im in the process of getting slotted or cross drilled rotors. a friend of mine said that the slotted wore down brake pads quicker? is this true
If it doesnt break then you didnt drive it hard enough!
Slotted will not beak as easily under high stress (very high stress, like racing or auto-x). Thus companies like power-slot only make slotted. Otherwise they're just about equal. I personal think cross-slotted (both slots and holes) looks the fanciest.
It is true that slotted rotors will eat your pads up faster than cross drilled. Cross drilled rotors have a tendancy to crack so I would stay away from those though. If you buy pads with a life time warranty you won't have to worry about the fact that slotted rotors eat them up faster.
Slotted AND crossdrilled rotors take away too much surface area IMO c.t.s.
slotted are the way to go
Im a Xbox 360 fanboy...and damn proud of it!!
Cross slotted take of 2% more than cross drilled. And that's not much when you've got 11.9" rotors. :-)
And I said cross slotted for the looks. Most people who put on slotted or drilled rotors do it for the looks, not because they'll use the performance increase.
Meant to say that cross drilled b
reak or crack easier than slotted. Slotted is still weaker than stock-style, but not by much. Just never auto-x or race with drill or cross slotted and you'll be fine. Normal driving doesn't cause cracking, extreme use does; it's a common misconception that they'll just crack one day for no reason.
if you drive right, and learn to use other methods of slowing down, like simply completely letting off the gas and let the engine do some of the work, not following people so closely as many do...
it wont eat up pads, which makes it sound like you go through pads, monthly or something.
a few things many NEVER do which cause em to go through pads alot...
1) no break in of seasoning the rotor or bedding the pads.... many simply go out and abuse em....
2) many are constantly on the brakes... constant use = constant wear
also cross drilled are more prone to cracking when they are just drilled straight. chamfering the hole tends to lessen the degree of cracks, but anytime you have sharp edges, expect stress cracks.
Here's a good picture:
In the first you can see a standard drilled hole. Big time edges to crack along.
In the second you see it's been chanfered. Less of an edge, but still very prominent.
In the third you can see a raidial chamfer, better yet, but room for improvement.
The last image shows the latest in chamfer technology. Slotted is still stronger, but only because it doesn't fully penetrate the metal.
The point of the brake pad / rotor combo is to optimize contact patch. The slots and cross drills release gas that builds up with crapy pads. So, if you're looking for optimum performance and know how to maintain your car, then go with a cheap set of stock style brembo rotors or the like. Rotors are throw away parts, unless you're going for a show look. Patterns look great and perform like crap. Talk to someone that actually races.
That which does not kill you makes you stronger!
BADAZ24 wrote:The point of the brake pad / rotor combo is to optimize contact patch. The slots and cross drills release gas that builds up with crapy pads. So, if you're looking for optimum performance and know how to maintain your car, then go with a cheap set of stock style brembo rotors or the like. Rotors are throw away parts, unless you're going for a show look. Patterns look great and perform like crap. Talk to someone that actually races.
So what kind of acutalracing do you do?
I noticed a performance difference when switching from slotted rotors to OEM style brembos. Both times I was using Axxis Ultimate pads (which I would harly call crappy). Inital bite was better with the slotted rotors as well as wet braking(steam has to go somewhere). I would really only reccomend slotted rotors to someone trying to squeeze every last ounce of braking power from their car. I would not reccomend cross drilled rotors to anyone. I get along fine with the brembos, and like badaz24 said, they are cheap compared to slotted rotors.
C.T.S.- Taken straight from PowerSlot:
"Slotted rotors trade only 3. 7% of their surface area to the slots that vent the gasses, while drilled rotors sacrifice up to 7. 75% of their surface area, and rotors that are both drilled and slotted sacrifice up to 9. 38% of their surface area. Less surface area means less stopping friction. "
So when switching from slotted to cross drilled and slotted you lose up to an additional 5.68% of surface area (which is MORE sq. in. on a larger rotor
).
Zach wrote:C.T.S.- Taken straight from PowerSlot:
"Slotted rotors trade only 3. 7% of their surface area to the slots that vent the gasses, while drilled rotors sacrifice up to 7. 75% of their surface area, and rotors that are both drilled and slotted sacrifice up to 9. 38% of their surface area. Less surface area means less stopping friction. "
I think you forgot a few key words there. It depends on what brand you get. The cheap/crappy brands (which you can find all over eBay, if you're interested) you could sacrifice
up to 5.68%. The point I was trying to make is that it's a relatively small difference. Besides, your have higher pressure on that smaller area,
laws of friction.
The point is: Slotted for any performance applications. Drilled or Cross drilled for looks only, don't race on them.
