Rear end swaying left and right under heavy acceleration - Mercedes-Benz Forum
 
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post #1 of 8 (permalink) Old 12-27-2017, 08:49 AM Thread Starter
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Rear end swaying left and right under heavy acceleration

Rear end swaying left and right under heavy acceleration.....

friend thinks its a sensor that cant determine ride height? is this common or ...?

thanks in advance
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post #2 of 8 (permalink) Old 12-27-2017, 06:14 PM
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Mine did that when the tires were worn. New tires fixed it.

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post #3 of 8 (permalink) Old 12-28-2017, 05:29 AM
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I had the same problem with my SL55 and thought it was bushings or alignment or something. Definitely not normal feel. I’ve checked all those and nothing out the ordinary was found.

More I drove it, it appeared to be the traction control and accelerometers reacting to losing traction on one rear tire.
Control system then tapped the brake on that slipping tire, which causes the opposite tire to slip, repeating the process and getting pretty wild. This was on Mich PSS tires with stock suspension.

I hesitate to turn off the traction control, as things could get sideways fast, but that is an option to test. Don’t do this unless skilled.

My tires are now new (Conti Sport Contact 5P), which helps, and I also added rear camber links to reduce negative camber (now -1degree), which also helps, but the feel of happy tail wagging still comes and goes when I accelerate hard. Not as bad, but you can feel it still.

Not sure I solved it, but better grip seems to cure the issue. Try raising the car to highest setting, which flattens the camber, or lowering tire pressure for better bite. Let us know what happens.

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'03 SL55 AMG Pano 95K Mi.
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post #4 of 8 (permalink) Old 12-28-2017, 02:49 PM Thread Starter
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Thanks ill try the no traction control thing...

also, my tires are brand new michelin super sports and they dont slip at all
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post #5 of 8 (permalink) Old 12-29-2017, 01:42 AM
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On my R129 the multi links in the rear suspension gave this ‘wagging the tail ‘ feeling. There was play in the bushings. You can easily check by removing wheel and use a pry bar on the link ends and check for abnormal play. A good suspension shop will be able to help as well.

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post #6 of 8 (permalink) Old 01-02-2018, 04:50 AM
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Thanks ill try the no traction control thing...

also, my tires are brand new michelin super sports and they dont slip at all
Dammit. I thought the tires were spinning on mine but it's doing the same damn thing after installing lowering links and new wheels and Michelin PSS. It feels like I'm completely losing traction in the rear and the tail wags.
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post #7 of 8 (permalink) Old 01-02-2018, 06:16 AM
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Dammit. I thought the tires were spinning on mine but it's doing the same damn thing after installing lowering links and new wheels and Michelin PSS. It feels like I'm completely losing traction in the rear and the tail wags.
Note the lower the car goes, the more negative camber it has, and the smaller contact patch it may have.
I’d like to know other solutions if someone find the cause. I have this issue still too.

'11 E350 Bluetec P2 Sport 55K Mi.
'03 SL55 AMG Pano 95K Mi.
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post #8 of 8 (permalink) Old 01-02-2018, 06:18 AM
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Note the lower the car goes, the more negative camber it has, and the smaller contact patch it may have.
I’d like to know other solutions if someone find the cause. I have this issue still too.
It's set on the default setting on the lowering links, 1 inch.
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