malibudoc

When slow turning with a 2014 C7 and steering wheel is turned full right or full left I often feel what appears to be the tires scrubbing sideways on the street. Is this normal because of the tire width or is something defective?

Baer383

It is normal b/c of the 7.0 degrees of caster in the front end alignment.

alienranch

Perfectly normal, albeit annoying

eboggs_jkvl

Shows why the tire snap happens.

Elmer

Rave

I've seen this animation before and it definitely helps to understand what's going on. But perhaps the bigger question is, why did GM designed it this way? I can't remember any other vehicle I've owned that have had this slow steering issue.

tanner m

owc6

Yes, but many, who are new to the the community (and this gen), don't know this.

You may have seen the subject come up many times and are tired of it, but most likely, the OP hasn't.

Frankly, this is one "smilies" or emotcon/imoge that could be done away with, IMO, because it does nothing but promote belittling. No one who posts this adds anything of value to the conversation.

Don't get me wrong, I'm one of the first to quip in with a sarcastic remark, but I' also one of the first to step away when I realize it has gone beyond friendly ribbing.

Virtually, 100% of those who post the poor unfortunate equine, should just not respond, and go to the next thread that might have some relevance to them.

lancekl

malibudoc

Sorry if you were offended by my having beat the ceremonial dead horse. However, after searching through this site looking for a thread that deals with this issue, I found nothing.
MTC

Rave

I've read a lot of posts about this issue, and understand what's going. Typically responders post a graphic, or the name of the condition, and state it's a normal condition. That's all fine but never have read anything about why GM designed the steering this way. Was there some handling trade-off that had to be met? Or perhaps just the characteristics of the geometry of the steering components at extreme steering angles? I'm not bitchin', just curious.

Digfoot

StingerBG

It's called the Ackermann effect. As shown in the illustration above, it's due to differences in steering linkage speeds... it is easily fixed through modern steering technologies however Corvette engineers have chose not to because the car actually handles better at higher speeds the way it is...and they deemed that as more a priority.

Rave

Thanks, answering the question about what the condition is, what it's called, and that's it's normal, is normally what everyone says. But your post is the first time I've read an answer as to why it hasn't been corrected.

MitchAlsup

Yes, it is.

It is easily fixed by using toe-OUT--however this makes the car nervous in the straight line.

The Vette actually goes around corners faster with a bit of toe-OUT, but few drivers would put up with the nervousness. Most race cars use toe-OUT in order to minimize scrub in turns and thereby get rid of a source that heats the front tires. After getting rid of this source of heat, the camber can be adjusted for more grip.

All at the expense of nervousness in a straight line.

malibudoc

Thank you for your response.

StingerBG

You're welcome! I actually had the same concern when I first bought mine and did a big search on it!

C7Kevin

I posted this on another thread, one of many that asks about the symptom.

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Perhaps just another case of: "a little bit of knowledge is a dangerous thing."

But, I can't help but wonder if the "ackermann-caused" tire hop issue on C7 Corvettes is a predictable byproduct of Chevrolet's desire to provide the exceptional turn-in capabilities that many have raved about.

I am happy to be proven wrong about this, but, until then, I think that the "hopping" is just a price we pay to enjoy fabulous turn-in on the C7s.

I believe that the type and amount of Ackermann employed in the C7 steering geometry was employed by Chevrolet to produce the great turn-in that C7s have.

I have a 2015 C7 Z51 coupe and I just LOVE the steering in general, but particularly the fabulous turn-in the car has. It's nothing like any car I have ever driven.