TRAKCAR

I just bought my first spare set of MKII brake rotors.

I still had some old rear rotors laying around and without actually trying to put them on, it seems that all the measurements are the same and they are exchangeable.

Has anyone actually tried putting them on? Can anyone confirm?

rmag

Peter - Since you have the car, and the old rotors ...give it a try and let us know, should only take about 30 minutes. I'm just about to order another set and prefer the cheaper alternative

TRAKCAR

Yes I know I know.... probably won't get to it until its time to do pads.

I still might prefer the new ones although 3x the price.
The new ones look much better made, less holes and with alu in the middle probably lighter.

I will weigh them to see if there is a difference is for you ;-)

TeamDrugMoney

Are you guys replacing with OEM or Brembo rotors? I am about to replace my SECOND set of front rotors and cannot see using drilled OEMs any more! The Brembo slotted are a bit more $ initial cost, but ultimately cheaper to run from what I hear. I was also told you get about 2X the life out of them.

Any thoughts?

TRAKCAR

OEM until someone make something cheaper that is slotted, but if real life use is 2x as long, maybe better Brembo..

What do you use in the rear?

CRex

I run brembo 72-vanes f&r (the funky curvy slotted ones) and love them. Absolutely on par with my OEM ceramics with the obvious exception of unsprung weight. Then again I ain't good enough to make use of a few lbs less in each corner.

The latest development appears to be gen 2 cup steel rotors--looks v similar to gen 2 gt3 steels except the hat is lighter aluminum (and silver not grey). Cheaper too--at half the price of brembos!

TRAKCAR

The OEM front rotors look to have aluminium hats also..

CRex

Indeed the oem steels have aluminum hats... But I had a chance to compare the stockers with gen 2 cup steels side by side this week and the motorsport parts definitely look different--hats almost a shiny silver. Appearances aside, I was told they shave a bit of weight. I'm looking for specs from the shop that sells them and will post when available.

CRex

Forgot to mention--key structural difference being a denser cross-drilled pattern over the steel stockers. Perhaps more efficient ventilation but that is just speculation.

TRAKCAR

Thank you!

TeamDrugMoney

Hey, these cup rotors you speak of, are they drilled or slotted? My biggest issue is the cracking you get from drilled. I would rather run slotted Brembo, unless these cup rotors have some kind of extended life thingey going on. I am not too much concerned about weight as I also am of your mindset that the car is not holding me back in any way and I'm trying to tighten up the nut behind the driving wheel!

CRex

I love GoogleImages!!

Both front rotors shown.

2009 GT3 Cup (not RSR) -- steel with up to four concentric rings of cross-drilled holes. Drilling concentrated around the center of the friction area.

2009 GT3 Street car -- steel with up to three concentric rings of holes. Outer holes much closer to edge of rotor. Also notice the darker hat color (I know this is not the best pic but trust me in person the difference is immediate)

Now why Porsche would drill the street discs that close to the edge is beyond me.

TeamDrugMoney

Hey!

Big thanks for posting the comparison. I am still at a loss of why to continue using OEM Drilled over the Brembo slotted. I guess giving them a try is the only thing to do at this point. Cha Ching goes the cash register!!!!!

P.J.S.

brembo type III is what you are looking for
as mentioned previously more up front cost but easily double the life

P.J.S.

like this