06-09-2021, 08:43 PM | #15 | |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,200
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Quote:
I think there may be a relationship with the outer shoulder wear and the low static pressures and how hard a driver may push the car on the first lap or two of a session. Especially session 1. While GM recommends 26psi, I think some drivers go pretty hard right off the bat and that will not help the outer shoulder, even with high camber #s. There just isn't enough pressure to keep the sidewall from rolling over. And on the unloaded tire in a turn, those low pressures may be hurting the inner shoulder too. So if we start at 30psi, take it easy on those shoulders the first or second lap in, we will find that we can be less aggressive (< -3*) on the static camber. Being less aggressive on the static camber then helps the inner shoulder wear. Though, this looks to not be the case for you, Gun MetalGrey. Note that GM recommends toe in. Zero and toe out are not helping the inner shoulders.
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2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD
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06-09-2021, 09:03 PM | #16 | |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,200
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Quote:
While I am in a Gen5 1LE, there is enough similarity in the suspension design and overall vehicle platform that we can compare. I also run the 3R at Pitt Race, 305/30-19. I've settled on -2.5/1.6 with about 3mm toe in at the front for the next event. I too have worn my inner shoulders before the outer. I start out at 30-31 psi and "try" to baby the tires the first 1.5 to 2 laps. I also have been swapping the RF and LF during the events recently just to try and even out the wear. I've looked at running an asymmetrical alignment, less RF camber than the LF, but just haven't done it.
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2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD
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06-09-2021, 09:46 PM | #17 | |
Drives: audi R8; ss 1le; F250 Join Date: Mar 2021
Location: MD
Posts: 58
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Quote:
-2.4C 1mm toe out Rear -1.4C 0 toe |
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06-10-2021, 05:37 AM | #18 |
Drives: 997 GTS, ZL1 A10, ZLEM6, ZLEA10 Join Date: Dec 2017
Location: NYC/NJ
Posts: 630
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If u are pushing the car at pace (as is evident by tire wear), ur camber is way low. I run -3.7 and 3.5 left and right in the front (most turns are right handlers) and -2.2 in the back. I run slight toe out too and it works fine.
I would say step 1 u need more camber |
06-10-2021, 08:27 AM | #19 |
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Alberta
Posts: 72
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Wow...that's insane how much more life you're getting out of those things than I am.
Last edited by cbourbs; 06-10-2021 at 08:49 AM. |
06-10-2021, 09:06 AM | #20 | |
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Alberta
Posts: 72
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Quote:
I explained my issues. He recommended camber adjustment from -2.7 I have now to -3.5. Then up the tire pressure cold on the fronts to 33psi and run hot at 40PSI and that should make a big difference. He also said ensure to try and drive 50-60km on the road before I go to the track to get them at least 1ish heat cycle. The last set of fronts had 1 tire start to delaminate after 7 sessions in one day and I ran between 20-25 minutes each one. Did 2 warm up laps every time. Started at 30psi and ran hot to 37psi. I didn't do a heat cycle before the track. I just mounted them and drove to the track which is about 10 minutes away. Just as a note: I was also trying to run 4 hard laps with 2 cool down laps and then do it all over again. But when I do run the 4 hard laps I run as hard as I can. |
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06-10-2021, 09:18 AM | #21 |
Drives: 997 GTS, ZL1 A10, ZLEM6, ZLEA10 Join Date: Dec 2017
Location: NYC/NJ
Posts: 630
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I think more camber 3.5 will really help. Starting warm with 30+ psi will help. I am not sure going to 37+ hot is going to be good- I start to notice declining grip around 35, but compromise at 37, I feel higher than 37 will be sliding....
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06-10-2021, 10:12 AM | #22 | |
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Alberta
Posts: 72
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Quote:
Hoping to get 20 ish sessions out of the front tires. |
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06-10-2021, 11:19 AM | #23 |
Drives: 997 GTS, ZL1 A10, ZLEM6, ZLEA10 Join Date: Dec 2017
Location: NYC/NJ
Posts: 630
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keep us posted! when is your next day?
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06-10-2021, 12:26 PM | #24 |
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Alberta
Posts: 72
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06-11-2021, 03:04 PM | #25 | |
Drives: Track prepped 2018 Camaro ZL1 (a10) Join Date: Aug 2013
Location: Victoria B.C. Canada
Posts: 1,384
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Quote:
I do three warm up laps before pushing the car as hard as I can, but noticed some squirming under hard braking, I presumed because the tires weren’t up to the right pressure yet. I’m assuming that increasing the camber from -2.5 to -.3.3 on the front will only make the inside wear worse, but I’m starting to use a pyrometer on the tires to see what the heat across the face of the tire is looking like It’s very interesting to see that other people are struggling with outter tire wear, honestly is the first time I’ve heard of that with this tire, everybody else I have run into on this forum struggles with inner edge cording
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2018 ZL1; Mag 2650 and 2 inch LT Headers , every SPL suspension upgrade, MCS 2 way coilovers, sway bars, square SC3R 325's all the way around, and multiple brake cooling upgrades
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06-23-2021, 03:24 AM | #26 |
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Alberta
Posts: 72
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So I ended up putting new front supercar 3r tires. I also took the car for a good long drive and got the tires up to temperature. I then let them sit 24hrs before bringing to the track.
I also changed the camber from -2.7 to -3.1. On the track day I started all 4 of them at 33 PSI and got them hot to where they got up to 43PSI by the end of the session. After I got back from session 1 i immediately reduced the pressure down to 39PSI. So for the rest of the other 4 session they would start at around 32PSI and be hot at about 40PSI. The outside temperature from the day started off around 15C and through the course of the day got to 23C and it was sunny the entire day. The wear on the outside of the tires is more than the inside for sure on all 4 tires. The tire that started delaminated last time I went on 1 track day was the outside front tire (right hand turn track). The overall tire wear has be meaningfully improved. The tire seems to be wearing much more evenly. I probably could go to -3.5 camber on the front to even it out even more. The front now have about 5 twenty minute session and the rears have 12 twenty minute session. I will see how the wear is after the next track day. Hoping to get 5-10 more 20 minute session out of the front and rear tires. |
06-23-2021, 05:03 AM | #27 |
Drives: 997 GTS, ZL1 A10, ZLEM6, ZLEA10 Join Date: Dec 2017
Location: NYC/NJ
Posts: 630
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That’s good. Yea I would go to -3.5 - esp for the outer front. It’s fine to have a slight variance in camber if that’s the main track u run at (or run mostly at right hand tracks). I do think that going above 37 hot will not help a lot and will reduce ur grip- esp in the back. Since the wear problem is limited to the front - I never let the back go past 36 hot. The car needs the back end grip and keeping to 36 helps. Even in the front after the first session try to start at 30 hot with 3 warm up laps (which for 3r should be a standard protocol just for safety honestly) and then push the car.
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06-25-2021, 06:38 AM | #28 | |
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Alberta
Posts: 72
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Quote:
Wear is still more on the outside of the tire even on the backs. I just put the rears at the Camaro recommended track spec. Would you go more camber on the back as well? |
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