I'm in the market for some slotted rotors. Is there any cheap ones out there (under $250 a pair shipped)?
I could only find crossdrilled + slotted rotors from Brembos.
Endless 24-slit rotors are a bit too expensive.
I know AP has some slotted ones for ITR at around that price but I can't find them on the web. Anyone here carries those? Or similar products?

Thanks!

 

Try fastbrakes

 

I visited their website but couldn't find anything on slotted rotors....
I sent them an email a minute ago. Hope I would hear something from them soon. Thanks!

 

Powerslot

 

Just get regular rotors. Slotted doesn't help.

Warren

 

I think you can get Brembo blanks from http://www.collettimotorsports.com for like $32/ea or something like that.

 

I agree with Warren. I ran powerslots and couldn't wait for the day to take those fuggers off to use some good rotors instead.

 

I read a research done by some auto lab in Asia that, slotted rotors ran approximately 70'C to 100'C cooler than blank discs. I don't remember the specifics but it's mostly because the grooves can rapidly expel gas and constantly revive the friction material surface.

But you're right, for me an occasional track driver, the 100'C difference might not be noticeable.

 

so, is blank, slotted or drilled rotor better given that they made from the same material and same size??

 

They in lied. I'm dead serious. What they failed to tell you is that they either changed the brake compound, they measured it at a different time, wasn't even the same god damn car, and/or they only did 1 stop with the slotted rotors. 100c cooler, haha, I'd buy those in a heartbeat if they existed.

Slotted and crossdrilled will run equally, if not HOTTER than regular vented rotors. You are losing material when you slot the rotors, and those stupid little slots get covered up on the track when the disc gets really hot. You couldn't even chisel out the material that goes in there because it is a combination of the rotor and pad material filling it up. Useless.

Warren

 

Warren keeps beating me to the punch. But that is 100% incorrect. First of all, you are losing mass which could otherwise be used for cooling. You are loosing surface area. You are also assuming that you are using hella gaseous pads, which are rare in a good performance pad these days. Also like warren said, when I used slotted rotors on the track they weren't really slotted anymore after a session, just solid discs, mostly metal, but with pad and rotor shavings/dust in the slots. If anything they stopped the car less effectively, they certainly didn't disapate heat better.

 

They do it to..

 

I agree that blanks are the best rotors to get. My staple track rotor has always been Brembo blanks. But .. I have had good luck with PowerSlots. I have had a set for the longest time. It has eaten through a set of R4S, R4 and stock pads. Still going strong. A little pricy though. But if you are in it for the look, I would go with PowerSlot.

 

Thanks Chris. Nice pic.

73rd, what you are looking at is a rear Porsche rotor. Porsche 959. That's right, even their supercars have cracking rotors. Every Porsche racer I know that has cross drilled rotors dumps their rotors after 2-3 weekends @ the track.

Warren

 

Cracking.. thats not good.

 

That's a good question!

Boy, they sure do look pretty!

Until they crack....warp...and can't be turned.

 

I don't think they lied about the result as it was done by a magazine to show the effectiveness of different rotors, not the rotor manufacturers.
The test was not done on cars. It was done on a "turning machine" with a caliper on it. Then the temperature was taken by a gun, the same kind of gun that reads tire temperature. That test seemed pretty valid to me.

Anyway, Warren, I'm not doubting your real-world experience accumulated from racing. I would definitely take your opinion into consideration. Thanks for everyone's input!

 

For looks.

 

none of those guys race anywayz

 

haha this coming from someone with a 1320 et and trapspeed in his sig...

 

I have cracked cross-drilled rotors on the track. However, I have also cracked slotted rotors, and solid rotors. And I don't think any one type cracked sooner than another.

The problem is that rotors get hot when you go around a racetrack. And they expand - but not uniformly, since the outer diameter of the rotor is bigger than the inner diameter.

In fact, the cracks happen when the rotors cool. When you're on the track, the rotors expand and the cracks fill in. It's when the car cools down that the cracks separate.

All you need to do is keep an eye on them. When the cracks are big enough to feel with the edge of your fingernail, it's time to replace the rotors.

Remember, rotors are consumables, just like brake pads and tires. I can get 6-12 track events on a set of front rotors, and then they crack and I replace them. (As far as I can tell, rear rotors last forever.)

 

Spoon slotted rotors, they are made by Honda with higher quality steel plus they have special coating on them. Price is pretty decent. Another option that I suggest is the Endless Basic ceramic rotors but they are a bit more than Spoon . I have them on my Civic and have attended a lot of circuit events .... no whops or cracks with my CCX pads.

Give it a try.

 

After the ITR expo I had exceptional shudder when braking from the 50 mph + range. I assume my stock rotors had warped since the braking was weak and the shudder clearly noticable. So lesson here: don't replace your shot rotors with OEM. If you do a lot of track events you may save a lot of time by installing Power Stop or some other good brand rotors that handle much more abuse and can be used for up to maybe 700 track miles.

 

My power slots had shudder from the factory, and this was only worse after a track event. I switched back to brembo blanks after two events with POS slotted rotors, and am 100% glad I did. They are cheap and they work better.

 

Ok, I wasn't clear whether the shudder would go away when switching to Stop Tech. The Stop Techs shine in that they dissipate heat better, due to the unique vane design in the rotor, which cuts down braking distances. Apparently they give a compeditive edge, not a maintenance edge.

And about the
"Spoon slotted rotors"
That's a great idea!
But will it take half a year for these rotors to actually arrive at anyone's doorstep?!
My friend waited 8 months for his Spoon strut tower bars. I've waited nearly three months for my Spoon sw388's. Spoon is great, but where is the availability? If you need rotors fast, and need to replace them often, go elseware, unless you can find someone that stocks them regularly.