03-05-2019, 09:48 PM | #281 | |
Drives: 2019 ZL1 1LE Join Date: Feb 2017
Location: Gilbert, AZ
Posts: 648
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Quote:
Compounds are meant to start working at certain temperatures (you can find this info on Carbotech's and GLoc's websites). If you think the front brakes operate at the same temperatures as the rears, you're..wrong. If you put XP12's on the front and rear, the rear pads will probably last 6x longer than the fronts, and it's because of how much harder the fronts are working. I posted earlier about how I run XP10's up front and XP8's in the back for tracks that are less harsh on brakes, and it has worked out perfectly on this car. Running 10's in the back I'd probably be lucky to see the same amount of pad transfer as what I was seeing on the fronts. It is NOT advised to run the same pad compound front and rear.
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Old: 2017 SS 1LE
Old: 2017 ZL1 Current: 2019 ZL1 1LE |
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03-05-2019, 11:11 PM | #282 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
Not only an SS 1le but the same goes for a zl1 and zle. If you dont know what a bias is or what it does to a car's handling, or why many race cars have adjustable bias by a driver: you will benefit from looking it up. If you prefer more stability and understeer on entry, there is nothing wrong with your set up. But it is not optimal for car's intended handling. Cheers! PS when you look up various pad charts dont focus only on temp ranges, but also pay a very close attention to torque characteristics. |
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03-06-2019, 06:00 AM | #283 |
Drives: 1LEs Join Date: May 2009
Location: DFW - Texas
Posts: 1,319
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Front vs. rear wear is very dependent on track, driving style, use of PTM, etc. PTM can chew threw the rears quickly if used on one of the lower / more invasive settings.
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03-06-2019, 10:26 AM | #284 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
All modern stability system use this principle now. Just fyi. |
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03-06-2019, 02:13 PM | #285 | |
Drives: 2018 1SS 1LE & 1973 Datsun 240Z Join Date: Sep 2015
Location: Ontario
Posts: 574
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Quote:
You need the maximum combination of front AND rear brake torque to get that load transfer to the front in the first place. A properly designed brake system will have taken this into account and appropriate caliper piston area, rotor diameter and pad coefficient of friction will have been selected to achieve this. Typically the same pad coefficient of friction is chosen for the front and rear as part of this design process. Consequently, installing a pad with a significantly lower coefficient of friction in the rear can result in rear brakes that are unable to generate adequate brake torque for sufficient load transfer to the front axle. Therefore, there is less friction between the front tires and the road, and the front brakes will more easily overpower the traction available from the front tires. This is of course safer than having the rear wheels lock first. But if you swing the balance too far to the front, the front wheels will lock up far too easily and braking distance is made significantly worse. So, saying that it's not advisable to run the same compound front and rear as a blanket statement is asking for trouble. Now, it just so happens that the XP10's and XP8's have a very similar coefficient of friction, and will likely not negatively influence brake balance if run together on the front and rear axles. As far as there being a benefit with respect to the temperature range, what evidence is there that the rears run cooler to the point of requiring a different temperature range? Sure they do less work, but the pads and rotors are significantly smaller and have less air flow. And, why does it mater if the rear pads last longer, so long as they generate adequate brake torque? Nigel Last edited by Whitespeed; 03-07-2019 at 06:52 PM. Reason: Minor wording correction |
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03-06-2019, 02:16 PM | #286 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
Excellently articulated piece of writing. Last edited by TrackClub; 03-06-2019 at 04:19 PM. |
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03-06-2019, 06:22 PM | #287 |
Drives: 1LEs Join Date: May 2009
Location: DFW - Texas
Posts: 1,319
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I understand, but, my buddy with a ZL1 using PTM in Dry and Sport went through four set of rear pads (!) to one set of fronts on a tight track. I think is was using too little right foot control and depending too much on PTM to combat wheel spin.
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03-06-2019, 06:34 PM | #288 |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Yep that can happen if a driver leans completely on Stabilitrak to correct driver errors. My guess is he was understeering on corner entries into oblivion
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03-06-2019, 07:25 PM | #289 |
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This front vs rear pad material discussion is going on now on the FB 1LE R page. So far some people like to stagger the material and have no issues, while others keep the same front and back material and have no issues.
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03-06-2019, 09:04 PM | #290 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
But to suggest that running the same compound F and R is bad advice (on a Camaro) is plain nonsense. |
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03-07-2019, 02:55 PM | #291 |
Drives: 2023 CT5 Blackwing Join Date: Sep 2016
Location: Orlando
Posts: 1,619
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I have been running my 1LE on Track and AutoX for more than 2 years now.
7th set of tires, 3rd set of rotors, 6th set of pads. I can now proclaim with a completely straight face...the OEM pads are magic. They are the finest 'all around' pad I have ever run. Yes, there are pads that stop 'faster', but nothing I have ever run matches the OEM. Daytona in July? No problem. Sebring? No problem. AutoX? Work good. And while they generate dust, the dust does not eat the wheel finish.
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2017 HBM SS 1LE
Sold 2023 Wave Metallic CT5-V Blackwing M6 |
03-07-2019, 04:19 PM | #292 | |
Drives: 1LEs Join Date: May 2009
Location: DFW - Texas
Posts: 1,319
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Quote:
For 2019, playing with something different up front. Hint - they weigh a bit over 19# less per rotor than ZL1 rotors, work with the stock J6H calipers, use a (different) stock GM pads, and use J6H hats that I tweaked a little. Plus, a little bit of aero stuff on my SS 1LE, too. A let you know how I like it all later... Oh, I know all about the CCB’s are good / not good for the track. I just like to try things and tweak. Got a new set of J6H rotors on the shelf and plenty of stock and low mile pads, so, in no time I can be back with steel fronts. Once again, it’s the engineer in me and the constant mods I’ve always done to cars. Plus, a vendor told me only their hats work and you can’t get anything else to work and have to buy it all from them. Uh, wrong... I can create another thread about this science experiment to not derail the stock / track pad good discussion ongoing... Last edited by RUQWIKR; 03-07-2019 at 04:35 PM. |
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03-07-2019, 04:32 PM | #293 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Quote:
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03-07-2019, 06:48 PM | #294 | |
Drives: 2017 SS 1LE Join Date: Mar 2016
Location: Monterey, CA
Posts: 2,474
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Quote:
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