Which Porsche are we talking about? One with a large caliper w/ a 2 piece floating disc?

 

That actually makes sense. I think I would expect it to happen 180 degrees away from the rotor. The caliper and pad are keeping that part of the rotor hot. The rest of it is cooling off and contracting, basically pulling itself apart.

 

Thanks man, I'm knocking on wood for you. I just like to research the problems I'm bound to encounter ahead of time so I already know the path I want to take when I actually encounter the problem. This year I'm doing 3-4 track days a month plus 2-3 autocrosses a month and getting faster very quickly, so it's bound to be an issue. If I never crack a rotor, then I've just wasted some of the time I spend farting around on the internet at work, which is a far less evil than wasting time I could be out on the track.

BTW, my mom used to work at Heinz and I love ketchup too.

 

I completely agree. I make it a point to drive around slow enough where I don't have to touch the brakes on the cool down. So I generally pop the car into 5th or 6th gear and tool around around 40-50mph. Being in 6th bringing the engine speed down should help with cooling off the coolant and oil too.

As for being disappointed with Honda... well, you are comparing it to a Porsche which starts out at a whole different level of performance and expectations. I don't think the S2000 was ever intended to be a track car off the showroom floor, just a fun car to drive around. Not that it will make you feel any better, but C6 Vettes crack rotors perhaps even faster than S2000s. And they go through rear wheel bearings like nobody's business too.

 

Nope, just a 944 Turbo S. The discs are one piece vented front and rear and the front calipers on the Turbo S come from the 928 S4. Coincidentally the front pads are the same size/shape as the Ferrari F40. As far as I know none of the street model porsches come with 2-piece rotors, even with the pccb option.

 

No, the NSX rotors & Accord calipers require a slightly different offset hat. I sold my RacingBrake.com rotors/hats (designed for the stock caliper) to another track guy after I installed the Accord/RB BBK.

I don't think Honda screwed up on our brakes, they just put the priority on light weight brakes that would handle any type of "spirited street driving." I know that if it came stock with Accord size calipers and some other Honda had our brakes on it we'd all be swapping to the light weight calipers

 

Thanks again for the racingbrake info.

We're going totally OT here, but I think it had more to do with the minimum cost/availability that would handle "spirited street driving" than the minimum weight. It was cost that originally killed the Japanese GT car in the US and Honda was trying to build the Civic of sports cars. Going to another manufacturer like brembo could have put the sticker for the S2000 in the mid 30k range when the car first came out, which would have put it too far from the Miata and too close to the Corvette than Honda's marketing staff wanted to be. Aren't the S2000 calipers the same as the Civic SI and RSX-S?

My only wish for the brakes is that they designed the system with room to grow. With the high offset of the wheel and the limited clearance between the caliper and the wheel there is not much room for anything bigger than what the car came with and definitely not enough room for a fixed caliper under the stock wheels.

 

Yep. Stock class S2K, only mods are hardrace camber joints, pads, fluids, lines, and SPG seat.

I have brake ducts. Running 225F/255R RE-11s. DTC-60 front pads, XP-8 rear pads.

I cracked my front rotor after 5-6 track days (about 4 20-25 minute sessions, each day). I do my cool down laps, avoid the brakes as much as possible, and do an additional 3-5 minutes of driving around in the pits before parking. I don't keep moving the car though.

My rotor cracked under the caliper/pad, first time too. I definitely let this set of pads/rotors go a bit longer. I usually change them out once I see all the micro cracks forming.