SL55 AMG, SL63 AMG, SL65 AMG (R230) 2002 - 2011 (2003 US for SL55 and 2004 for the SL65)

SL55/63/65/R230 AMG: Struts for AMG Mode

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Old Jan 25, 2020 | 09:18 PM
  #1  
eatmycrackers's Avatar
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2005 SL65 AMG, Motorcycle
Struts for AMG Mode

Hi all I have a 2005 SL65 AMG.

I have a front right strut that has gone bad with leaks. I wanted to know if r230 struts for sl500/sl600 struts also work on the AMG R230? Or if not how is it possible to rebuild/DIY struts? I saw there are replacement boots, ball joints etc.

helhans.de says the struts are interchangeable across R230 AMG/non-AMG, just looking for a second opinion. Thanks
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Old Jan 25, 2020 | 10:47 PM
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Should work fine.
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Old Jan 26, 2020 | 06:01 AM
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'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
Originally Posted by eatmycrackers
I wanted to know if r230 struts for sl500/sl600 struts also work on the AMG R230?
They will install perfectly and work, but there is a difference: The AMG struts are a little bit firmer. I know because I have an SL55 parked next to an SL500 in my garage.
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Old Jan 26, 2020 | 10:54 AM
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Originally Posted by bobterry99
They will install perfectly and work, but there is a difference: The AMG struts are a little bit firmer. I know because I have an SL55 parked next to an SL500 in my garage.
thank you bobterry, that bring another important question, if I were to replace the right front with a standard SL strut is it necessary to replace the left front with a standard strut as well?

Maybe the differences are are very minor but I don’t want to introduce unforeseen suspension/handling issues by going this route.
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Old Jan 26, 2020 | 11:12 AM
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I've read they are the exact same but the suspension algorithm for the AMG will give you a more firm ride. You will be fine.
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Old Jan 26, 2020 | 01:21 PM
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Originally Posted by BlownV8
I've read they are the exact same but the suspension algorithm for the AMG will give you a more firm ride. You will be fine.
Great thank you all for the feedback. Once installed and driven for a few hundred miles I will come back to update this thread for others.
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Old Jan 26, 2020 | 04:14 PM
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'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
The springs are different between the two versions of struts. The shocks may be different as well.

In the video I am bouncing the suspension of an SL500. I can not make my SL55 bounce as easily or as much.


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Old Jan 26, 2020 | 07:15 PM
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There are lots of variables that can affect the bounce test. Give Arnott a call. They can explain the differences since they rebuild and are very familiar. The AMG and non-AMG parts are different so there may be a difference. Arnott Doug is on this forum so reach out to him.
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Old Jan 27, 2020 | 02:32 PM
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
I can't think of anything that can materially affect the bounce test other than the shocks and springs. Am I missing something? Possibly bushings, but that SL in the video has just 50K miles, while my '55 has 105K and would be comparatively looser.

I'm interested in what Doug has to say about the difference between the AMG and regular struts.
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Old Jan 27, 2020 | 03:13 PM
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Could be many things though like suspension settings, ride height, etc, etc. Could be internal springs that are softer but could be the internal valving of the hydraulics. Lots to learn about on these even having been an owner for so long. I've never personally dissected one of the struts. You could be right that the internal springs are stiffer and the rebound is also set differently.

Last edited by BlownV8; Jan 27, 2020 at 08:15 PM.
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Old Jan 28, 2020 | 09:44 PM
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
With the engine shut off the all four locking valves are closed and hydraulically isolate each of the four struts. So in this case a bounce test with an ABC car is no different from a test with a conventional suspension.

Still hope to hear from Doug. I suppose he can quantify how much stiffer the AMG strut is.
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Old Jan 29, 2020 | 10:36 AM
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Are both vehicles the same height from the ground to the fender? If the 55 is lower, that can have an effect and will have less bounce than the vehicle that is higher.
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Old Jan 29, 2020 | 03:34 PM
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'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
The bounce test is affected by the spring and shock characteristics. I don't see how the length of the strut would change those. At any rate, to my slight annoyance the '55 is a little bit higher.
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Old Jan 29, 2020 | 04:13 PM
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Interesting, must be internal valving and probably a combination of stiffer spring.
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