Scrublines on SC3's - Page 2

GunMetalGrey · 06-18-2019, 01:52 AM

Quote:

Originally Posted by TrackClub

Yes indeed. Immediately after you park after a session, check all 4 tires with a reliable gauge. I like Longacre brand. If you see any pressures above recommended max hot - bleed them to recommended hot. Repeat the procedure after each session. At the end of the day, dont forget to check cold pressure for drive home as you may be much less than recommended 32 and need to add some.

Personally i start at 28 cold so the tires dont take much to "come in" usually a lap or two max. Then i keep them at 36 hot. A bit higher is ok too and will depend on how far the scrub line extends to the outside of the shoulder. If it goes beyond the little GoodYear symbol you may have to run it a bit higher, try 1-2 psi. If the wear is short then reduce.

This may depend on a track, as well as how much you slide the car, etc. Either way i dont go much below 36 with G3s. Cheers!

Thanks!

driven2exceSS · 06-18-2019, 09:15 AM

Quote:

Originally Posted by GunMetalGrey

Thanks for that info, I'm looking forward to seeing what my temps are at VIMSC.

What pyrometer unit will you be using?

carguy55 · 06-20-2019, 06:56 PM

I've tried 36 hot and still too far away from the Goodyear symbol. I'm trying 34-36 hot this weekend which is only going to be 95 at COTA. For sure you want a accurate pressure gauge to use. The Longacre one I have is +/-0.2 psi

driven2exceSS · 06-20-2019, 07:16 PM

Mmmm IDK think that is too low. Maybe the track you're on too, and tires not being pushed to roll as much. Likely they will get rather greasy pretty quick. I've been told before not to adjust for tire "wear" based on air pressure alone!! That means you will need a pyrometer probe, not just a air pressure gauge. This will tell you if your alignment specs and pressures are appropriate for your driving style for that particular track. The next track will most likely be needing different specs, but most of us can not afford to deal with such particulars to that level.

GunMetalGrey · 06-23-2019, 10:21 PM

Quote:

Originally Posted by driven2exceSS

What pyrometer unit will you be using?

My mistake, meant pressure.

What meter do you recommend if I want to start measuring tire temps?

ZapperZ · 06-24-2019, 08:03 AM

Front 39psi hot
Rear 37psi hot

Sounds like a lot of pressure but worked very well for me

Snakebt6 · 06-24-2019, 08:19 AM

Based on scrub lines alone this tire (Left Front) is over inflated, the pressure was right at 38 and I saw 39 occasionally. So id imagine if I was at 37 ( I believe that's the recommended hot pressure for RC driving) It would be right at the top of the wing or pretty close.

It was really hot that day by the way and started with 30 PSI.

TheRealJA105 · 06-24-2019, 08:42 AM

I see feathering all the way into the lettering on my front SC3s. I know the pic doesn't show the sidewall, but look at the outside edges. You guys can push so much harder...

driven2exceSS · 06-24-2019, 10:37 PM

Quote:

Originally Posted by GunMetalGrey

My mistake, meant pressure.

What meter do you recommend if I want to start measuring tire temps?

Sorry for delay been up at Mont Tremblant and spotty service. I honestly do not know what pyrometer to recommend. I have a cheap infrared one, and I had a guy that does my track alignment check mine with a probe pyrometer at my last event to check the latest alignment spec's and wear. Sorry!! I'll ask what unit he is using tomorrow...

TrackClub · 06-24-2019, 11:56 PM

Quote:

Originally Posted by TheRealJA105

I see feathering all the way into the lettering on my front SC3s. I know the pic doesn't show the sidewall, but look at the outside edges. You guys can push so much harder...

Agree!

TrackClub · 06-25-2019, 12:00 AM

Quote:

Originally Posted by driven2exceSS

Sorry for delay been up at Mont Tremblant and spotty service. I honestly do not know what pyrometer to recommend. I have a cheap infrared one, and I had a guy that does my track alignment check mine with a probe pyrometer at my last event to check the latest alignment spec's and wear. Sorry!! I'll ask what unit he is using tomorrow...

My fave venue

Have bags of fun!
NB i did have a "proper" pyrometer. Never left the box lol!
I find managing by pressure and wear marks to be completely reliable. Imo anyway.

TheRealJA105 · 06-26-2019, 02:16 PM

No wings left here! Still running these tires btw.

