tigerlee

I just got the new stingray year 2019, A8 and has on 400 mile one it. I do have little problem .
Every time I turn to the left or the right and even make u turn with slow speed then the steering would make some kind of ticking like a knocking noise, it is last about 1-5 second but specially happen when engine is cold or in the morning and at night
Pls give me some advice and I am very new member at this forum
Thank you very much

thrilled

DALE#3

They do it more when tires are cold.Nothing to do with engine at all it's your geometry of your front suspension.I simply don't cut the wheels sharp.Just have to back up more times.Really i don't like it so i avoid it.
This guy can explain it in more detail.Technically called:The Ackerman Effect

JerryU

Encountered that issue with my early C7, Z51 in October 2013. Little info from GM at the time other than the "Chatter is normal" in the Owner's Manual. It was so much worse than I every encountered with my C6 Z51 in 6 years with the same width tires as my C7 I knew it was much more than Ackerman steering compensation. Did the research and found manufacturers do not use full Ackerman front tires steering radius compensation in turns as the tire slip angle compensates for some of the difference on slow speed sharp turns. But race car tire construction has very low slip angels to provide fast response and maximum lateral "g" force in high speed turns. Turns out the Michelin tires have more race car type tire construction.

Proof it's not just sticky tires, wide tires or Ackerman steering geometry? The OEM tires get less sticky when they get cold and the issue goes away with the same width, more normal slip angle all-season tires that also do not get as "hard" when cold. However at high speeds the loads on the inside and outside tire in a turn are different and "full Ackerman" compensation is not needed and if used reduces the max achievable lateral "g" force. Yep you bought a performance car in warm weather!

This is a Pic/text PDF of what I found: http://netwelding.com/Wheel_Chatter.pdf

Understanding why it is happening make you feel better and I suggest using what I (and many others) do to avoid the issue when temps are below 45/50 F in slow speed turns. I tune the wheel less and make a "K" turn. After I back out of my driveway in the morning, I turn full lock turn in warm weather to go down the driveway. Very tittle "Chatter." When below ~45F I turn the wheel less and make a "K" turn to go down the driveway or the "Chatter" is so bad I don't like the "Hopping" as GM also calls it! The PDF also discusses why it's worse in rain as GM states and I have validated.

bearphoto

Yes it happens when its cold out and tires are cold and you are turning the wheels sharply. Every car with ultra wide tires has this issue. It scares you the first time you experience it but once you know when it will happen you compensate for it when you can by not turning so sharply. Enjoy your new corvette!

papillion

First time this happened, January 2014 the car had 15 miles. Backing out of the drive way early morning run to Starbuck's. Scared the ba jee zus out of me. Which is why google is my BFF. Saved me a heart attack almost day one with our new car.

Don Wallace

MY 18 did also, found that owners manual said it was normal, if I remember right it was on page 281 in my manual.

KenHorse

Seems we need a sticky, with the title in size 56 font, bold, italicized and underlined, flashing red

Vet Interested

JMII

Woodson

They do hang a little note from the shifter.

mountainears

Just to clarify. There are two different noises that are common when turning on these cars. One is discussed already in this thread, the ackerman effect, which I would describe a bit more like a tire hopping or skipping I guess. Sounds a bit like what the OP is talking about, except I saw the word ticking, but I still think it is what they are referring to.

The other noise that happens is more with GS and Z06 vehicles, on full lock turns at slow speeds as well, this I would describe as a ticking noise, almost like if you had cards in your spokes on bicycle. A very metallic sounding tick that happens. For this there is a TSB that involves pulling the wheels and cleaning the inside mounting surfaces then re-torquing the wheels to spec. It likely will not permanently fix the issue, but definitely resolves it for a long while.

JerryU

"Ticking noise" is hard to diagnose, especially in writing on the forum! My Grand Sport had that noise like when you put a card in a bicycle spoke. BUT mine was clearly only on full lock right turns and only one click per revolution. Tried that TSB several times. Cleaned the surfaces very good. Same Tick. Thought it was the plastic air duct hitting but could not identify what was hitting and jacking up the wheel (which I did many times) and rotating did not cause the sound. The tick became less and less.

But after a year and when changing oil I found the culprit. There is a wheel weight on the very inside of the left wheel that was hitting the plastic brake cooling air deflector and had worn away a bevel on the top edge of the weight (and no doubt some of the offending plastic! ) There is no noise now! Things ae very close in the GS/Z06 front wheel well!

JMII

WOW the ducts are a really tight fit if the tiny brake weight was enough to contact them. Good catch!

JerryU

^^^
Yep with the front GS/Z06 tires = to the Z51 rear there is very little space. They almost rub the inner fender well on a full lock turn. The brake cooling duct and the air deflector are also close.

I only caught it after the slight wear occurred! When you jack the wheel clearances are totally different. Was going to put a jack under the lower ball joint with the wheel off the ground but no room with the wheel on!

Maxpowers

CF - setting an internet world record at explaining Ackerman Effect in detail!

TyBoo

There is actually more whining about having to explain it than there is actual explaining. It would seem so much less bothersome to not say anything at all if the having to say it is such a bother. Sheesh. Give the guy a break.

Maxpowers

Not sure if your comment was directed at me or not. My only point is the OP had a Q, and Dale / Jerry and folks were fast at providing responses / context even though this Q comes up weekly at this time of year. Its what makes this community great.

JerryU

^^^
Thanks and I understated that some prefer just a simple explanation of 'It's Ackerman' and move on.

Others wonder why it doesn't occur with the exact same Ackerman steering geometry with the same wide width all-season or winter tires! Those folks can look into what I discovered- it's the race car low slip angles on the OEM Michelin tires that essentially get even lower when cold!!

TyBoo