Has anybody bought these rotors from him? If so, how are they so far?

 

I have been testing them and I have a few observations.

They grab like the dickens. Stops beautifully. The fronts save 2-3 pounds of unspring weight, which is nice.

I haven't YET had the chance to test them at the track. That will be happening on June 29, if all goes to plan. They have terrific stopping power, look great, saves a little unsprung weight, I think they are terrific.

They do, by their nature, go through pads. The are drilled and slotted so they are rough on pads, which creates dust, obvisously. I have had stock pads on since we put the rotors on, but the added stopping power is very nice...and noticeable. But be prepared for dust, which is the nature of slotted drilled rotors.

BTW, they are not cast and then drilled...the are cast with the holes already in them...this will prevent the cracking and breaking that some rotors would have as you compromise the integrity of the iron when you drill through it.

I will also be testing the Project U race pads, so check out that post. It will probably go in Under The Hood...which is where a lot of us who modify the S2000 hang out.

Email me or post if you have any specific questions...

 

The brake dust problem happens because it's sloted? What if it's just drilled not slotted? I'm assuming if you get them plain, there would be no brake dust problems right? Also, is the added braking power due to the rotors or the fact that they are drilled and slotted?

 

The drilled and the slotted parts of the rotors are there to provide additional cooling. They also have edges that wear through the pads more quickly and as I said that is the nature of slotted/drilled rotors. I think you can get them without any slots or drills. In fact, I'm pretty sure you can. If you are after the weight savings, that is respectable, as well...

And if you got just the plain surfaced rotors, there would be no additional brake dust. The brake dust is a function of the slots and holes...

Adding the holes or slots will increase dust. But if you just have one of the other, the dust will be less. If you have both the slots and holes, then you will have the most....it's a matter of degree.

 

Do the rotors show any sign of cracking due to the cross-drilled design?

 

No, there is no evidence of cracking...as I said, the rotors are cast with the holes and slots, they are NOT cast and THEN drilled and slotted, which is the process that leads to cracking/breaking. In the form of the cast, the holes and slots and already there...that gives them strength against cracking.

 

The Stillen cross drilled rotors I have on my Jeep GC, have counter-sunk holes and although I don't know the life of the pads yet, I haven't noticed a difference in brake dust. The stock rotors on the Jeep warped after a few thousand miles and this seems like the popular fix. Are the Stook rotor holes chamfered?

 

I'm assuming there's added braking power, because of the cooling effect that the slotting and the drilled holes have on the rotors.

 

I don't know if the stock S2000 rotors are chamfered, someone else will have to answer that.

And S2R, yes, while brake pads and rotors need to be at an operating temperature to work best, cooling rotors under serious load (with slotting, drilling, venting, etc), braking will improve. Keep in mind that the improvments are BEST felt when there is lot of braking...benefits include less fade and better pedal feel...all a consequence of managing heat more effectively.

 

Greg, do you have a feel yet for pad life with the new rotors versus stock?