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Might look into the 997 350mm rotors as an option. I am replacing my worn rotors with the larger diameter ones. All you need is a 11mm spacer and 997 caliper bolts. Cheap upgrade if you are already in need of rotors.
Just to update after along conversation with Kevin @ UMW I'm going with Porsche 997tt 350mm rotors all around with 12mm caliper spacers. Thanks for all the great input!
Have you run any rotor that doesn't crack under heavy use? Normal occurrence from my experience.
I've had drilled OE 996 turbo, OE 997 GT3's, Stoptech, and slotted Sebro crack.
By crack, I mean hairline fractures between the holes/on the pad surface.
As long as the cracks are not on the edge or connecting holes, you're fine.
Porsche has some guideline about crack length/replacement based on, if I remember correctly.
Have you run any rotor that doesn't crack under heavy use? Normal occurrence from my experience.
I've had drilled OE 996 turbo, OE 997 GT3's, Stoptech, and slotted Sebro crack.
By crack, I mean hairline fractures between the holes/on the pad surface.
As long as the cracks are not on the edge or connecting holes, you're fine.
Porsche has some guideline about crack length/replacement based on, if I remember correctly.
since the sebro slotted doesnt have any holes it would be hard to see cracks between the holes. basically its a solid rotor with a cleaner effect. its also typically cheaper than oem
since the sebro slotted doesnt have any holes it would be hard to see cracks between the holes. basically its a solid rotor with a cleaner effect. its also typically cheaper than oem
They'll develop cracks real similar to the one with holes from my experience.
Have you gotten substantially longer life out of the 2 piece rotors and/or pads? Enough to justify the ~3x price difference per rotor (excluding the cost of the hats)?
Coming back to the Sebros, I'm wondering if maybe I installed them backwards and that's why I cooked the pads. This image from Girodisk says that theirs should be installed in a way that seems counterintuitive. Are Sebros the same?
Have you gotten substantially longer life out of the 2 piece rotors and/or pads? Enough to justify the ~3x price difference per rotor (excluding the cost of the hats)?
Coming back to the Sebros, I'm wondering if maybe I installed them backwards and that's why I cooked the pads. This image from Girodisk says that theirs should be installed in a way that seems counterintuitive. Are Sebros the same?
Using two piece rotors makes no difference in my experience.
And yes, the rotors must be mounted on the correct side of the car. There are different part numbers for right and left.
Have you gotten substantially longer life out of the 2 piece rotors and/or pads? Enough to justify the ~3x price difference per rotor (excluding the cost of the hats)?
Coming back to the Sebros, I'm wondering if maybe I installed them backwards and that's why I cooked the pads. This image from Girodisk says that theirs should be installed in a way that seems counterintuitive. Are Sebros the same?
The orientation of the rotor internal cooling vanes are what drives the rotor location. The external slots do not.
I never ran the OEM cross drilled rotors. With that said, the metallurgy of the OEM cross drilled rotors seems pretty good. I know some very fast guys that track the stock rotors and get good life out of them on GT3s with proper brake cooling ducts. I'm running the slotted 350 Sebros on my Cayenne and they seem a bit "soft" as the wear rate seem rather high. Nothing scientific but that's my impression on those. Unless you're heavily tracking your car, the OEM rotors are more than you will ever need.
I'm not sure if the slotted 2 piece rotors last longer. I get about 15 track days on a set of front 380s, about 25 on a set of rears. Basically 2-3 set of pads to a set of rotors. The longest lasting rotors I've ever used are the AP racing 72 vane 380/350 race rotors. The are fully floating (both radially and axially) and allow for full expansion of the rotor surface thus reducing stress that leads to cracking. These are my rotors of choice. The latest version of Girodisc rotors are also excellent and at an attractive price point. The float axially and the 380 are 72 vane while the 350s are 48 vane.
The biggest draw of the 2 piece rotors is the reduced weight saving about 5-10lbs per corner. They will also greatly reduce heat transfer to the hubs and bearings. All a big plus when tracking the car..
Warehouse33auto.com is about 13% cheaper across the board on the exact same brake pads. AND that is before the additional 10% discount that Jason gives you for using the promo code RENNLIST at checkout. Nearly every time I shop parts prices, I've found warehouse33auto.com's parts prices to be cheaper BEFORE the RENNLIST promo code discount.
Jason is a Kansas City guy and I met him through Rennlist. Although we certainly aren't close friends, I know him well enough to say that he's a great guy, honest, hard-working, attentive to customer service and a dyed-in-the-wool auto enthusiast. I'm not sure what else you can ask for in a vendor. I like Pelican also, and I even have one of their stickers on my lift. But my first stop for parts shopping is Warehouse33auto.com. I hope you guys develop that habit also - he deserves our support.
Warehouse33auto.com is about 13% cheaper across the board on the exact same brake pads. AND that is before the additional 10% discount that Jason gives you for using the promo code RENNLIST at checkout. Nearly every time I shop parts prices, I've found warehouse33auto.com's parts prices to be cheaper BEFORE the RENNLIST promo code discount.
Jason is a Kansas City guy and I met him through Rennlist. Although we certainly aren't close friends, I know him well enough to say that he's a great guy, honest, hard-working, attentive to customer service and a dyed-in-the-wool auto enthusiast. I'm not sure what else you can ask for in a vendor. I like Pelican also, and I even have one of their stickers on my lift. But my first stop for parts shopping is Warehouse33auto.com. I hope you guys develop that habit also - he deserves our support.
You are correct. I will add Warehouse33 as a parts source from now on.
01-11-2017, 01:50 AM
