$projecthp
  • Grand Sport Gen 2 tire chatter
  • Grand Sport Gen 2 tire chatter
  • Grand Sport Gen 2 tire chatter
  • Grand Sport Gen 2 tire chatter

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  1. #16
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    Exclamation Tire chatter

    I have a huge problem with tire "chatter". I took my 2012 GS back to the dealer to have them drive it when the air temp and the tires (Michelin) are cold. They said the same thing as the responses here in the forum. They even attached a bulliten from GM stating the same thing. Besides the "chattering" my tires don't stick anywhere near as well in cold temps. All performance tires stop sticking at below about 40 degrees. Want to spin out in a hurry? Just push your car too hard in cold temps. My BMW has snow tires on it and my Vette's in the garage waiting for spring.

  2. #17
    Member lqueral's Avatar
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    Default cold sucks

    Quote Originally Posted by Tom Martin View Post
    I have a huge problem with tire "chatter". I took my 2012 GS back to the dealer to have them drive it when the air temp and the tires (Michelin) are cold. They said the same thing as the responses here in the forum. They even attached a bulliten from GM stating the same thing. Besides the "chattering" my tires don't stick anywhere near as well in cold temps. All performance tires stop sticking at below about 40 degrees. .
    I find at less than 60 degrees I can't floor the gas pedal in 1st or 2nd gear and not make the back end hop around. I don't know why the traction/control aids are not preventing the wheelspin, and both nannies are "on". I don't trust the car in less than 60 degrees. At, say, 75 or 80 degrees, doing the same things brings a little tire spin and then hookup and fierce acceleration. I don't drive the car between Thanksgiving and end of March, but April and October have some beautiful 55 or 60 degree days and I have to use extreme caution. My 1996 LT4 was not nearly so slippery either with the OEM Goodyear GS-C's or the Firestones I put on towards the end of my ownership. Both of those tires were considered Ultra Performance Summer, but that car had over 100HP less. I cannot even comprehend how Z06's and ZR1's fare in cooler weather. They must be rolling coffins.

  3. #18
    Technical Advisor c4c5specialist's Avatar
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    HI there,

    This TSB may be of interest to all here.

    This is now a better reasoning, including diagrams to illustrate what Hib and others have explained.

    This was released recently to address C7 and back builds to GS and ZO6/ZR1

    Allthebest, Paul

    #14-03-10-001: Tire Hop / Tire Chatter During Tight Turns at Parking Lot Speeds
    GM World Class Certified Technician.
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  4. #19
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    Danged glad I read this thread. I was a day or two away from taking my car to the dealership to find out what is going on. It felt much like trying to turn hard in a 4X4 with the wheels locked in. Thanks to all for clearing this mysterious issue up.
    Current Vette: 2010 Grand Sport...this is my 5th Vette. I have had a1982, 1984, 2002, 2006 and now this 2010. Awesome cars.

  5. #20
    Technical Writer for Internet & Print Media
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    Default

    Quote Originally Posted by lqueral View Post
    I find at less than 60 degrees I can't floor the gas pedal in 1st or 2nd gear and not make the back end hop around. I don't know why the traction/control aids are not preventing the wheelspin, and both nannies are "on". I don't trust the car in less than 60 degrees. At, say, 75 or 80 degrees, doing the same things brings a little tire spin and then hookup and fierce acceleration. I don't drive the car between Thanksgiving and end of March, but April and October have some beautiful 55 or 60 degree days and I have to use extreme caution. My 1996 LT4 was not nearly so slippery either with the OEM Goodyear GS-C's or the Firestones I put on towards the end of my ownership. Both of those tires were considered Ultra Performance Summer, but that car had over 100HP less. I cannot even comprehend how Z06's and ZR1's fare in cooler weather. They must be rolling coffins.
    If want better traction in weather below 60, you need to either find some all-season tires or, better yet, winter tires, in the C6 GS sizes.

    As far as "flooring" the gas in 1st or 2nd, it's all in tire temperature.

    Learn how to do a drag race burnout before you floor it in 1st and I guarantee the car will hook.

