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What specifically changed on the C7 to make the tires chatter in parking lots?
None of my C5s or any C6 I've driven does this. I know it's normal, but what changed? The C5/C6/C7 is the same basic car from a frame and suspension layout. Is it the Michelins? Or did something in the front suspension geometry change?
None of my C5s or any C6 I've driven does this. I know it's normal, but what changed? The C5/C6/C7 is the same basic car from a frame and suspension layout. Is it the Michelins? Or did something in the front suspension geometry change?
It's 100% the tires. The all season Michelins won't do this.
It's 100% the tires. The all season Michelins won't do this.
Agreed, along with cold tires.
Cold temps make the PSS summer compound hard. PSS tires don't do that when warm because the compound is then soft and grippy, but in cold temps it's nearly impossible to get enough heat in them.
The AS3+ rubber compound remains more pliable in cold temps, they don't exhibit that behavior, and that's also why they have much more grip in cooler temps.
Can confirm, my original PSS came off earlier this year and going through my first winter with AS3+ tires on mine. Zero chatter/warble/wonkiness in cold weather.
Just a little conjecture here, but a short wheelbase, coupled with smaller circumference front wheels, doesn't help in avoiding wheel hop.
This may or may not be applicable to the C7:
The Smartcar (short wheelbase & smaller front wheels than rear) is notorious for this when being towed four wheels down when being pulled by a motor home. In fact, when towing a Smartcar, you need to use a bungee cord on the steering wheel so the front wheels won't lock up to one side when making turns in the motor home.
Last edited by Skid Row Joe; 12-11-2017 at 12:57 PM.
Ackerman effect, not really. Ackerman effect is when you add Caster; what will do is change the pivot point angle (of the front tire) therefor adding more Camber as you add steering angel (turning the steering wheel).
The true cause of skipping front tires is sticky rubber on a grippe surface with some steering (geometry) thrown in. When turning, the inside edge of the front tire(s) are trying there best to cover a smaller radius than the outside edge of the same tire. So now you have the outer part of the tire trying to cover more ground (distance) than the inner.....something has to give....one part of the tire "Skips" to catch up or equal the speed of the apposing side.
This Skipping action was very common with the C6 cars and F1 Gen II rubber. My C5 would do it too with my track tires mounted....don't worry about it, just enjoy the car.
Thanks all... not worried just wondering why. Had 4 C5s one being a road race car I built on Hoosiers all the time. Even in the paddock it never did what the C7 does.
St. Jude Donor '05-'06-'07-'08-'09, '14-'15-'16-'17-'18
I switched over from the oem summer tires to a new set of Michelin All-Seasons 3 weeks ago and can testify to this. Absolutely no tire noise when turning sharply at low temps.
My 2017 Stingray does the "tire chatter" thing when I first pull out of my driveway and have to make a hard left turn. It is especially bad on cooler days - but I notice that it goes away once the car has been driven a few miles.
When I leave the garage again when the tires are "warm" and have gone a few miles, it is not noticeable.
In the grand scheme of things, it is one of the minor annoyances of driving such a cool car.
Actually it is the Ackerman effect but more correctly a lack of Ackerman correction built in the front suspension geometry to allow for better handling. The ZPs exacerbate the effect not because they are sticky so much as because of their very stiff inner sidewall. But this is the internet so you can believe whatever you want.
Actually it is the Ackerman effect but more correctly a lack of Ackerman correction built in the front suspension geometry to allow for better handling. The ZPs exacerbate the effect not because they are sticky so much as because of their very stiff inner sidewall. But this is the internet so you can believe whatever you want.
None of my C5s or any C6 I've driven does this. I know it's normal, but what changed? The C5/C6/C7 is the same basic car from a frame and suspension layout. Is it the Michelins? Or did something in the front suspension geometry change?
12-11-2017, 10:39 AM
What specifically changed on the C7 to make the tires chatter in parking lots?
