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Registered 2012 SLK55 AMG
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Discussion Starter #1
Since the weather is so beautiful in the midwest, just dropped my AMG off at my favorite local shop, to have them install KW DDC coilovers. They look pretty amazing, getting the WiFi connection also. Hope to have some pictures later. Parts aren't in yet, but I'm sure they will be by the time it's actually spring in a month or two from now.

KW automotive GmbH - Gewindefahrwerke, Rennsportfahrwerke, Sportfedern - KW DDC

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Super Moderator CA 2012 SLK55 AMG w/P30
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Just wondering:

First of all, I'm not the most mechanically-minded guy in the tool chest so I've got a question: I was under the impression that the setup in our '55s in regards to C, S and M provided for adjustable suspension (ie more comfort or more "handling") depending on the setting used.

I see from your link that these coil-overs provide the same sort of adjustment (not taking into account the raising or lowering aspect--unless that's the only reason you're getting them).

Could you explain why you find the standard equipment less desireable than the after market setup you are installing?
 

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Premium Member 2005 SLK55 AMG
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Just wondering:

First of all, I'm not the most mechanically-minded guy in the tool chest so I've got a question: I was under the impression that the setup in our '55s in regards to C, S and M provided for adjustable suspension (ie more comfort or more "handling") depending on the setting used.

I see from your link that these coil-overs provide the same sort of adjustment (not taking into account the raising or lowering aspect--unless that's the only reason you're getting them).

Could you explain why you find the standard equipment less desireable than the after market setup you are installing?
I thought that was optional (with the dynamic handling package), so perhaps the OP's car doesn't have that option?
(unless the dynamic handling package is standard on all R172 SLK55 AMGs?) :D
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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I thought that was optional (with the dynamic handling package), so perhaps the OP's car doesn't have that option?
(unless the dynamic handling package is standard on all R172 SLK55 AMGs?) :D
And that may very well be true. I don't know is why I asked. When I look at my data sheet, it doesn't appear that things are indicated as either standard or an option was chosen.

They're just "there".

One way to look at this is: how is a base car equipped? Different models require an option be chosen but may be standard on others.

Just don't know so maybe my original question is phrased incorrectly?

edit-->I see that "sport suspension" is standard whereas "performance suspension" is optional. No idea if that is significant (but may very well be).
 

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Premium Member
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The famous P30 performance package has something for the brakes, suspension and engine.

As it happens, I'm delivering my 55 to a shop that will install the KW3 coilovers (not the DDC, on the occasional track day I can adjust manually). On my previous R171 350 the rear springs broke @ 130K km's. I'm now at 110K, better safe than sorry.

They'll also replace the last end of the brake lines with SS ones and paint the calipers red (more braking power <ahem> ) with AMG logo.

Than, after a month or two, I'll determine if other rims and/or wider tires are in order.
 

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Registered 2012 SLK55 AMG
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68 Posts
Discussion Starter #6
Leon, great question.

My car does have the P30 performance package. I don't believe that package includes any variable change to the suspension, through the CSM button or otherwise.

I love driving the car at high performance levels, and have taken it to my favorite local Road Race Track, and thoroughly enjoy the experience. I especially enjoy the transmission in the sport mode with traction control in sport or off mode. It is surprisingly intuitive, especially with aggressive downshifting well threshold braking, and always amazingly has the correct gear at turn in for the corner.

Actually I find the car incredibly harsh and rough riding for extended periods of time or even short jaunts, with the sport package, and the 19-inch Wheels. Not sure if it's the suspension tuning, the tire fitment, or the combination of everything, but the car is just too harsh for appreciable Comfort level on roads, especially ones that are not so smooth and have the typical payment break seams that are large.

