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Tracking / Autocross / HPDE / Drifting What these cars were built for! |
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11-18-2021, 10:21 PM | #57 | |
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Imagine the optimal braking is achieved at 1000 psi of brake pressure, and a pad has accelerated wear past 1200 psi or brake pressure. If you apply 1100 psi of pressure (a bit too much), the ABS might switch between 900 and 1100 psi at high frequency, generating 1000 psi on average. Now imagine you're pushing 1500 psi instead. ABS can alternate between 1500 and 500, and each time it goes in the 1200–1500 range the wear will be much higher than in the previous case, or in case of optimal braking. Kinda like drilling a hole in concrete with a regular drill vs impact drill. So even though the amount of energy is the same, and thus temperatures should be (roughly? exactly?) the same, it's possible that other things can significantly change the wear rate. Hopefully this mental exercise isn't too far from what's happening. |
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11-18-2021, 10:24 PM | #58 | |
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The Following User Says Thank You to Stonehorsw For This Useful Post: | CSG Mike (11-18-2021) |
11-18-2021, 10:27 PM | #59 | |
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Brake system is sensitive to the apply rate, temperature, pressure and speed (this is covered by AK Master). One evidence for me of what is going on is to compare the heat checks on the brakes, where in one you can see much more pronunced cracks. Which for me, leads to thinking that may had heat spots, which happens in case of BTV or other issues. |
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11-18-2021, 10:29 PM | #60 |
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11-18-2021, 10:48 PM | #61 |
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11-18-2021, 10:52 PM | #62 |
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I dare say wet and trying to be fast with TC nannies on wears brakes. Yes/No
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11-18-2021, 11:05 PM | #63 |
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11-18-2021, 11:13 PM | #64 |
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Yeah and chemistry is cool, but still not cool enough to break the laws of thermodymanics. No one is belittling your pads - I'm sure they are great, especially considering the mountains of happy C1/C2 users. No pad has it all, and brake manufacturers have an extremely difficult job of navigating a multitude of attributes like noise, fade resistance, wear rate, friction etc. to make a marketable pad for a specific application. It's a hard job, and I'm glad you guys do it. I just want to set the physics straight, especially when claiming that ABS use results in higher pad temperatures. That is simply demonstrably false.
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11-18-2021, 11:17 PM | #65 | |
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I personally organized and crowdsourced a lot of information on another popular caliper (thread 1, thread 2). I put a lot of my own time into that, and shared that information with everyone, for free. You think the problem is that they spent their money and time on doing the research on B-M4 wheel fitment? If so, that sounds like an ineffective business model. Nothing prevents me (or someone else) from crowdsourcing that. Surely that shouldn't be an existential threat to them? |
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11-18-2021, 11:42 PM | #66 | |
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Your application of thermodynamics is also ideal, but doesn't actually apply. Pressure = heat; ice melts faster if you're pressing down on it. Imagine overactive use of ABS, from way, way too much pressure. What happens now? This is very, VERY basic example. |
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11-19-2021, 07:19 AM | #67 | |
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11-19-2021, 08:25 AM | #68 | |
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Yeah, makes some sense that wear rate with ABS cycling right around lockup pressure could be significantly higher than maintaining pressure just below lockup. Any case, if you're *hard* on the brakes *deep* into every corner, ABS or not, it makes sense that's gonna wear pads out more quickly, and it's not the fastest way around either... I can see how ABS could make the wear rate worse. Also, with some nannies still on, more excessive brake consumption... With or without ABS, driving style will play a major role in heat into the brakes and wear rate. This is obviously the case at all HPDE driver levels but it's also true at the highest levels of motorsport. Different drivers, even turning the same lap times in the same car, have different brake usage and needs. @CSG Mike helped me out with my brake pad selection. I resisted C2s because of $$$ but ultimately that's where I've wound up and they work great *for me*. But it's not "one size fits all. Mike has a lot of practical knowledge of what works best with different kinds of usage and driver demands, so @Jstyle I think yer in good hands... Last edited by ZDan; 11-19-2021 at 08:38 AM. |
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11-19-2021, 01:32 PM | #69 |
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Man, this derailed quickly. But lets keep going to see where it gets us. In my own personnal experience, with excesive use of ABS the brakes were hotter for me than without ABS use (minimal) or completely removing ABS (module was taken out, prop valve installed instead). There is another driver with the same car, same brake kit, same disc and same pad in the events I go to, he relies on ABS a bit too much and I can tell, just by looking at his rotors (his fronts are about done in 1 year of use, mine have done 2 seasons and are still rocking, his car is an NA frs without aero running 200TW tires, mine is an LS swapped, heavy aero car running stickier tires).
So, @Goingnowherefast, I would like to know why is there more heat on his car, or why was there more heat in mine before I got better (and ultimately went much faster) at managing ABS. Im always up for learning something. |
11-19-2021, 01:43 PM | #70 | |
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but only visually estimated the heat based on wear patterns and overall wear over time? |
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