http://www.genuinesaab.com/catalog/p...roducts_id=692

I have seen these in person and they look nice.

 

According to two different sources they can reduce braking distance by as much as 20% and heat buildup that can warp rotors by 40% Of course they will be more effective at high speeds and multiple stops but even during the course of a normal days drive sometimes it is necessary to panic brake and they would help there too. Basically all you are doing while braking is converting the cars kinetic energy to heat energy in the brake pads and rotors. The faster that heat can be built up and then dissipated the faster the car will stop period. Drilled rotors will dissipate heat much better than a regular rotor because the hot gases generated during hard braking will escape through the holes and into the vents. with conventional rotors the hot gases produced during hard stops will get trapped between the pad and rotor causing a reduction it stopping power. Drilled rotors allow this hot gas to escape. slotted rotors also help dissipate heat and the hot gasses associated with hard stops but they will cause accelerated wear on the brake pads and do not dissipate heat quite as well.

 

Yeah, looking back at the report you have a point there. They did 15 stops from 62 mph with improved performance on three different vehicle platforms.

 

https://www.cobaltss.net/forums/08-10-ss-turbocharged-general-discussion-152/front-rear-brake-informational-thread-178668/ If anyone finds any other than genuinesaab.com let me know and Ill add it to that post...

 

bump

 

Now as for the drilled and slotted rotors, from what i've seen and heard about them is that, that GM engineer test was partially true, in that the Drilled ones are supposed to help give you better initial "bite" on braking and help with cooling alot more than just Slotted. However, I have seen some high performance cars with some really high quality Drilled and Slotted rotors and after some track use or heavy braking they will, almost always, develop little hairline cracks around the Drilled holes (the example is the top end DBA Drilled and slotted rotors on a 800 hp camaro).

So they are a definite improvement, however, you will likely have to change them more often if you are using them hard. That is, to the best of my knowledge, the story on those.

Now I don't know about Carbon Ceramic drilled and slotted rotors. That is probably a whole other story.

If anyone has any other info on this or facts for or against I would love to hear it.

P.S. - Are those Slotted rotors for the Saab with the brembo's the Proper match for the rotors on the SS/TC? Cuz if they are i want them, i really like the slot pattern on them. heh.
I just ask cuz i know that other post was saying that the ones for the saab don't actually work with the cobalt. Is that true?

 

R1 concepts sells slotted and drilled rotors for the SS/TC

as far as i know their the only ones that sell the slotted and drilled rotors for the SS/TC

https://www.cobaltss.net/forums/r1-c...-sale*-195476/

 

I seconded that. I have there rotors which are slotted and drilled. They may not show on the website but they do have them you just have to call and ask.

As for the stopping power they don't general increase stopping power but help keep dirt from getting caught inbetween the pad and rotor. Also helps moving the water from rain away from the pads and rotors which makes driving in the rain with this car a lot less scary.

 

you dont want gm blanks!!!

 

I got those too ... although I decided on slotted only

 

slotted rotors also help with dissapating trapped gasses between the pad and rotor. When you brake hard, the extreme heat will build up gases under the pad and the slots will removed that.

 

The one thing nobody mentions on here, is brake pad wear. What's listed below is known facts.

Slotted rotors will shave off 20-15% of life off stock/race pads.
Cryo treated slotted will shave off 15-10% of life off stock/race pads.
Drilled rotors will shave off 15-10% of life off stock/race pads.
Cryo treated drilled will shave off 10-5% of life off stock/race pads.
All this is based on personal driving styles, from strips queens, track kings, weekend warriors to babying your ride.

Stock pads last much longer than race pads, depending on driving habits. From my own exp I've used aftermarket pads "green pads". They're great for my style of driving. To get an idea on how long my pads lasted.
Stock pads: 50-70k street miles
Race pads: 10-15k track miles (they get changed at every track event)

It doesn't make sense to put on race pads on daily driver/ weekend driver, performance vs durabiltly should be the primary goal, when choosing the right pads based on your driving habits.