Quote:
Originally Posted by roastbeef
very interesting. i'm curious to see if you notice increased pad wear. jordan yost and i talked about brakes last december at willow springs. i'm tearing through pads like they are butter... i got two days and two sessions out of my cobalt xr1's and almost ran them down to the backing plates. jordan and i talked about a lot of things regarding brakes, but he mentioned that the J-hook design is pretty brutal on pads, but it helps with the bite. i was interested to hear that you noted more bite with the same pads and same pad shape. there are other variables between the kits, but i would think the rotor slot pattern change would have the biggest influence.
andie told me how long you run a set of rotors... i wonder how fast you're going to go through pads now. i'm sure you're pretty in tune with pad consumption rates on your previous kit, i'd be interested to see how much your pad wear increases.
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Without traction control, I got 39 days out of my last Stillen rotors, and I was getting 13-15 days out of a front set of 18mm pads. When I used traction control, I used to get noticeably less life out of them---around 25 days from the rotors and about 9-10 days from pads.
I think it's also important to note that my car has been lightened quite a bit, which also helps my situation. And given that you are taller than me and built like a linebacker, I'm lighter than you as well. That could be a total of 400+ lbs difference on track. I'm guessing that the XR2, being a lower torque pad than XR1, could last a bit longer due to being a different compound.
If you went though pads in less than 2.5 days, that would mean after day one you wore through almost half the pad. I only glanced at the pads after I was done on Sunday, and they certainly did not look like they were nearing half. (The transponder system says I ran 33 laps on Sunday.) For testing and curiosity sake, I guess it's good that i started with an 18mm pad which allows a direct comparison to the old kit's wear rate. Originally, I did not want the 25mm-capable version of the kit---more money, heavier kit, more expensive pads. But I'm glad Casey convinced me to go that route. Whatever the wear rate is, and i'm sure it will be fairly high, the 25mm will simply last longer, and they're really not much more expensive than the 18mm.....I think like $50-60 more. (Cobalt Friction is making a set of 25mm pads right now.)
I guess it's also worth considering how aggressive the driver is with the brakes. A novice driver could torture the brakes quite easily and put in slow laps. And a pro might fly and be quite efficient with them. So, looking at a driver's braking characteristics could have value.
Anyway, I have also wondered if the J-hooks act as a cheese grater. I guess we'll find out! They're great so far!