11-13-2017, 09:18 PM | #1 |
Drives: 2017 SS 1LE Join Date: Aug 2017
Location: NC
Posts: 63
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RE71Rs for the front and RE11s on the rear
Hey guys, wondering if anyone has attempted or has some good knowledge on why or why not to run 2 different brands for autocross. Im looking at doing 305/19 RE 71Rs on the front of my 1LE and 325/19s RE 11s on the rear.
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11-13-2017, 09:30 PM | #2 |
Drives: Cayman S or Borrowed 17 1SS 1LE Join Date: Apr 2017
Location: Stafford
Posts: 42
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Bad idea mix matching those two tires because of the difference in grip. Run the 305/30/19 71r all around
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11-13-2017, 09:32 PM | #3 |
Hot Dog
Drives: '17 1SS 1LE Join Date: Feb 2016
Location: Metro Detroit
Posts: 1,937
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You'll have more grip with 305 RE71R's on the back than you will with any width RE11. That's why the RE11's were replaced by the RE71R's.
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2017 "M1SS1LE" in Hyper Blue w/PDR
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11-13-2017, 09:39 PM | #4 | |
I used to be Dragoneye...
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What are you hoping to achieve? |
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11-13-2017, 10:18 PM | #5 | |
Drives: 2017 SS 1LE Join Date: Aug 2017
Location: NC
Posts: 63
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Ok this is what i was wondering. 305s were my original plan, but saw these 325 re11s and were pretty tempted |
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11-13-2017, 10:30 PM | #6 |
@zle_blackwing
Drives: 2018 ZL1 1LE Join Date: Mar 2017
Location: S OC
Posts: 1,390
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I’ve had both and the RE71Rs are head and shoulders above the RE11s. I wouldn’t do it just based on size.
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2018 ZL1 1LE - Red Hot, Nav, PDR
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11-14-2017, 07:14 AM | #7 | |
I used to be Dragoneye...
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Different tires could make the car unpredictable. |
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11-14-2017, 07:40 AM | #8 |
corner barstool sitter
Drives: 08 Mustang GT, 19 WRX Join Date: Jul 2012
Location: Eastern Time Zone
Posts: 6,990
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Attempting to solve an understeer problem by playing games with the basic front vs rear slip angle curves is not only risky; it can hurt you in other places (if the rear insists on being a lot looser the car can get "out of step with itself", typically in slaloms).
I've seen an extreme example of what you're suggesting . . . and it flat-out should not have been permitted to pass tech inspection. Norm
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'08 GT coupe 5M (the occasional track toy)
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11-14-2017, 09:15 AM | #9 | |
Hot Dog
Drives: '17 1SS 1LE Join Date: Feb 2016
Location: Metro Detroit
Posts: 1,937
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Quote:
Let's start with the obvious: what's your alignment? If you're not at a minimum at the Performance Supplement "track" alignment, then you're behind the 8-ball. Even then, tire wear on this platform is proving to be shoulder-heavy even with neutral balance.
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2017 "M1SS1LE" in Hyper Blue w/PDR
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11-14-2017, 09:41 AM | #10 |
Drives: 2017 Hyper Blue A10 ZL1 Join Date: Dec 2016
Location: New England
Posts: 716
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I was getting outside tire wear as well, but the regular ZL1 cannot get as much negative camber as you can without non-stock components. You probably need more.
The car shouldn't plow if you are not bombing into to the corners. I also would think alignment. I had one car that I got brand new that just didn't have non-optimal configurations for racing, but had different camber, toe, etc on every wheel. It was a hot mess until I got it fixed up for racing. I wondered how they could ship it like that, but....
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11-14-2017, 09:41 AM | #11 |
Drives: ZL1 1LE Join Date: Sep 2017
Location: Bay Area
Posts: 104
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I've mixed tires once without any ill affect but would not do it as a rule. The RE11 and RE71R are probably different enough that I would not recommend it.
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11-14-2017, 10:02 AM | #12 | |
"M1SS1LE"
Drives: 2017 SS 1LE Join Date: Dec 2015
Location: Upstate SC
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11-14-2017, 10:48 AM | #13 |
Drives: 22 1SS 1LE Summit White Join Date: Sep 2016
Location: Milwaukee WI
Posts: 1,144
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yeah there are so many other things you can do before changing tires front to rear.
Having different tires from front to back in theory would work like youre thinking but people have tried it with little success. I played around with tire sizes and that seemed to help me with turn in.
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11-14-2017, 01:59 PM | #14 |
Drives: 71 Camaro '18 1LE Join Date: Feb 2016
Location: Beach Park, IL
Posts: 68
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OP, are you new to autocross?
Where does the car push? On entry, mid corner, or on exit?
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Donny
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