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Suspension | Chassis | Brakes -- Sponsored by 949 Racing Relating to suspension, chassis, and brakes. Sponsored by 949 Racing. |
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03-27-2023, 12:25 PM | #15 |
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What kind of times are you running at VIR and Summit? Summit is pretty hard on brakes. VIR a lot less so due to the long straights. Are you running ducts? Ducting in cool weather can lead to cracking or pads not reaching temp.
Last edited by Wangspeed; 03-27-2023 at 12:36 PM. |
03-27-2023, 01:16 PM | #16 | |
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“Hello, This appears to be a disc that has seen many track days and heat cycles. This looks normal for a disc that has been used for track use and also street use with DS1.11. We do not recommend street driving with the DS1.11 because it is designed to operate under track temperatures so in street use it can be very hard on the rotor surface.” |
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03-27-2023, 01:23 PM | #17 | |
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I only did one day at Dominion, two at VIR (one rainy all day and one dry), and one mostly wet at Shenandoah total on those brakes. The pads still look new. I do not have ducts. Last edited by Kulebrero; 03-27-2023 at 01:54 PM. |
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03-27-2023, 02:14 PM | #18 |
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Tell us what your warm up and cool down procedures are.
Also, what does the other front rotor look like? And what about the inside surfaces of the front rotors?
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03-27-2023, 03:14 PM | #19 | |
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I haven’t engaged ABS but once in the rain, my lap times aren’t braking any records, and I’m running RS4s which aren’t the stickiest tires in the world. Based on everything I’m reading, however, it would appear I’m somehow braking harder than the average Joe. I have yet to put a single tire off track or have a spin/off of any kind even in the rain—but of course now that I say it, it’ll be the first thing to happen next time I’m on track. I don’t baby it on track, but I’m also not 10/10 out there. It seems I need a real BBK. I may need a few days to accept this was the costliest decision of my build so far as I may need to buy new wheels and tires because my 17x9s likely won’t fit anymore. On a separate note, I have a kidney for sale. Make an offer. |
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03-27-2023, 03:58 PM | #20 | |
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Based on the amount of heat you are generating, I recommend you look for a much heavier BBK, rather than the weight-reduction based BBK you are currently using. Check out this thread, for example. https://www.ft86club.com/forums/showthread.php?t=147978 Keep in mind that it is VERY easy to inadvertently get into ABS on a modern car without even realizing it. You may not even feel the ABS engaging, as modern ABS pulses very quickly, and you only really get the crunchy feel when you're DEEP into ABS. |
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03-27-2023, 06:08 PM | #21 | |
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I had a Miata before with stock brakes and $80 pads. Used it and drove it the same way as the 86. Never had a brake issue. 12-14 track days after, the pads still had more than 50% left and the rotors were perfectly fine. When asked if I’m engaging ABS when braking, I can say I’ve only felt it once in the rain. I can’t say it has never happened otherwise, but certainly not enough to notice it. I’m sure thermal shocking is directly related to the premature damage to the rotors, I just don’t know what I did. Not that I’m policing every person on track, but I haven’t noticed doing anything drastically different than anyone else as far as picking up speed on the first/second lap and cooling down on the last lap and on the paddock. I’ll take whatever advice I can get to help prevent this in the future because at $700 per rotors every three track days, I’ll have to quit the sport. What am I doing to thermal shock the system? |
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03-27-2023, 07:36 PM | #22 | |
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03-27-2023, 07:39 PM | #23 |
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These are $299 per rotor from Essex, if I’m thinking these are what you are referring to.
AP Racing J Hook Competition Disc Replacement Ring (11.75" x1.25" / 299x32mm)- Right Hand, 60 vane Part #: 13.05.10084 Brand: AP Racing AP Racing J Hook Competition Disc Replacement Ring (11.75" x1.25" / 299x32mm)- Left Hand, 60 vane Part #: 13.05.10085 Brand: AP Racing |
03-27-2023, 08:36 PM | #24 | |
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03-28-2023, 07:27 PM | #25 |
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So, the discs were thermal shocked, overheated, abs was going off constantly causing excessive heat or they were driven on the street with a pad that was too aggressive, according to the supplier.
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03-28-2023, 08:55 PM | #26 |
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A too aggressive street pad will cause increased rotor wear, but not cause the cracking. The cracking is is pretty much all thermal shock.
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03-28-2023, 09:20 PM | #27 | ||
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03-29-2023, 11:02 AM | #28 | |
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