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Rear End Kicking Out

 
Old 12-13-2016, 09:11 PM
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Rear End Kicking Out

i've been a long time lurker but finally made an acct. I have a 14 C63. Car was just aligned by Mercedes. When i drive hard and shift from 2nd to 3rd my rear end kicks out. Would this be an alignment problem or something else?
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Old 12-13-2016, 09:17 PM
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It's power breaking traction. But when was the last time you had an alignment? Could be time. But when my car breaks loose it rarely ever stays completely straight due to differences in grip, camber of the road, and a few other factors.
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Old 12-13-2016, 09:21 PM
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It's never done that before that's why. And i just got the car aligned from Mercedes. The only thing different is maybe the V6 tune. I'm going to rotate the tires this weekend to see if that helps.

Last edited by c63prob; 11-28-2017 at 11:31 PM.
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Old 12-13-2016, 09:23 PM
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If you are a base C63, the v6 tune adds a significant amount of power. Additionally, it's colder. That means more power and less grip. If you just got an alignment, it's probably fine. Have fun!
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Old 12-13-2016, 09:55 PM
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Originally Posted by c63prob View Post
...k. I'm going to rotate the tires this weekend to see if that helps.
how are you going to rotate tires. The front and rear wheels are different sizes?
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Old 12-14-2016, 12:19 AM
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Just the rears, just to make sure it's my my tire wear that's the problem
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Old 12-14-2016, 06:56 AM
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Originally Posted by QWKSNKE View Post
how are you going to rotate tires. The front and rear wheels are different sizes?
Yes, you cannot rotate the tires, if dealer just did an alignment, I assume they would have noticed and told you if the tires were done, I would check the tread wear, but doubt it is that bad if they did not notice it.

I am going to take a shot at something. Where do you live and what is the temperature? These cars come with Summer only tires by default, it is possible someone put on all seasons, but if you live where the temperature is now below 45 F and still driving on summer tires, they get hard as a rock in the cold and and have no traction and basically you will wrap the car around a post if you are still on summers in the winter where it is cold out - any chance that is the issue? Where do you live and what tires do you have?
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Old 12-14-2016, 10:36 AM
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Exclamation

You do NOT want to swap tires left to right on a high hp car even if they are not directional (and unless you're runnign a square set of winters, you can't swap them front to rear either because of the size difference). The steel and nylon belts in the tire carcass will "set" over time depending on the direction in which they're being twisted, and they may separate if you then start twisting the tire in the opposite direction - resulting in a blowout. I've seen it happen, so I'd strongly caution against it. If you have a Prius or a Corolla, then maybe, but not on a C63 or anything that can actually produce enough torque to spin them on dry ground. Once you've put several hundred miles on them "in anger", they always need to stay on the same side of the car (i.e. rotate in the same direction).
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Old 12-14-2016, 10:50 AM
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^^^did not know that. Good to know. Thanks.
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Old 12-14-2016, 12:51 PM
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Originally Posted by Diabolis View Post
You do NOT want to swap tires left to right on a high hp car even if they are not directional (and unless you're runnign a square set of winters, you can't swap them front to rear either because of the size difference). The steel and nylon belts in the tire carcass will "set" over time depending on the direction in which they're being twisted, and they may separate if you then start twisting the tire in the opposite direction - resulting in a blowout. I've seen it happen, so I'd strongly caution against it. If you have a Prius or a Corolla, then maybe, but not on a C63 or anything that can actually produce enough torque to spin them on dry ground. Once you've put several hundred miles on them "in anger", they always need to stay on the same side of the car (i.e. rotate in the same direction).
Is this not a problem if you dismount the tires from the wheels and THEN do a swap, so that they continue to rotate in the same direction? This has an added benefit if your tires show inner-edge wear from excessive toe or camber, because what was once inside edge becomes outside edge.
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Old 12-14-2016, 01:19 PM
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Originally Posted by zcct04 View Post
Is this not a problem if you dismount the tires from the wheels and THEN do a swap, so that they continue to rotate in the same direction? This has an added benefit if your tires show inner-edge wear from excessive toe or camber, because what was once inside edge becomes outside edge.
If you are talking about taking a tire with a symmetrical tread pattern (one that does not have an "inside" and an "outside" - like a Toyo T1-R IIRC), dismounting it from the rim and putting it on the other side so that the old inside is now the outside, then yes, that is fine because the tire will continue to rotate in the same direction so you could get some more life out of them. Obviously not an option if the tires are asymmetrical (like the PSS).
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Old 12-14-2016, 02:35 PM
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The temps and tune cause this. It kicks out slightly sideways because of the open diff. Check your alignment sheet to see if the camber and toe have changed.
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Old 12-14-2016, 03:02 PM
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Originally Posted by Diabolis View Post
You do NOT want to swap tires left to right on a high hp car even if they are not directional (and unless you're runnign a square set of winters, you can't swap them front to rear either because of the size difference). The steel and nylon belts in the tire carcass will "set" over time depending on the direction in which they're being twisted, and they may separate if you then start twisting the tire in the opposite direction - resulting in a blowout. I've seen it happen, so I'd strongly caution against it. If you have a Prius or a Corolla, then maybe, but not on a C63 or anything that can actually produce enough torque to spin them on dry ground. Once you've put several hundred miles on them "in anger", they always need to stay on the same side of the car (i.e. rotate in the same direction).
+1 on this...


