04-10-2017, 12:34 PM | #155 |
Drives: 2017 Camaro 1SS 1LE Join Date: Jan 2017
Location: Plano, Texas
Posts: 267
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Hey guys I just wanted to follow up because earlier when we were having the staggered vs square setup "discussion" someone brought up having talked to an engineer who worked with GM and paraphrased him as saying essentially that if it comes staggered from factory its for a reason. I reached out and contacted that person directly for a little more in depth explanation and this was the response that I got.
The main reason that GM started using the staggered set up was that the large tires on the front cause significant wander and camber steer. Using large tires on the rear with a smaller front gives the vehicle stability and better steering precision. With high powered cars, the rear needs to be big enough to handle the power, but if the same large size is used on the front, the above items I listed will suffer. It has nothing to do with DOT. This is the manufacturers decision. If the stability and steering precision is not so important but performance is the highest priority then a square setup may have a better chance of achieving that. Often the rear size is just too big d=for the front or if used the styling would suffer. Since the car is balanced from the factory with staggered the road handling could suffer with a square setup unless changes are made to the suspension. Track handling may require changes as well. Autocross may like the square as stability is a much lower priority. Just wanted to post it here, I think it is an explanation that kind of supports us all being "right" about various things to varying degrees lol |
05-06-2018, 09:57 PM | #156 | |
Drives: 2018 1SS 1LE Join Date: Apr 2018
Location: Southern Maine
Posts: 24
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I've had 71R on my last 2 cars and they were night and day better than the OE tire, but neither of those cars had a decent tire out of the box either... I'm running against all the A Street Z06 guys and have to figure out how to give them some solid competition! If it can be done without swapping to 19 inch wheels, that would definetly be a bonus |
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05-06-2018, 10:56 PM | #157 | |
Drives: 2017 SS 1LE Join Date: Oct 2015
Location: San Ramon, Ca
Posts: 550
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05-07-2018, 12:49 AM | #158 |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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Agree. Both are incredibly close pace wise but seem to present different challanges based on my experience.
G3 wears out faster on the outside shoulder while RE71R seems to wear out quite a bit on the inside (2.6 camber). So longevity wise they seem the same imo. I did swap them L to R but frankly there was not enough life left for front to back rotation. Plus it isnt free if one cant just move wheels. Balance wise it is also very close if not identical as with 295 square the rake gets reduced which introduces more stability and pretty much the same balance as staggered. What i have also found is that with even just a tad shorter rear tire i had to upshift to 4th vs staying in 3rd on some tracks which robbed me of torque a bit. Lastly on high speed tracks like Mosport i could feel the rear not having as much grip. But just a wee bit even with lower rake. As far as steering precision and everything else the car felt exactly the same. So id say it is up to a personal preference, pricing and perhaps venues. |
05-07-2018, 06:41 AM | #159 |
Drives: 2018 1SS 1LE Join Date: Apr 2018
Location: Southern Maine
Posts: 24
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Thanks for the input guys! The car is more or less a dedicated autocross car, with the occasional trip out on the town for date night. Price difference between the G3 and 71R are marginal. I run a fully equipped shop, so flipping and swapping tires around is essentially free. I figured that the 71R was going to be the quicker tire on an autocross course, but glad to know that they're close. I suppose I just have to get more familiar with my new car to match the pace of the top AS drivers in they're vettes.
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05-07-2018, 08:48 AM | #160 | ||
Drives: E46 S54 race car, 964C2 Join Date: Feb 2017
Location: Southern Indiana
Posts: 912
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Overall, the RE71R is ~.5-1.0 seconds faster around a 90 second lap on track, again not a big difference. I will say that my experience was that my car had more front end grip with the RE71R/295 front. I never felt that the SS 1LE has any issue with understeer, but it generally does default to US at the limit (in most situations). With the 295 RE71R, that limit behavior isn't changed much, but the US limit is higher. Quote:
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05-07-2018, 12:31 PM | #161 |
Drives: 2018 1SS 1LE Join Date: Apr 2018
Location: Southern Maine
Posts: 24
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Again, great info. Thank you!
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05-07-2018, 03:40 PM | #162 | |
Hot Dog
Drives: '17 1SS 1LE Join Date: Feb 2016
Location: Metro Detroit
Posts: 1,937
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2017 "M1SS1LE" in Hyper Blue w/PDR
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