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C8, will it also have the Ackerman effect?

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  • SheepDog
    replied
    Originally posted by Racer86 View Post

    4. The twisting and resultant torque loading across the tread when turning a wide tire at low speed. When the distorted tire patch load gets to critical, the tread unloads this distortion, and that unloading it what you hear. It’s snapping back to shape.
    This explanation, I can visualize.

    If the front tires are free wheeling.

    the bach has a diff
    Last edited by SheepDog; 08-31-2019, 07:31 PM.

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  • Boomer
    replied
    Originally posted by Mobius View Post
    Yes, and you can hear it from Tadge himself, at 25:00 in this video
    Didn't watch it but thats good news. Gonna miss Mr Ackerman. Bet its got lots to do with all season tires. Good job there.

    Leave a comment:


  • Mobius
    replied
    Originally posted by John View Post

    GM announced that there will be no front end shuddering on the C8.
    Yes, and you can hear it from Tadge himself, at 25:00 in this video:

    Leave a comment:


  • John
    replied
    Originally posted by L79 View Post
    I changed over to Michelin all season tires on both my C7s....problem solved. I'm hearing the base C8 will also have all seasons, so hopefully not a problem.
    GM announced that there will be no front end shuddering on the C8.

    Leave a comment:


  • BlueMoon
    replied
    Originally posted by Aviator View Post
    Read an article in one of the car rags (sorry, can't remember which one and left it on an airplane yesterday)
    the steering vector will be variable at slower speeds.
    Thats a huge technological step. Anyone know which magazine?

    Leave a comment:


  • BlueMoon
    replied
    Originally posted by meyerweb View Post

    Google is your friend. There are quite a few articles about it, although I don't know if any go into the detail you're looking for. But it's really pretty simple. The inside tire turns a tighter radius than the outside tire. If both tires are turned an equal amount, one of them is going to scrub.
    Yes, but you are my Guru <wink>
    What I am asking is why NOT using the Ackerman principal helps cornering on the track?

    Leave a comment:


  • L79
    replied
    I changed over to Michelin all season tires on both my C7s....problem solved. I'm hearing the base C8 will also have all seasons, so hopefully not a problem.

    Leave a comment:


  • John
    replied
    Originally posted by centerpunch
    The whole brilliant concept of Ackerman geometry is that it has almost no effect at small steering angles (by definition, high speed turns are at small steering angles), and noticeable effect only at large steering angles (u-turns, maneuvering in parking lots, etc.).

    Corvette track (distance between centers of left and right tires) is about 5 feet. Cornering around a skidpad of 200 feet radius, the inside wheel is traveling around a 200 foot radius, and the outside wheel is traveling around a 205 foot radius. That's only a 2.5% difference, pretty minimal.

    But around a tight 20 foot radius circle, the outside wheel is traveling around a 25 foot circle- a 20% difference.
    Thanks centerpunch. I love learning new info. Welcome to the forum!

    Leave a comment:


  • John
    replied
    Welcome Gearhead2014. Thanks for your first post. You ask a good question. I volunteer to test out the Z51 in cold weather at full lock.

    Leave a comment:


  • Gearhead2014
    replied
    At the reveal, Tadge said the wheel hop is no longer an issue. I'm sure that would be the case for the All Season tire, but it was unclear to me if that was true for both types of tires.
    It never bothered me. In fact I,considered it a reminder of how special the car was!

    Pete

    2014 Premiere vert
    Last edited by Gearhead2014; 08-12-2019, 03:04 PM.

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  • Aviator
    replied
    Read an article in one of the car rags (sorry, can't remember which one and left it on an airplane yesterday) that explained that despite a 1 inch+ longer wheelbase than the C7, the C8 will have a tighter turning radius (36 feet versus the C7 37.7 feet), and that the steering vector will be variable at slower speeds. While the article did not address the Ackerman effect, the mid engine placement will have a definite positive effect on turning radius and low speed steering.

    Leave a comment:


  • meyerweb
    replied
    Originally posted by BlueMoon View Post
    >But what works at parking lot speeds and tight radius doesn't work so well at high speeds and wider radius.

    Would love to hear a full explanation from you of that... (slip angles, CofG, weight xfer)
    Google is your friend. There are quite a few articles about it, although I don't know if any go into the detail you're looking for. But it's really pretty simple. The inside tire turns a tighter radius than the outside tire. If both tires are turned an equal amount, one of them is going to scrub.

    Leave a comment:


  • BlueMoon
    replied
    >But what works at parking lot speeds and tight radius doesn't work so well at high speeds and wider radius.

    Would love to hear a full explanation from you of that... (slip angles, CofG, weight xfer)

    Leave a comment:


  • karim7800
    replied
    Originally posted by khanmark View Post
    Thanks everyone for the discussion responses.

    Overall, it looks like the consensusYou**** Pornhub Tubegalore is that most likely we'll get the hops and noise still, but will have to wait and see for the actual behavior of the car for a definitive answer.

    Ackerman can easily be changed in the current space available. Simple geometry, steering arm length and angle to the tie rods. My opinion of the hopping noise is due to the width and cold temp hardness of the tire.
    Last edited by karim7800; 06-06-2019, 03:31 PM.

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  • khanmark
    replied
    Thanks everyone for the discussion responses.

    Overall, it looks like the consensus is that most likely we'll get the hops and noise still, but will have to wait and see for the actual behavior of the car for a definitive answer.

    Leave a comment:

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