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Thanks, looks like the ebay listings are from the same guy as well.
I'm just wondering if the same size spacers that are being used for the rear will push the caliper out too far from the rotor when used in the front. The 996/997 rotors are 330mm front and back, so you can use the same size spacers in each corner. On the 991, since it's 330mm going to 350mm in the rear, but it's 340mm going to 350mm in the front, wouldn't 12mm spacers create a wider gap for the front between caliper and rotor? Or are the 997TT rotor dimensions the same as the 991.2 350mm rotors in that the hat area is sized appropriately so that you don't even need to use a spacer up front. and you can run GT3 pads to account for the increased disk area?
Great question, working on an answer
Can anyone with the Essex or Girdodisc front 350mm kit answer this question? How thick are the spacers, 6mm or 12mm?
Also just saw Brembo dropped these new rotors. Look pretty sweet for a one piece.
From what I can tell, we might not need to use caliper spacer in front to run the 997 Turbo front rotor / GT3 pad. I can confirm on the GD kits it isn't necessary, but their hat might be different size.
Endless MX72Plus F&R pads ordered from Japan. Went with GT3 front (EIP240) and 991.1 rear (EIP215), $604 shipped. Expecting them around first week of May.
Last edited by AdamSanta85; 03-30-2021 at 02:54 PM.
From what I can tell, we might not need to use caliper spacer in front to run the 997 Turbo front rotor / GT3 pad. I can confirm on the GD kits it isn't necessary, but their hat might be different size.
I posted this on the Essex/AP thread, but i didnt need front spacers on my 991.1 W/ GT3 Pads and the 350mm Essex kit.
They are 6mm BTW.
I posted this on the Essex/AP thread, but i didnt need front spacers on my 991.1 W/ GT3 Pads and the 350mm Essex kit.
They are 6mm BTW.
Thanks for that. Looks like I will have to have the spacers I am getting machined down from 10mm to 6mm if I need them. I guess that depends on the hat size of the Front 997 TT Sebro's vs the hat size of the stock 991.1 hat.
From what I can see on GD's kit, they have the 997 TT hat which works and is smaller than the 991 hat, no spacer vs the 991 size hat that requires the 6mm spacer.
I haven't ordered the rotors just yet.
Last edited by AdamSanta85; 03-30-2021 at 02:55 PM.
Thanks for that. Looks like I will have to have the spacers I am getting machined down from 10mm to 6mm if I need them. I guess that depends on the hat size of the Front 997 TT Sebro's vs the hat size of the stock 991.1 hat.
From what I can see on GD's kit, they have the 997 TT hat which works and is smaller than the 991 hat, no spacer vs the 991 size hat that requires the 6mm spacer.
I haven't ordered the rotors just yet.
confirmed on girodisc 997 350mm rotors for the front c2s calipers and not needing spacers. The hats are smaller . It’s what my car has on it. Only know because of the previous owner doing his research and finding this out.
Just ordered a set of Sebro slotted 997 Turbo front rotors to take some measurements with to see if I will need to use spacers or not. Hoping the hat size matches up with the aftermarket Essex/GD hats. I expect it will.
If the fronts work out, I will have an extra set of rear spacers and bolts available if someone with a 991.2 or 991.1 wants to go 350mm rear.
First track day of season is on MDW so need to have everything figured out when the pads arrive.
Last edited by AdamSanta85; 03-31-2021 at 11:56 AM.
Thanks. I will have an update when the spacers and rotors arrive next week sometime. I am going to take measurements and do some test fitting.
Unfortunately I won't have the GT3 size front pads to test with but at least we will know whether we need the 5/6mm spacer in front or not, with the one piece 997 rotor. I will have the 10mm spacers, and I will make up some temp 6mm spacers with nylon or some washers or something just to get an idea. My hope is that I measure the 997 Sebro hat and it is >= 10mm smaller than the 991 hat. That will answer the question quickly.
Looking back at the spacer vendors photos of the front brakes versus @mic_crispy Essex setup, to me, it looks like the caliper is sitting too far out, whether or not it should be .2" (5mm) or .4" (10mm) will shall see.
991.1, 997 Turbo one piece rotor, 10mm spacer, what appears to be stock size 991 pad
@mic_crispy 991.1, Essex/AP two piece rotor, no spacer, GT3 (wider) brake pad
Last edited by AdamSanta85; 04-01-2021 at 11:32 AM.
Sebro slotted rotors have arrived. Beefy. Made in Germany. Nice.
Spacers won't be here til Monday so I won't be able to pull it apart, however I took some measurements and gave this some thought....
