socaljet

Although i never experienced it with either of my c6's i understand that a certain amount of what i term tire shudder is normal when the wheel is cut hard while backing up. Is there any why to determine when this is excessive as passengers have remarked unfavorably on several occasions in that they felt parts were being stressed unnaturally?
Does the z51 option make this effect more extreme?

theanswriz42

Search function, there are a ton of threads about this.

mksz51

Your passengers don't know what they are talking about. It is worse with the Z51 secondary to the tires that come with the Z51 package. Ackerman.

socaljet

A keyword to launch the search function please

CaryBob

The issue is a combination of wide tires, steering geometry (search "Ackerman"), and cold tires.

Any sharp, low-speed turn going forward or backward -- as into a parking slot-- will creat shudder or skipping of the tires. It will be more pronounced at low temperatures. If you had a C6 GS or Z06 you would have noticed it. The Z51 is more noticeable because the tires are wider.

Search on "tire shudder" "Ackerman" low-speed tire chatter" and so forth. Use Google to search the forum, not the internal search function.

checkur6

Have a 2014 Z-51. Happens every morning when I back out of the garage and cut hard on the front wheels. It's 40 degrees out now (cold for me). Seems like it's always in the front, too. Completely normal.

bearphoto

Only the front tires will do this and it usually happens when its cold. The wider the tires are the more probability it will happen. You can eliminate the issue simply by not turning so hard or so sharp. I'm in Arizona so I don't experience the problem but I picked up the car in Missouri a few weeks ago and drove it home. Stopping for the night in Tucumcari at the Blue Swallow Motel it was 22 degrees in the morning and this issue happened while turning out on to the main road. Its not a big deal or problem, just surprising when it happens.

beachcomber

It's in the manual, normal.

CGGS

Oddly, the C5 Z06 does not suffer from this and it has 265's up front. ???

JerryU

Z51 tires do make it worse. Same size tires as my C6 z51 but much worse chatter. The key is the tires since folks who switch to all season tires say it is eliminated!
If your passenger is your friend they may just tell all your buddy's about the "piece of junk you bought." It's that bad when the tires are cold. That is the way my Z51 feels when backing out in the morning! I now use about 1/2 turn less and make a K turn when backing out of my garage. This will be my 2nd winter and the "chatter" as Chevy calls it, is so bad I don't let it occur, I just don't turn as tight until the tires warm up! Last winter I investigated the causes including Ackerman steering angles, tire slip angle and found the C7 has a tighter steering radius than the C6.
Produced a PDF with many pics of what Ackerman is all about and slip angle info for racing and street tires. The Z51 essentially has racing tires. You can download at http://netwelding.com/wheel_chatter.pdf