My guess is that for improved body roll and control, the shocks and struts have an excessive amount of rebound dialed into the factory P30 settings. Great handling, very happy with it on track, but neck jarring on my local commute. That's the real reason I'm going to the DDC KW package. Wanting to be able to have the ability to soften the shocks struts excessively, for Comfort, the wife is also, since she's less tolerant than me. With the capability to dial it back to sport+ mode and more importantly yet having the capability to individually dial my own shock strut damping settings, on the fly, Without crawling under the car. I have a race car that I tune with 4-way shocks Springs & swaybars etc Etc, this is just the fun car, don't want to work on it too hard so a push of the button or a transmit from the Android phone and I'm hoping for a much better Comfort ride, without losing any control when I want hiperf handling.

Also the KW recommended ride height settings appear to be about three quarters of an inch lower, which I think will look about right, surprisingly this SLK 55 sits higher than my stock naturally aspirated Pontiac Solstice, which I sold to get this SLK.

Good comment on SS lines judge, I'm adding that to my list, along with a powder coat of the calipers, to what I think is a more appropriate color instead of the yellow they are now. Was yellow the stock 55 color on calipers?

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Premium Member
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My car does have the P30 performance package. I don't believe that package includes any variable change to the suspension, through the CSM button or otherwise.
Nah, it only changes the amount of revs when gears are changed.

I love driving the car at high performance levels, and have taken it to my favorite local Road Race Track, and thoroughly enjoy the experience. I especially enjoy the transmission in the sport mode with traction control in sport or off mode. It is surprisingly intuitive, especially with aggressive downshifting well threshold braking, and always amazingly has the correct gear at turn in for the corner.

Actually I find the car incredibly harsh and rough riding for extended periods of time or even short jaunts, with the sport package, and the 19-inch Wheels. Not sure if it's the suspension tuning, the tire fitment, or the combination of everything, but the car is just too harsh for appreciable Comfort level on roads, especially ones that are not so smooth and have the typical payment break seams that are large.
Yep, less than smooth roads with 19" will do that. Only the Black Edition of the R171 came stock with 19" and just about 120 were made. Those must be the people that do only collect and/or do track.

My guess is that for improved body roll and control, the shocks and struts have an excessive amount of rebound dialed into the factory P30 settings. Great handling, very happy with it on track, but neck jarring on my local commute. That's the real reason I'm going to the DDC KW package. Wanting to be able to have the ability to soften the shocks struts excessively, for Comfort, the wife is also, since she's less tolerant than me. With the capability to dial it back to sport+ mode and more importantly yet having the capability to individually dial my own shock strut damping settings, on the fly, Without crawling under the car. I have a race car that I tune with 4-way shocks Springs & swaybars etc Etc, this is just the fun car, don't want to work on it too hard so a push of the button or a transmit from the Android phone and I'm hoping for a much better Comfort ride, without losing any control when I want hiperf handling.

Also the KW recommended ride height settings appear to be about three quarters of an inch lower, which I think will look about right, surprisingly this SLK 55 sits higher than my stock naturally aspirated Pontiac Solstice, which I sold to get this SLK.
The 55 does sit lower than the standard ones which translates to less travel on the shocks, but I do agree that the P30 is more harsh on us than it needs to be. Hopefully the KW coilovers will remedy that.

Good comment on SS lines judge, I'm adding that to my list, along with a powder coat of the calipers, to what I think is a more appropriate color instead of the yellow they are now. Was yellow the stock 55 color on calipers?
No way Jose. At least here in the EU we got silver plastics on the brake covers. Link to the SS lines:
Stahlflex Bremsleitungen Mercedes SLK 55 AMG (R172) Eintragungsfrei mit ABE! | eBay
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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The 55 does sit lower than the standard ones which translates to less travel on the shocks, but I do agree that the P30 is more harsh on us than it needs to be. Hopefully the KW coilovers will remedy that.
I await your updated post when you get them installed as we appear to have identical rides. My wife does complain about the ride on long drives so this may help. :tu:
 

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Premium Member
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Got my car back this afternoon. Only did highway miles but what a change in behaviour! Much more planted especially in long curves. I'm still on winter rubber but the road was dry and it already felt if higher speeds than usual were possible. I'll measure tomorrow how much lower the car is now (I requested minimal adjustment in ride height) but they tell me it will drop anywhere between .5 and 1.0 cm in the coming weeks.

