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Cold starts and wheels jumping

 
Old 02-02-2019, 12:07 AM
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Cold starts and wheels jumping

whenever I do a cold start and let it warm up and go to turn the wheels for the first time it jumps so bad and sounds horrible turning. ( while driving forward not stationary turning)
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Old 02-02-2019, 01:20 AM
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If you are running wider than stock tires in the front and when it's colder it could be the "Ackermann Effect." It's basically Tire Chatter/Hop. Common in the C7 Vette, AMG GTR and others.


Ackermann Effect
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Old 02-02-2019, 01:36 AM
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Originally Posted by benzbell View Post
If you are running wider than stock tires in the front and when it's colder it could be the "Ackermann Effect." It's basically Tire Chatter/Hop. Common in the C7 Vette, AMG GTR and others.


Ackermann Effect
thank for the info! Itís stock.. it has the summer performance tires. Maybe thatís a factor? Itís stock tire from mb
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Old 02-02-2019, 07:19 AM
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Originally Posted by slowc View Post

thank for the info! It’s stock.. it has the summer performance tires. Maybe that’s a factor? It’s stock tire from mb
A car can still be prone/prevalent with stock tires as well. My GTR comes to mind. Actually, that is where I learned about this - on the GTR forum. Since I haven't heard of anyone mentioning this before on a C63 or another vehicle for that matter. Is why I brought up wider than stock. Doesn't mean you can't be experiencing it slightly with stock tires.

Last edited by benzbell; 02-02-2019 at 07:21 AM. Reason: text
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Old 02-02-2019, 03:09 PM
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Originally Posted by benzbell View Post
A car can still be prone/prevalent with stock tires as well. My GTR comes to mind. Actually, that is where I learned about this - on the GTR forum. Since I haven't heard of anyone mentioning this before on a C63 or another vehicle for that matter. Is why I brought up wider than stock. Doesn't mean you can't be experiencing it slightly with stock tires.
I had this happen on my 911 Turbo before and was always wondering why. Always figured my wider tires were rubbing on the fender liner with full lock.

Thanks for sharing!
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Old 02-02-2019, 05:20 PM
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Isn't that only a thing that occurs on AWD vehicles?
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Old 02-02-2019, 07:13 PM
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Originally Posted by ShakyTom View Post
Isn't that only a thing that occurs on AWD vehicles?
Nope - happens a lot in Porsches and the Z06 as well.
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Old 02-02-2019, 07:34 PM
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Hi, I have the same issue when the wheels would jump when turning during cold weather! I thought this is to do the with fact that the car has a limited slip diff?
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Old 02-02-2019, 08:21 PM
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Originally Posted by ems23 View Post
Hi, I have the same issue when the wheels would jump when turning during cold weather! I thought this is to do the with fact that the car has a limited slip diff?
Diff is in the rear - hop is in the front.
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Old 02-03-2019, 02:14 AM
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Originally Posted by benzbell View Post
Diff is in the rear - hop is in the front.

I have no ideas about this, my rationale was the LSD opposes the turn in (becaus wheel 4&2 are locked) creating a YAW opposite direction to the turn in, this would cause the wheel with least traction to skip, in this case it could be wheel number 3 and you get your hop in the front caused by the diff in the back?

i have no idea about the setup of the suspension of the car just a guess... as I donít see how Ackerman geometry causes it? Just interested in how it works?
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Old 02-05-2019, 11:33 AM
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I had this is my s5, and have it in my c63s now too, when very cold outside. Audi said it was hop, and itís the same on the Merc with a sharp turn in the driveway or parking lot in the morning
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Old 02-05-2019, 01:25 PM
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I feel this all the time when making full lock turns, mostly when parking.

I always assumed it was due to the pronounced camber in the front wheels when at full lock (the edge of the tire rolling over, then not, then rolling over, then not).

I also assumed it was the main culprit for those of us that have issues with the inside edge of the front tires wearing prematurely.
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Old 02-05-2019, 01:44 PM
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I only have it when <~45F
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