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991 to 911S Rotor Diameter.

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Old 12-21-2018, 08:48 PM
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dporsche74
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Default 991 to 911S Rotor Diameter.
MY CPO is over and I really want to install the 6 pot S calipers from the 991S onto my 3.4

Are these the stock OEM Rotor Sizes?

991 Base 3.4 is 350mm front and 350mm Rear


991S is 380mm Front and 350mm Rear still.

Can anyone confirm this 100%

thanks!
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Old 12-21-2018, 09:43 PM
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onedae
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I think you are wrong. Base is 330/330 front/ rear. S is 350/330 front/rear.
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Old 12-21-2018, 10:06 PM
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dporsche74
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Thanks for the clarification .. so rear rotors will work with just a caliper change then?

Turbo and GT3 are 380/380 ?
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Old 12-22-2018, 12:37 AM
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For the 991.1:

Base 330/330
S 340/330
S w/PCCBs 350/350

http://www.auto-brochures.com/makes/...20911_2015.pdf

For the 991.2:

Base 330/330
S 350/330
S w/PCCBs 410/390

http://www.auto-brochures.com/makes/...20911_2017.pdf
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Old 12-22-2018, 12:53 AM
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0302
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So if I’m reading this correctly, the rear rotors for a .1 S could be used on a .1 base? I’ve been having a hard time finding slotted rear Sebros for my base but can find them for an S. I’m wondering if this would be my solution. Sorry for the thread jack.
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Old 12-22-2018, 11:34 AM
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Originally Posted by 0302
So if I’m reading this correctly, the rear rotors for a .1 S could be used on a .1 base? I’ve been having a hard time finding slotted rear Sebros for my base but can find them for an S. I’m wondering if this would be my solution. Sorry for the thread jack.
yes, but you need to use “S” pads also which fits directly in the caliper. The only difference between the rear caliper on the base and on the S is the red paint.
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Old 12-22-2018, 12:38 PM
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0302
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Originally Posted by awrryan


yes, but you need to use “S” pads also which fits directly in the caliper. The only difference between the rear caliper on the base and on the S is the red paint.
what’s the difference between the rear pads?
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Old 12-22-2018, 01:11 PM
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awrryan
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Originally Posted by 0302


what’s the difference between the rear pads?
the size. Bigger to fit the bigger surface area of the disc.
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Old 12-22-2018, 01:53 PM
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Originally Posted by awrryan
the size. Bigger to fit the bigger surface area of the disc.
So even though the rotors are both 330mm, the surface area is different? Interesting. Will this cause any issues with ABS or any other nannies?
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Old 12-22-2018, 02:09 PM
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awrryan
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Originally Posted by 0302


So even though the rotors are both 330mm, the surface area is different? Interesting. Will this cause any issues with ABS or any other nannies?
yes. Same size but bigger surface area. No bad effects. Not with abs or anything else. Ask me what I did to the front? I put the Carrera S 6piston calipers with OEm gt3 brake pads and Girodisc rotors. A1-032 is a 350 mm rotor that doesn’t need a spacer for the caliper!
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Old 12-22-2018, 02:18 PM
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Sizes are different. I've converted before via the suncoast part and panted the rear calipers.

Now I traded my .1 3.4 for a .2 s, to be honest, save your money and don't go through the hassle.

Braking is not improved. Especially if you're just street driving. If you're tracking, change fluid and pads.
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Old 12-22-2018, 04:57 PM
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Originally Posted by s4one
Sizes are different. I've converted before via the suncoast part and panted the rear calipers.

Now I traded my .1 3.4 for a .2 s, to be honest, save your money and don't go through the hassle.

Braking is not improved. Especially if you're just street driving. If you're tracking, change fluid and pads.
probkem is, other than pagid, there’s not much of a choice for pads. Also, I went through the process for heat dissipation not just better braking performance. By virtue of having better heat dissipation, I think I did improve the braking even if stopping distance is about the same.
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Old 12-23-2018, 12:07 AM
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My memory may be playing tricks on me, but i thought there was a slight difference in the two 330 mm rotor thicknesses, like 2 or 4 mm. It's hard to find, but that is my recollection. Am i wrong? Or am i possibly thinking of rear rotors on other Porsches I've owned, like the Macan Turbo or 981 CS??
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Old 12-23-2018, 12:33 AM
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Originally Posted by PCA1983
My memory may be playing tricks on me, but i thought there was a slight difference in the two 330 mm rotor thicknesses, like 2 or 4 mm. It's hard to find, but that is my recollection. Am i wrong? Or am i possibly thinking of rear rotors on other Porsches I've owned, like the Macan Turbo or 981 CS??
On the Carrera S the Front rotors are 34mm & Rear rotors are 28mm in thickness.
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Old 12-23-2018, 01:43 AM
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Originally Posted by PCA1983
My memory may be playing tricks on me, but i thought there was a slight difference in the two 330 mm rotor thicknesses, like 2 or 4 mm. It's hard to find, but that is my recollection. Am i wrong? Or am i possibly thinking of rear rotors on other Porsches I've owned, like the Macan Turbo or 981 CS??
991.2 (991.1 in parentheses)
Carrera F: Ø 330 x 34 mm (Ø 330 x 28 mm)
Carrera R: Ø 330 x 34 mm (Ø 330 x 28 mm)
Carrera S F: Ø 350 x 34 mm (Ø 330 x 34 mm)
Carrera S R: Ø 330 x 34 mm (Ø 330 x 28 mm)

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