997 TURBO SEBRO
Overall diameter of rotor 350mm
Rotor swept area (where pad can touch) 68mm
Gap between bottom of rotor swept area and hat 4mm (in front)
Gap between rotor (measured from back of rotor) 214mm
OEM 991.1 C2S ROTOR - Measured with wheel on
Swept area approx 55mm
Gap between bottom of rotor swept area and hat 16mm (in front)
So, even though the 997TT rotors are only 10mm bigger in diameter, we are gaining 26mm in swept area ((68-55)*2).... this is promising.
What I am thinking is we will know if we need spacers in front on Sebro by knowing the swept area of the rotors @mic_crispy is running. If they are about 68mm, we should be good to go. @mic_crispy would it be possible to measure your swept area quick? Should be possible without taking the wheel or of anything, just use a piece of paper, make a couple marks, then measure the paper on a table. I can tell from the Essex site that the actual disc part number for the 991 kit and the 997TT kit is the same.
If the AP swept area is > 68mm than we will probably need spacers with the Sebro.
Also just for the hell of it, anyone with a 991.2 >= C2S measure their rotor swept area?
Last edited by AdamSanta85; 04-02-2021 at 01:23 PM.
Sebro slotted rotors have arrived. Beefy. Made in Germany. Nice.
Spacers won't be here til Monday so I won't be able to pull it apart, however I took some measurements and gave this some thought....
997 TURBO SEBRO
Overall diameter of rotor 350mm
Rotor swept area (where pad can touch) 68mm
Gap between bottom of rotor swept area and hat 4mm (in front)
Gap between rotor (measured from back of rotor) 214mm
OEM 991.1 C2S ROTOR - Measured with wheel on
Swept area approx 55mm
Gap between bottom of rotor swept area and hat 16mm (in front)
So, even though the 997TT rotors are only 10mm bigger in diameter, we are gaining 26mm in swept area ((68-55)*2).... this is promising.
What I am thinking is we will know if we need spacers in front on Sebro by knowing the swept area of the rotors @mic_crispy is running. If they are about 68mm, we should be good to go. @mic_crispy would it be possible to measure your swept area quick? Should be possible without taking the wheel or of anything, just use a piece of paper, make a couple marks, then measure the paper on a table. I can tell from the Essex site that the actual disc part number for the 991 kit and the 997TT kit is the same.
If the AP swept area is > 68mm than we will probably need spacers with the Sebro.
Also just for the hell of it, anyone with a 991.2 >= C2S measure their rotor swept area?
Thanks for the research and data so far. I did some digging and found a thread from last year where someone replaced rotors with the same Sebro slotted 997 Turbo version on their 991.2. Comparing the photos in that thread here https://rennlist.com/forums/991/1156...l#post16075051, especially to the photo you attached from the spacer vendor, it does look like the caliper is sitting further out than needed. His caliper after the rotor swap sits much closer to the rotor hat. He also specifically mentions needing spacers in order to fit the 350mm in the rear, otherwise he'd have to stick with 330mm. So it looks like spacers won't be needed for the front, but it wouldn't hurt to get some measurements to confirm.
While I am not 100%, I bet D66 means 66mm swept area. If I was a betting man, I would say we are in the money. Hopefully a AP customer and a 991.2 owner can help us confirm my suspicions.
Thanks for the research and data so far. I did some digging and found a thread from last year where someone replaced rotors with the same Sebro slotted 997 Turbo version on their 991.2. Comparing the photos in that thread here https://rennlist.com/forums/991/1156...l#post16075051, especially to the photo you attached from the spacer vendor, it does look like the caliper is sitting further out than needed. His caliper after the rotor swap sits much closer to the rotor hat. He also specifically mentions needing spacers in order to fit the 350mm in the rear, otherwise he'd have to stick with 330mm. So it looks like spacers won't be needed for the front, but it wouldn't hurt to get some measurements to confirm.
Awesome, thanks for the help. I think we are pretty much confirmed at this point, short of me bolting it on my car. Damn I wish my pads were here.... I ordered some VHT satin black brake paint today so I can paint the rotor hats, not a fan of that grey...
I thought I read the rotor depth or something was different between 991.1 and 991.2, but that probably wasn't right. I feel like a lot of real parts data for Porsche gets cloudy because vendors charge big bucks for Porsche parts and educated consumers means less profits. They have people buying two piece rotor upgrades (sometimes) for the size increase, when really the consumer could get away with one piece rotors and a pair of spacers.
Anyway it sounds like I am going to have two sets of rear spacers and bolts now, so if someone with a 991.1/2 wants to go rear 350mm rotors, shoot me a PM... I paid $115 shipped so, lets say $65 (50% + $10 shipping) shipped.
Last edited by AdamSanta85; 04-02-2021 at 04:26 PM.
03-25-2021, 02:02 PM