  6. #21
    Member lqueral's Avatar
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    Default tires

    That's what the Chevrolet engineer told me as well. "Heat 'em up, it won't break". Yeah, he actually said that. My concern is that massive wheel-hop can break stuff, and the wheel-hop IS massive. I was told by a Michelin rep that they will soon be releasing their all-season ultra-performance Pilot Sport AS/3 tire in a ZP (runflat) config for the Grand Sport application. I will consider this tire when the OEM's wear out, as I do not track the car, and am willing to sacrifice a tenth or two to get a friendlier tire.

  7. #22
    Member lqueral's Avatar
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    Default Update

    Quote Originally Posted by lqueral View Post
    That's what the Chevrolet engineer told me as well. "Heat 'em up, it won't break". Yeah, he actually said that. My concern is that massive wheel-hop can break stuff, and the wheel-hop IS massive. I was told by a Michelin rep that they will soon be releasing their all-season ultra-performance Pilot Sport AS/3 tire in a ZP (runflat) config for the Grand Sport application. I will consider this tire when the OEM's wear out, as I do not track the car, and am willing to sacrifice a tenth or two to get a friendlier tire.
    Update - I called Michelin yesterday (3/2/15) to find out the status of the AS/3 tire release and the guy I spoke with denied they were coming out with a Grand Sport fitment. Which either means he doesn't know or the previous guy was blowin' smoke up my dupa. The guy I spoke with yesterday didn't seem real sharp, but I think he was right, sadly. I guess not enough demand to justify production in GS sizing. This means the Michelin Pilot Sport PS2 ZP is the only Michelin in GS sizes that are ZP (run-flat). These are summer tires, just like the OEM Goodyears. Oh well.

  8. #23
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    Quote Originally Posted by lqueral View Post
    Update - I called Michelin yesterday (3/2/15) to find out the status of the AS/3 tire release and the guy I spoke with denied they were coming out with a Grand Sport fitment. Which either means he doesn't know or the previous guy was blowin' smoke up my dupa. The guy I spoke with yesterday didn't seem real sharp, but I think he was right, sadly. I guess not enough demand to justify production in GS sizing. This means the Michelin Pilot Sport PS2 ZP is the only Michelin in GS sizes that are ZP (run-flat). These are summer tires, just like the OEM Goodyears. Oh well.
    While "all weather" tires for a performance car like the GS and Z06 is a bit of an oxymoron, I had really good all weather performance on both my Z and GS with Bridgestone Pole Position Potenzas. They are great in the wet and slush, and waaaaay better than OEMs in Winter driving. Just a really great all-around choice.
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  9. #24
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    Default tires or ice skates?

    Quote Originally Posted by catbert View Post
    While "all weather" tires for a performance car like the GS and Z06 is a bit of an oxymoron, I had really good all weather performance on both my Z and GS with Bridgestone Pole Position Potenzas. They are great in the wet and slush, and waaaaay better than OEMs in Winter driving. Just a really great all-around choice.
    I went on Tire Rack, read several reviews on the Bridgestones, and liked what I read. Also saw that the tire had a slightly higher wear index than the OEM's. At a substantial savings over what I consider the junk OEM's, I will seriously consider them as replacements. I generally am a Michelin fan, so I will likely also consider the Pilots at the higher price point. But the Bridgestones interest me.... Thanks for the tip.

  10. #25
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    Default

    Not exactly correct. It is called the Ackermann Effect. A man named Georg Lankensperger, a wooden wheel maker, figured out how to beat it in the early 1800s.

    Lankensperger figured out how to make a pair of wheels turn smoothly in two separate arcs. You see, when you turn the steering wheel of your car all the way to the right, for example, the left or outer wheel travels in a larger circle than the right or inner wheel.

    Lankensperger figured out that if the inside wheel is turned at a greater angle than the outside wheel, it won't skip over the pavement and make that thumping noise that's prevalent in the 2014 Corvette.

    Corvette engineers decided the Stingray's tight turning radius is more important than eliminating the Ackermann Effect, said Chevrolet spokesman Monte Doran. It comes into play only at parking-lot speeds.
    Vette's thumping rubs some drivers the wrong way

    Tire size and rubber compound has nothing to do with it as it is a trick with angles. If the designer didn't want it; he would have followed Lankensperger's "trick."

    It is something the designers of the Corvette chose to ignore.
    Whoosh, and blur

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