I bedded the rotors and pads following the manufacturer’s recommendations where I have zero squeaking.

rubenhak

That's definitely important for most of us. Did you follow GiroDisc or Carotech bedding instructions?

Also, didn't you have luck in finding low dust rear pads?

Sidvicious7

Memory serves me I believe I followed the pads bedding instructions. I’m also using CarboTech rear pads and I’m extremely happy how they perform and I love that they emit almost zero dust. The lowest brake dust output in my opinion are carbon ceramic brakes. When comparing dust output with iron rotors on OEM pads vs CarboTech pads it’s 98% to 2% difference; and the drums on my wheels are finished in a high gloss black which has a tendency to amplify dust & dirt.

ShaunP

Yes! Thank you. This is exactly the information I was looking for.

rubenhak

Got it. by any chance do you have the part # for rear pads? would it be CT1417-1521?

mgordon18

OP: No one on this thread actually answered your question about whether the Girodiscs are "worth it," but I'll give you a hint: they're not. Particularly if you're not tracking your car very often.

You can buy 3 sets of OEM rotors and 5-6 sets of aftermarket slotted rotors for the price of one set of Girodiscs. Will the Girodiscs last 3x-6x longer? I doubt it. Do the Girodiscs stop your car any faster? My car gets into ABS real quick when I stomp on the brakes, on track @140mph or on the street @65mph.

Are they cool? Sure. Will the .00001% of people who care/notice be impressed? Possibly. Will YOU be happier knowing they're on there? Maybe. But are they worth it? I don't think so.

Edit: Bad math - Girodiscs are $2400 all around, OEM are $850, and aftermarket slotteds are $625. So you can get almost 3 sets of OEM and almost 4 sets of aftermarket. Granted, the Girodiscs are 2-piece rotors, so you wouldn't have to re-buy the hats, only the rings. But the rings alone are still $1600 for a full set of 4.

LargePuppy

Thank you for your review, this was the real world review I was looking for

B Russ

Part of the CPO on my car was new front rotors, Can I add Carbotech pads now after 1000 miles of use? Im tired of the car puking break dust. Its a 17 4S which ones would I get

The Fat Kid

Track rotors and low-dust pads? I hope you do not intend to run those pads on the track because low/no-dust pads will literally explode, hence manufacturers' explicit warnings.

+1. They are "Race Inspired Cosmetic Enhancements" for most people...