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I’m thinking of lowering my C400 while I’m doing my brakes in the near future. I did A LOT of research and also reconfirmed the 2015 C400 suspension is different than the C450 and C43. Therefore springs for the later models wont fit the C400.
Appears Eibach U.S. doesn’t offer springs for the C400, however Eibach Germany does. I found part number E10-25-036-10-22.
Anyone with a C400 running these specific springs? Thanks!
I don't have any information about these specific springs, sorry. I know you are not new to this, so I'm sure you've considered coilovers, but I'd like to share my experiences as some information for you or for anyone else thinking of changing their suspension components/ride height.
I was going to swap to fixed lowering springs myself initially, but my primary concern was having no control of the exact ride height. I've seen some W205's with fixed lowering springs where the gap (from tire to fender) was mismatched front-to-back, which would drive me nuts... but that's just me. Also, once it's done and if you don't like it, that's it, you can't change it except to swap back to the original springs.
I understand cost is important, as lowering springs are generally only about 25% of the cost of coilovers, so that's obviously also a consideration. IMO, if I were to go with springs only, I would go with adjustable springs. Just as a real-world example; in the first year, my rear coil springs have settled down about 3/8". Since they are adjustable, I can and did adjust them up a bit to compensate. (since I'm so low, any more drop adds scraping sound effects, lol)
Some of the advantages of coilovers:
Can be adjusted at any time for exactly the ride height you're looking for, from slammed down to stock height and everywhere in-between. You may want it lower now, maybe you want it stock later, you can do that without changing parts.
Sharper handling. My cornering really tightened up switching to coilovers and they eliminated the somewhat "loose" factory handling feel. I think some of this is gained by the beefy aftermarket top hats and bushings/bearings.
Adjustable dampening. This one is huge IMO. Mine have an adjustable range from 1-24 (1=soft-24=hard) that allows fine tuning your ride quality and handling performance. Riding too rough for you? Dial down the dampening to go floaty. Going for a track day or for fun? Crank it up to hard and the car handles like a slot-car. Just FYI, I currently have mine at 14 front, 12 rear for a balance of comfort and handling, leaning more towards comfort.
The best of luck to you, whatever way you go. I look forward to seeing pics of your car after!
Thanks guys, appreciate the insight. Definitely the money factor weighs in, as you noted, adjustables / coil overs are significantly more than just springs. For the amount of driving I’m doing (at least for now), not sure it’s worth the investment for me. Little better ride and a lowered look is what I’m going for.
I will say that stock, my drivers side front is higher than the right, noticeably (at least to me). I had the dealer look at it years ago, said it’s within spec. Begs the question what would happen with non-adjustable springs.
So, we’ll see. I reached out to Eibach to check the part number, but haven’t heard back yet.
BTW, love what both you guys have done with your cars, nice job!
I totally get it. I hope their response is good and you can use these springs.
I have something similar going on with my front left-right height also. I never noticed it when it was stock, but when I swapped to coilovers, I set both front left & right height adjustment collars to be equal... which I think anyone would assume to be correct. However, with the car on level ground, one side was higher than the other (front only). I can't remember which side it was now, but I had to set one of the adjustment collars about a 1/4+" higher than the other to get the front level. I thought it was strange at the time, but who knows why. (?)
Thanks for the compliment brother! It's a work in progress that appears to be never-ending, lol.
I’ve been communicating with Eibach. They think the part number below would be the right springs for the C400 sedan. Unfortunately Eibach US can’t 100% confirm, since these springs aren’t offered in the US, and the UK C400 may (or may not) be the same. E10-25-036-02-22. So we’ll see, I’ve got front and rear pads and stock rotors stilling in my Autohaus Parts Delivered cart, need to get this stuff going!
Last edited by Darrington; Sep 1, 2022 at 06:18 PM.
Reason: Updated vendor to Autohaus Parts Delivered, got a smoking deal!
I took a chance and bought this kit, just installed the rear springs. I searched, but couldn’t find the torque spec for the rear control arm to frame. I torqued it to 65 ft-lbs, but would like to do the factory setting.
Also, I didn’t read anything on the nuts being one-time use, so assume it ok to reuse. Thanks!
I took a chance and bought this kit, just installed the rear springs. I searched, but couldn’t find the torque spec for the rear control arm to frame. I torqued it to 65 ft-lbs, but would like to do the factory setting.
Also, I didn’t read anything on the nuts being one-time use, so assume it ok to reuse. Thanks!
Hi, I just picked up a C400 and I'm in the same boat regarding the lowering springs! Any updates or issues regarding fitment of this spring? Thanks!
Hey. Congrats on picking up a C400. I love mine. Install went fine, and the drop and handling is great. I installed on the stock struts.
My only complaint is the front sits a bit higher than the rear. I was aware this was an issue with the H&R springs, but not the Eibachs. Ironically, a few fellow former members shared their foreshadowing experiences with ride height above.
I’m wondering if I swap the struts to Bilsteins if maybe the perch is a bit lower. Still debating.
For the cost, I’m very happy with the look and improved handling. The ride actually feels less rough, but also tighter.
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