RT660 track pressures?

RacerXnh10 · 09-08-2022, 07:44 PM

Did some searching, wasn’t able to come up with anything particularly definitive. I have 2017 1LE and just went to a square 305 setup on 10.5 x 19 Apex wheels and they are wearing RT660 tires. I am headed to Watkins next week and wanted to see if anyone had a good starting place for hot pressures on a road course.

Thanks!

RamAir02 · 09-08-2022, 10:11 PM

I don't know those tires in particular, but with most street tires, you want to target 36-ish psi hot. You start lower since the psi will rise as you get heat into the tires. I'd probably try going out at 30 psi first session of the day and bleed off as necessary throughout the day.

Maybe someone who knows the characteristics of the RT660 will chime in.

Edit: There is also a dedicated road course subforum

sr71bb · 09-09-2022, 01:58 AM

Quote:

Originally Posted by RacerXnh10

Did some searching, wasn’t able to come up with anything particularly definitive. I have 2017 1LE and just went to a square 305 setup on 10.5 x 19 Apex wheels and they are wearing RT660 tires. I am headed to Watkins next week and wanted to see if anyone had a good starting place for hot pressures on a road course.

Thanks!

OK I run these alot at the track and 26psi COLD PRESSURE works best for me. You dont really want them to get over 33-34PSI pressure hot.

khcoaching · 09-09-2022, 05:24 AM

^^ Yes, this is spot on.

FlukeSS · 09-09-2022, 07:38 AM

Quote:

Originally Posted by RamAir02

I don't know those tires in particular, but with most street tires, you want to target 36-ish psi hot. You start lower since the psi will rise as you get heat into the tires. I'd probably try going out at 30 psi first session of the day and bleed off as necessary throughout the day.

Maybe someone who knows the characteristics of the RT660 will chime in.

Edit: There is also a dedicated road course subforum

My tires on street are at 30-32lbs warm, on strip 24-26lbs. Eagle F1 SC3

Obviously tires can vary not sure what the 660 would require.

MatthewAMEL · 09-09-2022, 09:02 AM

660s like pressure. I just ran at Sebring last weekend and with 85-93F ambient, started them at 29psi. They came up to 36psi by the end of the session.

I start the SC3's lower, 27-28psi, depending on ambient.

Chippy · 09-09-2022, 10:45 AM

I’m always starting out at around 26psi on the SC3,s and then keep close as can to 32 from there. Tires are wearing nicely.

DaveC113 · 09-09-2022, 11:12 AM

I run 32/28 for autox but this only works with a stiffer front bar and a lot of camber. With a stock setup you'd want a good bit more pressure, I'd agree with somewhere around 35 hot.

RT660 are really autox/TT tires. They warm up super fast, like just a few corners, and are very grippy but will fall off rapidly at higher temps. I was just at High Plains in CO and a friend with an M3 was not having a great time with them running 25 min sessions, although temps were in the 90's. IMO it's really hard to beat the OEM tires unless you want to go with the SC3R or some other ~100 tw R comp tire. My SC3s were excellent and maintained good grip even towards the end of a 25 min session at 95 degrees.

09-08-2022, 07:44 PM	#1
RacerXnh10 Drives: 2017 Camaro 1LE Join Date: Nov 2021 Location: NH Posts: 23	RT660 track pressures? Did some searching, wasn’t able to come up with anything particularly definitive. I have 2017 1LE and just went to a square 305 setup on 10.5 x 19 Apex wheels and they are wearing RT660 tires. I am headed to Watkins next week and wanted to see if anyone had a good starting place for hot pressures on a road course. Thanks! Attached Images

09-08-2022, 10:11 PM	#2
RamAir02 Shadow Gray '19 ZLE M6 Drives: '19 ZL1 1LE M6 Join Date: Apr 2009 Location: NJ Posts: 1,440 View My Garage	I don't know those tires in particular, but with most street tires, you want to target 36-ish psi hot. You start lower since the psi will rise as you get heat into the tires. I'd probably try going out at 30 psi first session of the day and bleed off as necessary throughout the day. Maybe someone who knows the characteristics of the RT660 will chime in. Edit: There is also a dedicated road course subforum __________________ 2019 ZL1 1LE \| M6 \| SGM \| PDR \| CF Dash \| Nav \| Wheel Locks PPF \| Paint Correction \| ZL1 Addons Rock Guards \| ZL1 Addons Lift Pads \| ZL1 Addons Feather Lite Tow Hook \| JWM Smoked Sidemarkers \| Wildhammer Smoked Rear Reflectors \| JWM License Plate LEDs \| RotoFab CAI \| ADM IC Reservoir v2 \| BC Forged RZ05 \| SPL Toe Arms \| BW Brake Deflectors \| CMS Roll Bar \| Schroth Profi II ASM Harnesses . Sold: '99 Trans Am (bolt-ons & cam) \| '00 WS6 (bolt-ons, heads, cam, 12 bolt) \| '05 CTS-V (bolt-ons, short throw) \| '10 SS/RS M6 (short throw, CAI, coilovers, LTs, catback, JRE tune) \| '01 WS6 YouTube

09-09-2022, 05:24 AM	#4
khcoaching Drives: 2021 1SS 1LE Join Date: Nov 2020 Location: 98548 Posts: 609	^^ Yes, this is spot on. __________________ Follow my build - https://www.camaro6.com/forums/showthread.php?t=594295

09-09-2022, 09:02 AM	#6
MatthewAMEL Drives: 2023 CT5 Blackwing Join Date: Sep 2016 Location: Orlando Posts: 1,617	660s like pressure. I just ran at Sebring last weekend and with 85-93F ambient, started them at 29psi. They came up to 36psi by the end of the session. I start the SC3's lower, 27-28psi, depending on ambient. __________________ 2017 HBM SS 1LE Sold 2023 Wave Metallic CT5-V Blackwing M6

09-09-2022, 10:45 AM	#7
Chippy BanHamWatch Drives: 21 ZL1 1LE Join Date: Jan 2021 Location: Calgary, Alberta Posts: 248	I’m always starting out at around 26psi on the SC3,s and then keep close as can to 32 from there. Tires are wearing nicely. __________________ 2021 ZL1 1LE Auto

09-09-2022, 11:12 AM	#8
DaveC113 Drives: 2018 Camaro 1SS 1LE Join Date: Sep 2018 Location: Front Range, CO Posts: 1,859	I run 32/28 for autox but this only works with a stiffer front bar and a lot of camber. With a stock setup you'd want a good bit more pressure, I'd agree with somewhere around 35 hot. RT660 are really autox/TT tires. They warm up super fast, like just a few corners, and are very grippy but will fall off rapidly at higher temps. I was just at High Plains in CO and a friend with an M3 was not having a great time with them running 25 min sessions, although temps were in the 90's. IMO it's really hard to beat the OEM tires unless you want to go with the SC3R or some other ~100 tw R comp tire. My SC3s were excellent and maintained good grip even towards the end of a 25 min session at 95 degrees. __________________

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