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Old 11-11-2012, 08:50 PM   #1
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305 rear tires???

Still at least a month before my car gets here, but first thing I'm installing is the 305 tires in the rear. Reason I'm doing it as soon as it lands is because I dont want to put any miles on the 285's, so then I can sell them for a reasonable price. I work at Runde Chevrolet in East Dubuque, IL so I get a pretty good deal on them as I do the ZL1 skirts and diffuser, which will be 2nd install, headers and CAI 3rd. So if anyone has their rear tires burnt off in a month, I'll have a pair for sale!!! Anyone else doing the same? I know the car is designed to run that tire in the rear, but mainly for the roadcourse, which I may never see. I love a meaty tire in the rear!!
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Old 11-11-2012, 09:10 PM   #2
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Thinking also about putting the bigger tire and side skirts.
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Old 11-11-2012, 09:12 PM   #3
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Why dont you store the tires because the front will eventually wear out. You wont get as much out of them to replace them down the road.
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Old 11-11-2012, 09:18 PM   #4
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That is my intention, keep them and put them on front when replacing is needed up there. Also have the dealer installing the side rockers the day it arrives.
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Old 11-11-2012, 09:55 PM   #5
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Larger rears will affect understeer unless you change to ZL1 or aftermarket sway bars.
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Old 11-11-2012, 10:04 PM   #6
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Won't need to worry about understeer too much since I wont be racing it at an autocross.
I do all of my own wrenching, so I'll be installing the skirts and diffuser myself.
I can buy the tires pretty much at cost and it's gonna be a couple years before I'll need front tires, so whatever I get for them will help pay for the 305's.
Sooo anxious!!!
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Old 11-20-2012, 07:52 PM   #7
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putting 315s on mine for winter
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Old 11-20-2012, 08:04 PM   #8
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Can we put the 305/315's on our stock 11" rears?
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Old 11-20-2012, 08:04 PM   #9
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Can we put the 305/315's on our stock 11" rears?
Yes...
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Old 11-20-2012, 08:06 PM   #10
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Sweeeeeeeeeet!
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Old 11-20-2012, 08:07 PM   #11
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Quote:
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Larger rears will affect understeer unless you change to ZL1 or aftermarket sway bars.
The rear tire stretched across the 11" wheel looks bad to me, I am putting on Forgeline wheels with NT-05's 275/40-20's on the front and 315/35-20 on the rear....will post pictures when I get them on...
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Old 11-20-2012, 08:09 PM   #12
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Please do.
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Old 11-21-2012, 07:40 AM   #13
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putting 315s on mine for winter
Why are you going wider in the rear for winter, you will get less traction? Narrower is better for winter and snow. Pressure equals force over area. If you go narrower your contqct patch area is smaller, ur force is same because that is weight of vehicle. Hence, ur pressure on the contact patch is higher now which is good in slippery situations. Ur drag is also lower in deep snow with the narrower tire, providing better stability.
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Old 11-21-2012, 08:38 AM   #14
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Threads like this make me envision a GM engineer that worked on the 1LE package reading this and screaming at his monitor.

You guys are not concerned with upsetting the balance of the car? It would be interesting to have a skidpad done on the car with the square setup Vs 305s on the back.
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Old 11-21-2012, 11:14 AM   #15
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Quote:
Originally Posted by So Cal Camaro View Post
The rear tire stretched across the 11" wheel looks bad to me, I am putting on Forgeline wheels with NT-05's 275/40-20's on the front and 315/35-20 on the rear....will post pictures when I get them on...

WHAT??? FORGELINE WHEELS.... wow.... oh well...
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Old 11-21-2012, 11:15 AM   #16
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Quote:
Originally Posted by Mgizzle View Post
Why are you going wider in the rear for winter, you will get less traction? Narrower is better for winter and snow. Pressure equals force over area. If you go narrower your contqct patch area is smaller, ur force is same because that is weight of vehicle. Hence, ur pressure on the contact patch is higher now which is good in slippery situations. Ur drag is also lower in deep snow with the narrower tire, providing better stability.
, agreed.
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Old 11-21-2012, 01:00 PM   #17
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Quote:
Originally Posted by BlackinBlack View Post
Threads like this make me envision a GM engineer that worked on the 1LE package reading this and screaming at his monitor.

