Oh no, TIRES again! R888R's or Cup 2 R's - Page 3

Z OH 6 · 06-05-2024, 03:48 PM

Quote:

Originally Posted by KamZL1

Can you run the 315/35/20 with no issues without modifications? and do you run G2 on the front?

Sure, run the G2s on the front, no issues there. 315/35/20 shouldn't be an issue either.

EDIT: 315/35/20 will not work, 315/30/20 will work.

2023_ZL1-AUTO · 06-05-2024, 04:50 PM

Quote:

Originally Posted by Z OH 6

Sure, run the G2s on the front, no issues there. 315/35/20 shouldn't be an issue either.

Z OH 6, would that size fit the non 1LE also does this require a speedo change in HP Tuners...

arpad_m · 06-05-2024, 07:14 PM

Quote:

Originally Posted by Z OH 6

Sure, run the G2s on the front, no issues there. 315/35/20 shouldn't be an issue either.

Are you sure? I run 305/35/20s in the rear and there is only a (camel) hair's breadth of clearance on the driver side with the already relocated main body harness... a 315 is even taller by a third of an inch...

Z OH 6 · 06-05-2024, 07:16 PM

Quote:

Originally Posted by 2023_ZL1-AUTO

Z OH 6, would that size fit the non 1LE also does this require a speedo change in HP Tuners...

I don't think it will work, 315/30/20 will though

Z OH 6 · 06-05-2024, 07:20 PM

Quote:

Originally Posted by arpad_m

Are you sure? I run 305/35/20s in the rear and there is only a (camel) hair's breadth of clearance on the driver side with the already relocated main body harness... a 315 is even taller by a third of an inch...

You may be right, when I originally replied, I was thinking about a 315/30/20, not a 35, but then I started thinking a few people have run a 315/35/20 but I could be wrong. It is quite a difference in tire height especially if the car is lowered.

arpad_m · 06-05-2024, 07:45 PM

Yup, 315/30/20 is a sweet spot. Too bad many tire options aren't manufactured in that size, including the Nitto 555RII or the Michelin Pilot Super Sport.

SHE'Z 18 · 06-05-2024, 08:00 PM

Not trying to Hijack the thread, but does anyone know the max 20” tire size for the Z’s?

From what I’ve read so far, it sounds like a safe size for the rear is 305/30/20.

But, what about the fronts, assuming no rubbing or mods?

Thanks everyone

Booher · 06-06-2024, 09:03 PM

I believe the ps4's can go up to a 315 on the rear of a zl1 and 295 on ss's, because they are smaller than most tires.

KamZL1 · 06-07-2024, 09:46 AM

Quote:

Originally Posted by SHE'Z 18

Not trying to Hijack the thread, but does anyone know the max 20” tire size for the Z’s?

From what I’ve read so far, it sounds like a safe size for the rear is 305/30/20.

But, what about the fronts, assuming no rubbing or mods?

Thanks everyone

i run 315 ps4s on my non 1le no problems. now my issue is, will I be giving up traction going from this to a stock size 555r2 because the 315/35/20 probably will not work without modification

Z OH 6 · 06-07-2024, 12:31 PM

Quote:

Originally Posted by KamZL1

i run 315 ps4s on my non 1le no problems. now my issue is, will I be giving up traction going from this to a stock size 555r2 because the 315/35/20 probably will not work without modification

Tire compound is FAR more important for traction than tire width. Your 315 PS4S's are no match for a 305 555R2.

KamZL1 · 06-07-2024, 12:54 PM

Quote:

Originally Posted by Z OH 6

Tire compound is FAR more important for traction than tire width. Your 315 PS4S's are no match for a 305 555R2.

good to know, I will be going with the 305s

45LongColt · 07-03-2024, 12:21 AM

Im running 325/30/ZR20 PS Cup 2 with 5mm spacer and no issues.

2023_ZL1-AUTO · 07-03-2024, 06:41 AM

Quote:

Originally Posted by 45LongColt

Im running 325/30/ZR20 PS Cup 2 with 5mm spacer and no issues.

Sweet!

Also update on my new R555R2's - These babies really hook up nice on the street so far! Pretty impressed so far. I didn't make it out to Tune and Test Evening at Summit/National Trails on 6/28, I really need to get this interchiller installed and get the IATs down when the days are hot here, >85°+ a lot lately! Going to find a nice cool morning and do a Dragy 60mph to 130mph and get a time/distance!

Megahurtz · 07-03-2024, 08:22 AM

Quote:

Originally Posted by 2023_ZL1-AUTO

Sweet!

Also update on my new R555R2's - These babies really hook up nice on the street so far! Pretty impressed so far. I didn't make it out to Tune and Test Evening at Summit/National Trails on 6/28, I really need to get this interchiller installed and get the IATs down when the days are hot here, >85°+ a lot lately! Going to find a nice cool morning and do a Dragy 60mph to 130mph and get a time/distance!

How do they feel taking corners or going fast when entering/exiting the highway ramps vs the SC3's?

06-05-2024, 07:45 PM	#34
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,450 View My Garage	Yup, 315/30/20 is a sweet spot. Too bad many tire options aren't manufactured in that size, including the Nitto 555RII or the Michelin Pilot Super Sport. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle Terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

07-03-2024, 12:21 AM	#40
45LongColt Drives: 2018 Zl1 Camaro Join Date: Feb 2018 Location: Gainesville, VA Posts: 149	Im running 325/30/ZR20 PS Cup 2 with 5mm spacer and no issues. Attached Images __________________ Big Gulp\|NW103\|SW Headers\|UHO CATS\|XPipe\|Borla Atak\|MM CC\|Kong Ported\|NSX\|ATI Damper\|DSX 9.45 Lower\|ZPE 2.5 Upper\|DM Tensioner\|FW Green Belt/BTR Gen V LT4 Cam w/32% lobe/BTR VVT Lockout/Pratt & Miller Chain/BTR Pushrods,Valve Springs, Retainers, Hydraulic Lifters & Guide Plate, Trunnion Roller\|Katech Valley\|KaTech Valve Covers\|MSD Coils\|DSX E Sensor & Aux Pump\|ICT Water Pump\|Katech Oil Pump\|Cordes & Mishimoto Expansion Tanks\|P3 Gauge\|LC-2 Wideband Sensor\|KaTech Wires\|DynoJet Tuned

06-05-2024, 08:00 PM	#35
SHE'Z 18 Drives: 18 ZL1 - M6 Join Date: Mar 2019 Location: MI Posts: 456	Not trying to Hijack the thread, but does anyone know the max 20” tire size for the Z’s? From what I’ve read so far, it sounds like a safe size for the rear is 305/30/20. But, what about the fronts, assuming no rubbing or mods? Thanks everyone

06-06-2024, 09:03 PM	#36
Booher Drives: 2019 zl1 6 speed Join Date: Jul 2017 Location: Lake Havasu Arizona Posts: 1,135	I believe the ps4's can go up to a 315 on the rear of a zl1 and 295 on ss's, because they are smaller than most tires.

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