Cold starts and wheels jumping

Feb 1, 2019 | 11:07 PM

slowc

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From: Virginia

2010 c300 4matic , 2005 c230 kompressor (totaled) , 97' honda civic, 2018 c63s coupe

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)

Feb 2, 2019 | 12:20 AM

benzbell

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2023 Urus Performante 2018 Huracan Perf. - 2017 Ferrari 488 GTB

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

Feb 2, 2019 | 12:36 AM

slowc

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From: Virginia

2010 c300 4matic , 2005 c230 kompressor (totaled) , 97' honda civic, 2018 c63s coupe

Quote:

Originally Posted by benzbell

thank for the info! It’s stock.. it has the summer performance tires. Maybe that’s a factor? It’s stock tire from mb

Feb 2, 2019 | 06:19 AM

benzbell

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2023 Urus Performante 2018 Huracan Perf. - 2017 Ferrari 488 GTB

Quote:

Originally Posted by slowc

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; Feb 2, 2019 at 06:21 AM. Reason: text

Feb 2, 2019 | 02:09 PM

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2020 GLE 53 AMG

Quote:

Originally Posted by benzbell

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!

Feb 2, 2019 | 04:20 PM

ShakyTom

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C43 AMG Coupe

Isn't that only a thing that occurs on AWD vehicles?

Feb 2, 2019 | 06:13 PM

benzbell

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2023 Urus Performante 2018 Huracan Perf. - 2017 Ferrari 488 GTB

Quote:

Originally Posted by ShakyTom

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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Feb 2, 2019 | 07:21 PM

benzbell

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2023 Urus Performante 2018 Huracan Perf. - 2017 Ferrari 488 GTB

Quote:

Originally Posted by ems23

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.

Feb 3, 2019 | 01:14 AM

#10

ems23

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W205 2015 4.0

Quote:

Originally Posted by benzbell

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 don’t see how Ackerman geometry causes it? Just interested in how it works?

Feb 5, 2019 | 10:33 AM

#11

Woodr85

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W205 c63s

I had this is my s5, and have it in my c63s now too, when very cold outside. Audi said it was hop, and it’s the same on the Merc with a sharp turn in the driveway or parking lot in the morning

Feb 5, 2019 | 12:25 PM

#12

msd3075

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Joined: Jun 2015

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From: Houston, TX

'15 C63S

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.