You guys are not concerned with upsetting the balance of the car? It would be interesting to have a skidpad done on the car with the square setup Vs 305s on the back.
No, if they really wanted a square set up done right, they should have used 10" wheels all around, the 285 stretched across the 11" wheel looks awful and looks like it is going to wear the tire quickly...I'll get the ZL1 Pedders or Pfadt rear sway bar, it'll be good when I'm done with it...
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Old 11-21-2012, 01:26 PM   #18
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Originally Posted by So Cal Camaro View Post
No, if they really wanted a square set up done right, they should have used 10" wheels all around, the 285 stretched across the 11" wheel looks awful and looks like it is going to wear the tire quickly...I'll get the ZL1 Pedders or Pfadt rear sway bar, it'll be good when I'm done with it...
So your saying the engineers at Chevrolet did not use the correct approach?
That your approach is better and will give the Camaro better times? Im interested in this, how much more money will this cost.
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Old 11-21-2012, 02:37 PM   #19
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So your saying the engineers at Chevrolet did not use the correct approach?
That your approach is better and will give the Camaro better times? Im interested in this, how much more money will this cost.
I think if the square approach was the best way, why isn't it used on the ZL1? And yes, I don't like their approach to stretch the tire on the rear that much...best part is this is my Camaro and I'll mod it the way I want it...
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Old 11-21-2012, 03:54 PM   #20
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The reason it is not square on the zl1 is because it has torque everywhere, all the time, and putting anything more than 285 in the front will be undrivable steering wise.
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Old 11-21-2012, 05:00 PM   #21
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The reason it is not square on the zl1 is because it has torque everywhere, all the time, and putting anything more than 285 in the front will be undrivable steering wise.
You do realize we are talking about a mere 1" of tire width difference between a 285 and 305, hardly a big difference....
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Old 11-21-2012, 05:15 PM   #22
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Quote:
Originally Posted by Mgizzle View Post
Why are you going wider in the rear for winter, you will get less traction? Narrower is better for winter and snow. Pressure equals force over area. If you go narrower your contqct patch area is smaller, ur force is same because that is weight of vehicle. Hence, ur pressure on the contact patch is higher now which is good in slippery situations. Ur drag is also lower in deep snow with the narrower tire, providing better stability.
90% of the reason is not bc I think wider is better bc that's not the case. It's well known that the 1LE stock tires are HORRIBLE in cold weather and they won't last too long.

I'm mainly doing it for two reasons:
1: Save tread for my stockers for next year
2: The Continentals I got are high performance ALL WEATHER tires and have stellar reviews and will only use throughout the winter
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Old 11-22-2012, 07:00 PM   #23
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From what I've read about the ZL1 Goodyears, the front 285's were designed to reduce understeer in the car, while the rear 305's were designed to gain traction on launch and put all of the ZL1's torque to the ground. The reason for having the 285's on all 4 corners was to further reduce understeer in the SS/1LE. Since the LS3 doesn't put out the torque of the LSA, there's not as much benefit to the rear tire tread.

All-in-all I'm extremely happy with the 285's all around. The rears don't look nearly as bad as some people say they do stretched over the 11" wheels. I think I've had 1 person even notice it so far.
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Old 11-22-2012, 09:42 PM   #24
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Originally Posted by So Cal Camaro View Post
I think if the square approach was the best way, why isn't it used on the ZL1? And yes, I don't like their approach to stretch the tire on the rear that much...best part is this is my Camaro and I'll mod it the way I want it...
Have you listened to Al Openheisser's explanation? They don't want too much traction on the rear.

"The reason (we stretched the same sized zl1 front tire on an 11" rear wheel) is that this is a track car. And for track you don't necessarily want to push that tire patch down by having downforce or too much grip in the back. It's contrary to trying to fix the understeer. We wanted to loosen up the slip and allow you to ring this thing out because in competitive mode this thing is a track car."

http://m.youtube.com/watch?v=16nyCdbVdM8

Good luck with your overrides. Let us know if you have another method of fixing the understeer.
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Old 11-23-2012, 10:45 AM   #25
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Whatever, unless any of you have the driving skill of a Danny Popp or Mark Stielow, I seriously doubt your going to ring out this thing out to that point...

I am going to experiment with this Camaro until I get it where I want it...coilovers coming in the near future, bushings will be upgraded, CTSV front brakes and then lots of practice and adjustments till this Camaro reacts the way I want it too...

I am happy all you guys or girls are happy with your stock Camaro, but to quote Jesse James, "stock sucks"
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