Originally Posted by Diabolis View Post
If you are talking about taking a tire with a symmetrical tread pattern (one that does not have an "inside" and an "outside" - like a Toyo T1-R IIRC), dismounting it from the rim and putting it on the other side so that the old inside is now the outside, then yes, that is fine because the tire will continue to rotate in the same direction so you could get some more life out of them. Obviously not an option if the tires are asymmetrical (like the PSS).
+1000 on this...

OP, like most said, if it doesnt happen often, i wouldnt worry about it too much. quite a few factors to consider including road conditions. youre driving a high powered car. it will fish tail now and again.
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Old 12-14-2016, 07:49 PM
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Originally Posted by c63prob View Post
i've been a long time lurker but finally made an acct. I have a 14 C63. Car was just aligned by Mercedes. When i drive hard and shift from 2nd to 3rd my rear end kicks out. Would this be an alignment problem or something else?
Do you have the same kick-out on the 1->2 shift?
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Old 12-14-2016, 10:30 PM
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Its called torque. It's a helluva drug.
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Old 12-15-2016, 08:53 AM
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If this happens after the alignment and you are not driving really hard, then it is likely the alignment. It doesnt mean it is bad. A less positive toe gives more turn in. Your previous toe maybe be too positive, / \
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Old 12-15-2016, 11:03 AM
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You dont even have to be driving hard at all if it is just cold where you are. Not wet, not snowing, just cold. As someone said, the tires are like bricks at that point and have no gripping qualities.

OP -- If it is cold by you I would hold off on making changes to the car because it may be acting perfectly normal. However, if it does get cold by you (I would say under 40 degrees for extended periods of time) I would consider a more appropriate tire.
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Old 12-15-2016, 11:17 AM
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Just sounds to me like you're finally driving the car properly ¯\_(ツ)_/¯
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Old 12-15-2016, 02:15 PM
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One of the things I noticed when I got this car -after having 10 previous MB models with ESP going back to the 1986 E300 - and the evolution of ESP into more modern stability control, is the ease with which my right foot can still overcome the system. When I do it the lights flash on the dash and I can feel the system trying but I can beat it with the 481 ponies under the hood and LSD on dry pavement in 75 degree weather in C with its 2nd gear start.
This was a sign I did not want the summer tires on in our colder 32-40 degree winter days and bought proper winter tires and still I can beat the system.
All this talk of alignment? Is it really relevant? It would have to be out huge would it not to affect this? Would it not also be an issue at low throttle inputs as well as at high inputs if it is alignment? If it is huge is the rear movement always in one direction? Usually the rears will want to go right. Is this the case or is it going left?
Thrust angle spec is 0.12 degrees max. from center in either direction My car is -0.02 just off straight, with negative being left of center.
As to the tires I agree. You cannot safely move a stagger forward and back nor can you move directional tires side to side without dismounting and remounting them to retain directionality. I have never run asymetric tires on any car but the logic argued against them by others makes sense.
My suggestion? If you are in a cold climate get winter tires and in winter and summer learn where the limits are because you will defeat the ESP which will destabilize the rear end and more so with and LSD. Keep in mind that in some circumstances a bit of drift can be fun. Physics will rule.
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Old 12-16-2016, 12:42 AM
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Thank you everybody for the reply. Ive never owned such a beast and 1st time seeing colder weather!!
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Old 12-16-2016, 12:49 AM
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Originally Posted by c63prob View Post
Thank you everybody for the reply. Ive never owned such a beast and 1st time seeing colder weather!!
It's an animal most of the time, and it gets that little bit angrier in the cold weather.
Enjoy the power.
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Old 12-17-2016, 04:42 PM
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I don't see how this is a problem.
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Old 12-17-2016, 05:09 PM
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It's the weather, nothing else, I can bet on it.

Cars feel like they've gained a substantial amount more power in cold weather. I remember with my E55, it felt like I upgraded the blower that thing pulled so much harder in the cold once the heatsoak issue with the summer months went away in the winter months. Felt like 80HP leap, not kidding.
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Old 12-18-2016, 11:11 PM
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Originally Posted by c63prob View Post
i've been a long time lurker but finally made an acct. I have a 14 C63. Car was just aligned by Mercedes. When i drive hard and shift from 2nd to 3rd my rear end kicks out. Would this be an alignment problem or something else?

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Old 12-19-2016, 12:13 AM
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Originally Posted by c63prob View Post
Thank you everybody for the reply. Ive never owned such a beast and 1st time seeing colder weather!!
I grew up in southern Ontario when winter snow was deep and regular. I learned to drift my dads orginal VW bugs at a very early age. I know how to drive in snow.
A few weeks ago we had some snow here on southern Vancouver Island. The locals were referring to it as Snomaggedon. All over and inch or less of snow.
I dropped she who shall be listend to off at a girl friend's apartment and drove around the back to go out the other side of the building.
Now keep in mind I have winter tires, ESP etc. When I turned left behind the building it was pretty much ice. I never touched the throttle and the back end went out and the ESP was useless. I had to dump it out of gear and drag the brakes to stop idle induced wheel spin.
That told me a helluva a lot about just how much of this 481 ponies gets dumped to the rear wheels. I have learned to tip toe pretty fast even in snow with this beasty.
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