12-07-2018, 10:28 AM | #1 |
BigShow
Drives: 2017 1 Camaro + Chevy Avalanche Join Date: Oct 2014
Location: Tucson
Posts: 335
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Loose on the Track
I was on the Main Wild Horse Pass track last weekend. This was my second time on this trak, two days last year and two days this year. There a decreasing radius turn after a long straight (139 MPH). Last year I could floor the car at the apex. This year the rear end stepped out on the first lap and a few others. I had one of the instructors drive it for a few laps, he thought it was loose as well. I kind of lost confidence in the car in the turns and didn't push hard. There were a number of other 1LEs out there, some of the better times were 3 s faster than my best. I'm sure that two of those drivers are more experienced and better drivers.
I added the OEM wicker bill this year. Differences from last year, 10 degree or more cooler day. Last year the tires were new, 2,000 street miles. This year the front tires were pretty new, I think one prior track day and some street mies. The rear tires are at end of life, last track day. Could the difference in front to back tread depth impact the handling. Could the difference in tire age impact the handling? I'm sure temperatures made a difference, but there were other cars out there without this issue. |
12-07-2018, 10:40 AM | #2 |
Drives: 2017 SS 1LE Join Date: Sep 2011
Location: Los Angeles
Posts: 154
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12-07-2018, 10:43 AM | #3 |
Drives: '18 Black SS 1LE; '01 Corvette Z06 Join Date: Nov 2018
Location: Lehigh Valley, PA
Posts: 119
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I would say new(er) tires on the front and old (end of life) tires on the rear magnifies the over-steer (edit) issue. Many tires lose their ability to provide maximum grip long before the tread passes the wear bars and if you have good grip with newer tires on the front and low grip with older tires on the rear you're definitely going to notice a "loose" condition.
Last edited by Jimbeau11; 12-07-2018 at 11:21 AM. |
12-07-2018, 11:03 AM | #4 | |
Drives: 2017 SS 1LE Join Date: Mar 2016
Location: Monterey, CA
Posts: 2,474
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Quote:
This right here, except I think you meant to say over-steer. The 1LEs are engineered with a slight bias toward under-steer which makes them very easy to control right up to the limit. I would say your over-steer issues on that day is 100% attributable to the tires, new fronts=more grip, old rears=less grip, more front grip than rear grip=over-steer, case closed. I would say it's time for some new rears and you will go right back to enjoying your car on track with full confidence!
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12-07-2018, 11:19 AM | #5 | |
Drives: '18 Black SS 1LE; '01 Corvette Z06 Join Date: Nov 2018
Location: Lehigh Valley, PA
Posts: 119
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12-07-2018, 12:36 PM | #6 |
BigShow
Drives: 2017 1 Camaro + Chevy Avalanche Join Date: Oct 2014
Location: Tucson
Posts: 335
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Thanks guys. I have another set of rims and tires that I'm dedicating for track use. I would have used them but I damaged a tire and bent a rim going two wheels over on the curbing, the new rim/tire shipped the Friday before track day. The dedicated track setup is squaring - 305s all round which might lead to oversteer but I didn't feel like I experienced that at on the Bondurant course.
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12-07-2018, 01:06 PM | #7 | |
Drives: 2017 SS 1LE Join Date: Mar 2016
Location: Monterey, CA
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Quote:
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12-07-2018, 08:11 PM | #8 |
BigShow
Drives: 2017 1 Camaro + Chevy Avalanche Join Date: Oct 2014
Location: Tucson
Posts: 335
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My track set are the RE71Rs. I wanted RS4s but they were out of stock.
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12-07-2018, 08:16 PM | #9 |
Drives: 2019 ZL1 1LE Join Date: Feb 2017
Location: Gilbert, AZ
Posts: 648
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Hey, I saw you there, I was there helping my friend run in the enduro event on Sunday.
I just went through the exact same thing as you. Car was loose as hell at Inde Ranch, got new tires, car is back to normal. It got to the point where I could spin the tires in 2nd gear if I just stepped on it, and they still had plenty of meat on the outside shoulders. Get new tires, trust me
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