I wouldn't call this a harsh ride but I will be doing some known teeth shattering roads this weekend that I'm familiar with to learn about the change.

Mind you, my old shocks and springs had 110K km's on them, and I never drove the new P30 setup. I got it with 40K on the clock.

Edit:
I measured the distance between the center of the wheel straight up to the middle of the outside of the wheelarch.
Before KW; Front 34.8, Rear 36.0
After KW install; Front 34.0, Rear 33.5
(all EU in standardized centimeters)

Edit2:
My KW settings:
Front: rebound 10, bump 7
Rear: rebound 5, bump 5
Source: German SLK forum, Mr Wolfgang Weber who is a racer and has a shop that installs KW (a.o.) and has setup multiple R172-55s

Oh, and just as teaser, the before and after of one front wheel ...
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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I started to look into this change and at $5,000 CDN (not inc install), it's not gonna happen for me. I'll just eat more sausage and get a bigger cushion errr butt :wink:
 

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I started to look into this change and at $5,000 CDN (not inc install), it's not gonna happen for me. I'll just eat more sausage and get a bigger cushion errr butt :wink:
5000 CDN would be around 3600 EUR. That's expensive. I can sent you the set for 3000 EUR and that is including VAT but excl postage and possible import duties on your side. You can order them yourself without VAT in Germany @ KW. V3 costs 2K EUR and DDC 3K on this side incl. around 20% VAT. (Germany 19, NL 21) That's a lot of sausages...

Install is one day for an experienced installer (both SLK and KW) and 1,5 day of labour for just KW experts.

Let me know if you want to work out something.

Best thing of course to do a trial run, let me know when you're in Europe and you can have a ride in mine. I think it will convince you. Don't know about your mrs's but mine didn't notice any change (which is good because there were no previous complaints).
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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When I mentioned the (reduced) price tag, she gave me THE LOOK >:D . You know the one, the one that's gonna cost another 3000 Euros etc :wink: (the one where: you're going to spend that much on your car, well I'm going to spend that much on __________ --fill in the blank)

Thanks for the offer but it's not gonna happen in her lifetime :wink: .
 

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Premium Member
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I see, you have a joint account. We like things to be seperated, my earnings are my own to spent and so are hers. Just a monthly deposit pro-rata on income to the joint account for us.

Too bad.
 

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Premium Member 2013 SLK350
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Our missuses will NEVER understand our obsession with cars... it is not easy to explain nor often justifiable either... I don't even ask my wife anymore, I just do it and if she notices, I will say oops, forgot to mention it. Well, since the mod is already on the car it ain't coming off... Rather than the KW, I have ordered the Brabus springs ($250) for now. Claims about a 1" lower ride height. Will see how that works out, and if it doesn't then will consider the BC Racing springs at just under $1000 (see: EBay Link). Of course, it will all look good if/when my Fox exhaust system gets here from Germany... arghhhhh.... bad memory... gotta forget I even said that...
 

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Some pics

Some pics of the before and after situation.
 

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Registered 2012 SLK55 AMG
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68 Posts
Discussion Starter #16
Dropped off the new brakes, then took the rotors back to our shop, they weren't happy on the lathe, so they got the premo treatment on the flywheel grinder. Plenty of meat left, and we'll above min spec for thickness. Surprising amount of material between new and min spec.



Waiting on shipment from kw, and a couple other bits.......

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Super Moderator CA 2012 SLK55 AMG w/P30
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Wow, those calipers look sweeeet :grin:
 

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Since the weather is so beautiful in the midwest, just dropped my AMG off at my favorite local shop, to have them install KW DDC coilovers. They look pretty amazing, getting the WiFi connection also. Hope to have some pictures later. Parts aren't in yet, but I'm sure they will be by the time it's actually spring in a month or two from now.

KW automotive GmbH - Gewindefahrwerke, Rennsportfahrwerke, Sportfedern - KW DDC

Sent from my SM-G900R4 using Tapatalk
I put the same coilovers to my r171 two years ago and very happy with the result.

Enviado desde mi SM-N910F mediante Tapatalk
 
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