05-18-2019, 08:59 AM | #1 |
Drives: 2017 Camaro 1SS M6 Join Date: Apr 2015
Location: Indy
Posts: 2,460
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Thoughts on this 285 square setup using stock SS wheels
I'm considering the following setup using stock SS rear wheels and SS 1LE front tires at all 4 corners. Anyone run something similar on track (road course) or autocross? How much would I be leaving on the table compared to just going with the SS 1LE wheel/tire combo front and rear (285/305)? I'm interested in feedback from folks running a square setup if the balance or handling was compromised. I like the stock SS split spoke machined face gray painted wheels, but just wanted a more aggressive setup (closer to SS 1LE).
Front/Rear:
My main concerns would be the suspension tuned for the staggered setup and deviating from that. The other concern is the rev/mile difference (~3%) if there's no way to correct the speedometer.
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2017 Camaro 1SS, M6, Hurst shifter, Hyper Blue, NPP, Gray Split Spoke Wheels
Best 1/4 Mile: 12.24 @ 115.9 mph |
05-18-2019, 01:00 PM | #2 |
Drives: 2017 1SS 1LE Join Date: Jun 2016
Location: Detroit, MI
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Switching to wider fronts like that will give the car a natural tenancy to oversteer rather than the nearly neutral characteristics it has with the OE tires and track alignment. There's a couple of ways to compensate for that with suspension component and/or alignment changes, though.
I wouldn't be concerned about the speedo that much. 3% is ~2 mph at highway speeds. There is a way to correct through a tune, but not worth going through that whole process for only a speedo change when it's not that far off IMO. Lastly, with a front spacer that big, you're going to want longer wheel studs since the OE ones won't have enough thread engagement. I'd assume ARP makes some that are 12-ish mm longer, but I believe the wheel studs from the Silverado are also the same material grade as the camaro but longer. Personally, if it's feasible for you, I'd recommend going with a separate set of 19" wheels and tires for track use and keep your current OE wheels with less aggressive tires for street and wet track use. 19" 305 square setup is pretty easily accomplished, you'll have a better selection of tires to choose from in that size for the track, and you don't have to make any sacrifices for driving on the street.
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05-18-2019, 03:51 PM | #3 |
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If you can fit 285, why not. That's my daily setup.. going on 11,000+ miles.
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05-19-2019, 09:57 AM | #4 | ||
Drives: 2017 Camaro 1SS M6 Join Date: Apr 2015
Location: Indy
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Quote:
See 9:14 in this video for his comments: Regarding the 12mm spacers, I'd definitely replace the studs and would plan to use them both front and rear in order to push all wheels out 12mm compared to the stock setup. It's only needed in the front though for clearance. Thanks for the recommendation on a 19" setup. I will look into that. Thanks. According to Goodyear, the 285s fit on a 9.5" wide wheel. Based on the table calculations above, they should fit within the window of current tire size offerings on the SS.
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2017 Camaro 1SS, M6, Hurst shifter, Hyper Blue, NPP, Gray Split Spoke Wheels
Best 1/4 Mile: 12.24 @ 115.9 mph Last edited by vtirocz; 05-19-2019 at 12:37 PM. |
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05-19-2019, 03:06 PM | #5 | |
Drives: 2017 1SS 1LE Join Date: Jun 2016
Location: Detroit, MI
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Quote:
I wouldn't put the spacers in the rear. The spacers up front will make the rear wheels closer to the original offset of the front tires, and therefore keep the center of the contact patch (and front trackwidth) the same as it is OE. Spacers on the rear will slightly increase the rear trackwidth and will impact how the car handles. Will also change loading for your wheel bearings because the contact patch is moved further outboard, and compounded with stickier tires could cause bearings to wear faster.
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05-20-2019, 04:02 AM | #6 | |
Drives: 2017 Camaro 1SS Join Date: Aug 2016
Location: NH
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Quote:
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05-20-2019, 12:45 PM | #7 |
ITCRNRS
Drives: 2018 ZL1 1LE Join Date: Jun 2012
Location: Wichita KS
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I run a square set up for my autocross set up and my trackday set up and the car still favors oversteer even with the rear sway bar on the softest setting.
Current autocross set up 19x11 with 305 RE-71r's 19x12 with 305 RE-71r's Current trackday set up 19x10 with 325's (cheap set of summer coopers) 19x11 with 325's
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05-20-2019, 01:07 PM | #8 |
Drives: 2016 1SS Join Date: May 2016
Location: Syracuse
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I found the stock setup to be understeer biased. Went to 19x10 with 275s square and found the car to be neutral. Went through a set of rs3s, Star specs, and 595rsrr (terrible tire). Will continue with the square setup.
I also have MRC. Last edited by TheMaGikDucK; 05-20-2019 at 01:08 PM. Reason: Autocorrect |
05-20-2019, 07:37 PM | #9 | |
Drives: 2017 Camaro 1SS M6 Join Date: Apr 2015
Location: Indy
Posts: 2,460
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Quote:
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2017 Camaro 1SS, M6, Hurst shifter, Hyper Blue, NPP, Gray Split Spoke Wheels
Best 1/4 Mile: 12.24 @ 115.9 mph |
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05-20-2019, 07:38 PM | #10 |
Drives: 2017 Camaro 1SS M6 Join Date: Apr 2015
Location: Indy
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Thanks! Just to clarify, did you have the track alignment or street alignment?
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2017 Camaro 1SS, M6, Hurst shifter, Hyper Blue, NPP, Gray Split Spoke Wheels
Best 1/4 Mile: 12.24 @ 115.9 mph |
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