AP Racing brake systems in development

[UncleFester]

Originally Posted by Dave-ROR

Yep I managed it first for these cars with the sprint kit I believe sorry for the large pic.

I spy a cracked disc

[Dave-ROR]

Originally Posted by UncleFester

I spy a cracked disc

Yep. Time to order up some spares

Maybe I should rethink my late braking antics.... Or add brake ducts.

[UncleFester]

Made me go check mine. No cracks. I wouldn't say I brake too late or hard. Fascinating.

What pads have you been running?

[D1cker]

Originally Posted by Dave-ROR

Yep. Time to order up some spares

Maybe I should rethink my late braking antics.... Or add brake ducts.

how many days and which pads are you using?

[Captain Snooze]

Originally Posted by Dave-ROR

Maybe I should rethink my late braking antics

Ummmm... Could you please elaborate on that?

I thought these brakes were supposed to be able to handle much faster/heavier cars with out a problem. I appreciate there are many variables involved.

[D1cker]

Originally Posted by Captain Snooze

Ummmm... Could you please elaborate on that?

I thought these brakes were supposed to be able to handle much faster/heavier cars with out a problem. I appreciate there are many variables involved.

Brake rotors are a wear item, the harder you are on them, the faster they wear.

[Captain Snooze]

Sure sure sure ,understood, but is cracking considered "wear"? Is cracking a disc an acceptable event when given a hard time?

[Dave-ROR]

Originally Posted by UncleFester

Made me go check mine. No cracks. I wouldn't say I brake too late or hard. Fascinating.

What pads have you been running?

CL RC6E. I have confidence in the brakes to the point that I brake pretty late, and very hard. Not the best technique probably to save parts but I've also been trying to push it further and further to see just how late I could go. The RC6E's are sintered fully metallic pads and generate quite a bit of heat, more than semi-metallics from the temp data I gathered. These rotors saw north of 1,200 degrees in less than 20 minutes.

Also, I was driving three cars this weekend, there were a few times when I came off the track and switched cars, which is, IMO what caused the crack in the first place. Normally I give the brakes more cool down and roll the car a bit to reduce hot spots, I didn't do that every time this weekend.

[D1cker]

Originally Posted by Captain Snooze

Sure sure sure ,understood, but is cracking considered "wear"?

On track cars, the wear is from the stress applied to the rotors, and they tend to crack far before they become thin like you would see on a street car. Once they crack like this you replace them. I'm curious to see what kind of life he is seeing out of these though (number of track days and which pad was being used)

[Dave-ROR]

Originally Posted by D1cker

how many days and which pads are you using?

C300 and CL RC6E. The CL's are much better at high temps, and they stay consistent.

With the brakes, probably 8 days or so. I got 2 days out of the OEM rotors.

[Dave-ROR]

Originally Posted by Captain Snooze

Ummmm... Could you please elaborate on that?

I thought these brakes were supposed to be able to handle much faster/heavier cars with out a problem. I appreciate there are many variables involved.

They can. Rotors are going to go and I have been pushing my braking points further and further to see just how much I could do before I missed the turn in point. I found that on a few turns, but not others.

Sebring isn't the easiest on brakes either, and most of my track time is there, including this weekend.

I've been staying HARD on the brakes until the end of braking, instead of letting up over time. In other words, my technique is generating higher temps.

[Dave-ROR]

Originally Posted by Captain Snooze

Sure sure sure ,understood, but is cracking considered "wear"? Is cracking a disc an acceptable event when given a hard time?

Yes, very acceptable. We've cracked rotors worse than this on the race car in 5-6 hours...

[D1cker]

8 days at sebring is like 20 days out west, glad to see they're holding up to so much abuse.

[Huehuecoyotl]

Originally Posted by Dave-ROR

Yep. Time to order up some spares

Maybe I should rethink my late braking antics.... Or add brake ducts.

do you think greater heat capacity may have prevented this? or does this make you rethink your choice of pad? I tend to brake late myself. Or is ducting the answer?