04-05-2024, 10:15 AM | #15 | |
Drives: 2017 Blue Camaro 1SS 1LE with PDR Join Date: Sep 2018
Location: Houston, TX
Posts: 967
|
Quote:
When I run 3R tires on my SS 1LE I normally start in PTM Dry or Sport 1 (depending on how cold it is) and change it to the next mode every lap or two and test available grip in slow/safe corners before holding the traction control button down for about 7 seconds to fully turn everything off before going at full pace. I have previously had unexpected big snap oversteer even 3 minutes into warming up the 3Rs with everything off and know of several others who have spun out on them while they're cold. I tried PTM Race at Barber on 3Rs and it works but looking back at the PDR video I was seeing a lot of intervention on corner exits in places where I got no intervention on the stock SC3 tires which means the car was holding back power because of the difference between the tires it is programmed for vs. the tires I was using. I could not feel this intervention while driving. Sometimes I can feel/hear intervention in PTM Race on the SC3 tires but sometimes it is slight enough that I can't. In Sport 1 and Sport 2 I can normally hear and feel any PTM intervention. The % lap time difference between SC3 and SC3R was also a little smaller than I would expect based on other tracks where I didn't use PTM with the 3Rs. Last edited by cdrptrks; 04-05-2024 at 10:36 AM. |
|
04-05-2024, 10:35 AM | #16 | |||
Drives: 2017 Blue Camaro 1SS 1LE with PDR Join Date: Sep 2018
Location: Houston, TX
Posts: 967
|
Quote:
Quote:
Quote:
If you're planning to use PTM, it should work best with stock tires because they were used for testing and programming the system. |
|||
04-05-2024, 10:55 AM | #17 | |
Drives: '22 2SS 1LE Join Date: Nov 2023
Location: NorCal
Posts: 118
|
Quote:
Hopefully the ECF have a similar enough friction curve to SC3 to keep PTM predictable. I do have PDR. i wish it indicated TCS and yaw intervention separately. |
|
04-05-2024, 10:58 AM | #18 |
Drives: 2017 Blue Camaro 1SS 1LE with PDR Join Date: Sep 2018
Location: Houston, TX
Posts: 967
|
I believe the maximum cornering g force is programmed into PTM based on the SC3 capabilities so if you slightly exceed that number on SC3Rs the system thinks you're sliding when you're not and intervenes unnecessarily on corner exits in this case.
There are probably other inputs besides g force to account for off camber corners but I'm just speculating based on what I saw comparing my Barber PDR videos with SC3 vs. SC3R. |
04-05-2024, 11:18 AM | #19 | |
Drives: 2004 BMW 330CI, 2022 1SS 1LE Join Date: Dec 2021
Location: NC
Posts: 771
|
Quote:
|
|
04-05-2024, 05:08 PM | #20 | |
Drives: 2021 2SS 1LE Join Date: Aug 2020
Location: Cary, NC
Posts: 821
|
Quote:
You need to use the PI Toolbox software (free) in order to see all the sensor data. Let me know if you are interested in want help with this. I've been driving in Sport1, but with the goal of staying just below the yaw rate that is needed to activate stability control and just below the throttle input needed to activate TCS. I can verify this when I later download the PDR data and view it in PI Toolbox and look for instances where either system activated and then consider the video and other data circumstances that led up to each of those moments so I can learn what caused it (me at fault, or the computer being too restrictive). |
|
04-05-2024, 08:15 PM | #21 | |
Drives: '22 2SS 1LE Join Date: Nov 2023
Location: NorCal
Posts: 118
|
Quote:
|
|
04-05-2024, 09:33 PM | #22 | |
Drives: 2020 ZL1 1LE Join Date: Sep 2012
Location: Austin, Texas
Posts: 1,338
|
Quote:
I have spun out on cold 3Rs, they must be warmed up. Also seen ZL1 1LE drivers put their cars in the wall on 1st lap out. Don't know, but likely agree the differences are probably not huge with the 3's vs 3R's, but that's when you get to advanced and start to run the car on the line at its limits. The 3Rs decline as they're used like most R compound tires. You have a very few really good laps before they fall off. Its a 2s difference for me at COTA between new and slightly used.
__________________
2020 ZL1 1LE [Moroso SC Expansion Tank, otherwise stock]
|
|
04-06-2024, 12:21 PM | #23 | |
aka BeastZL1
Drives: 2019 Camaro ZL1 1LE, 2004 Cobra Join Date: Dec 2017
Location: NC
Posts: 1,115
|
This is a good point that I hadn't considered. The PTM calibration of my 2019 ZL1 1LE is more aggressive than the calibration on my old 2018 ZL1. I'm referencing both cars on ZL1 1LE sized Goodyear 3R tires.
Quote:
__________________
|
|
|
|
Post Reply
|
|
|