TRZ06 · 06-26-2019, 03:57 PM

Quote:

Originally Posted by TheRealJA105

No wings left here! Still running these tires btw.

Do you risk a blowout if you run tires much past the cords showing?

Badmojo · 06-26-2019, 04:17 PM

I run:

Front 26 PSI Cold
Rear 27 PSI Cold
Track alignment per track supplement.

Target is 35 PSI hot.

GY SC 3's will wear closer to the sidewall mark as they wear down. The tires start square and will round the outside edge after 5+ track days.

06-20-2019, 07:16 PM	#18
driven2exceSS Drives: 2016 2SS BLK A8 Vert Join Date: Dec 2017 Location: MA Posts: 1,029	Mmmm IDK think that is too low. Maybe the track you're on too, and tires not being pushed to roll as much. Likely they will get rather greasy pretty quick. I've been told before not to adjust for tire "wear" based on air pressure alone!! That means you will need a pyrometer probe, not just a air pressure gauge. This will tell you if your alignment specs and pressures are appropriate for your driving style for that particular track. The next track will most likely be needing different specs, but most of us can not afford to deal with such particulars to that level. __________________ NPP, MRC, Tinted side & rear reflectors, OEM ZL1 Rockers / 3rd Brake / Darken tail lights, OEM Blk rear splash guards, Satin hood wrap, Fuse pull, Sound tube delete, Cat delete, Ported 95 TB, Ported MSD IM, Dry RotoFab, ARH 1 7/8 headers, E85, "Performance Dyno" Tune, BMR "pieces", "Track" alignment, Hawk DCT-70/70's w/SRF, Goodridge lines, Ti shims, Red powdered calipers, 18" APEX SM-10's w/ Pirelli DH's, FE4 Vert swaybars, Brake cooling ducts, ATI 10% UD, Vorshlag camber plates, OEM 1LE Splitter w/APR Ext., Velossa BIG MOUTH Ram Air, CF QA1, ZLE brakes(F)

06-24-2019, 08:19 AM	#21
Snakebt6 Drives: Rally Green 2020 ZL1 1LE A10 Join Date: Jul 2018 Location: Jacksonville Florida Posts: 402	Based on scrub lines alone this tire (Left Front) is over inflated, the pressure was right at 38 and I saw 39 occasionally. So id imagine if I was at 37 ( I believe that's the recommended hot pressure for RC driving) It would be right at the top of the wing or pretty close. It was really hot that day by the way and started with 30 PSI. Attached Images

06-24-2019, 08:42 AM	#22
TheRealJA105 Drives: 2013 C6Z06 Join Date: Nov 2016 Location: PA Posts: 1,577	I see feathering all the way into the lettering on my front SC3s. I know the pic doesn't show the sidewall, but look at the outside edges. You guys can push so much harder... Attached Images

06-26-2019, 02:16 PM	#26
TheRealJA105 Drives: 2013 C6Z06 Join Date: Nov 2016 Location: PA Posts: 1,577	No wings left here! Still running these tires btw. Attached Images

06-26-2019, 04:17 PM	#28
Badmojo aka BeastZL1 Drives: 2019 Camaro ZL1 1LE, 2004 Cobra Join Date: Dec 2017 Location: NC Posts: 1,103	I run: Front 26 PSI Cold Rear 27 PSI Cold Track alignment per track supplement. Target is 35 PSI hot. GY SC 3's will wear closer to the sidewall mark as they wear down. The tires start square and will round the outside edge after 5+ track days. __________________ 2019 Camaro ZL1 1LE Racing for ALS Youtube Link

06-20-2019, 06:56 PM	#17
carguy55 Drives: 2018 1SS 1LE Join Date: Feb 2017 Location: Austin, Texas Posts: 1,487 View My Garage	I've tried 36 hot and still too far away from the Goodyear symbol. I'm trying 34-36 hot this weekend which is only going to be 95 at COTA. For sure you want a accurate pressure gauge to use. The Longacre one I have is +/-0.2 psi

06-24-2019, 08:03 AM	#20
ZapperZ Drives: 2018 ZL1 1LE 2022 GMC AT4 HD Join Date: Dec 2014 Location: Valparaiso,Indiana Posts: 284	Front 39psi hot Rear 37psi hot Sounds like a lot of pressure but worked very well for me

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