If I can get some inputs from you guys about rotors.

I've used Powerslot's rotor on my previous car, and it works very well for what I need. But I definitely dig the looks of Cross drilled slotted rotors. Here's couple things I've heard about cross drilled rotors.

1.) Tends to crack around the drilled points.
2.) Reduce performance since more area are removed from drilling, causing less surface area for the brake pad to work with.

Just wondering how often does the cracking happen to s2k owners(Or any car in general)? And does it reduce the performance of the rotor compare to a regular slotted rotor? If you guys think a slotted cross drilled rotor is good, which brand would you recommend?

 

my reaearch of opinions of others is that the slotted vs drilled is mostly show on the street,perhaps there is some merrit to hard track use, but it is for show on the street...the S comes with awsome brakes for everyday use, find another mod that actually has a benifit to you for your money other than show.

 

their more for the bling factor. if you heavily track your car i would get slotted and cross drilled since you would be changing them a good amount.

for the street and normal driving i would buy slotted. i have a fear that the drilled would crack.

 

i have never heard of drilled rotors cracking.... they are drilled for a reason, to disipate heat..... most high performance brake rotors are slotted and cross drilled.... and others such as the spoon brake rotors are only drilled...

 

A lot of cross drilled rotors can crack from heavy track use. Slotted rotors do not.

Spoon cross drilled rotors are unlikely to crack because Spoon employs a different manfacturing process, or at least thats their claim.

For slotted rotors, there are many choices, but I like Endless.

 

Cracking is very uncommon for a quality rotor used for normal or spirited driving. I wouldn't worry about it. Consider vented rear rotors too. I think cadmium plating is overrated though; it comes off quite quick.

 

I did a lot of research on this when I replaced my OEM rotors with ones that are slotted and cross-drilled. I do believe that the slots and or holes do reduce rotor temperatures, I've seen the effects when our group has done track days. Rotor temperatures were 80-100 degrees F lower on average. However this is highly driver dependent but two stock S2000's that run very similar lap times should have similar brake temperatures.

There seems to be a consensus that casting the rotors with the holes already in them reduces the amount of cracks or microfractures that can form from the cross drills. I would assume the same would go for slots.

If either machining operation is done after the rotor is cast you have the risk of a microfracture forming since the machining can leaving tiny stress concentrations. To reduce the stress concentrations chamfers can be added to the cross drilled holes and slots can be stopped short of the rotors outer edge.

Another option is to have the rotor cryogenically treated. This hardens the steel casting which will reduce the chances of the material developing micro fractures.

Check out www.frozenrotors.com or do a search on the web for "cryo treated rotors" and you'll find some good information.

Jcarlton who is on this board sold me my set of rotors and they've been working great. Careful with the Cadmium plated ones as they plating most likely will tend to flake off if you track the car.

 

I have had a slotted, cross drilled, plated, and cryo treated set on my car for a year now with no problems. I also got mine from Jcarlton who gave me a good price, especially with shipping to Hawaii. They work as good or better than stock rotors, and they look much much better behind my wheels. Seeing rusty stock rotors behind my awsome aluminum wheels just wasn't doing it for me.

 

If it is for the street/show, then get whatever you think looks best. I'm serious. They will all work well enough for street use unless the rotor is a total POS.

If it were for the track I would assume you would already know the answer, but the answer for the track is "neither". On the track, rotors are an expendable item. Just get whatever stock-compatible rotor is cheapest (and that will mean it is not slotted OR drilled).

 

If you are going to track your car, I would go with blanks. Slots might hold up. Drilled usually will not. Cadmium plated rotors are fine for the street but the temps at the track with race pads will cause the cadmium to melt off. I use a set of cryotreated, cadmium plated blanks for the street and autoX (with OEM pads) and a set of OEM rotors with Panther+ for the track.