Diff C63 and C63s
Out Of Control!!
Joined: Nov 2018
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From: San Francisco Bay Area
2019 C63CS
Technically yes, the FL C63 and C63S both now have the electronic locking differential and yes as far as I know both S and non-S have the same final drive ratio. However, the electronic diff has to be coded in so that it works. Obviously you need the electronic part to work as the PFL non-S diff is purely mechanical. Things like the ESP, DYNAMIC SELECT, Race Start etc. have to be coded properly so that they take advantage of the diff and all works correctly, otherwise you just gonna have an open diff.
Out Of Control!!
Joined: Nov 2018
Posts: 11,400
Likes: 5,324
From: San Francisco Bay Area
2019 C63CS
Last edited by superswiss; Mar 1, 2022 at 05:18 PM.
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205 C63
So my diff on the C63 is damaged, I went and got a C63s diff with the same ratio of 2.82,w205 2015, now question is will it work? If so what needs to be done in order to cancel the electronic Part on the C63s
Out Of Control!!
Joined: Nov 2018
Posts: 11,400
Likes: 5,324
From: San Francisco Bay Area
2019 C63CS
I'm not entirely sure what you are expecting here. Should have gone and get the correct part. You don't wanna cancel the electronic part of the diff. Do you understand the difference between an LSD and an open diff? These cars have locking diffs for a reason. The ESP and traction control all factor in the differential, so they'll likely be totally confused if the behavior of the rear wheels doesn't match expectations. I haven't heard of anybody retrofitting a C63S diff to a C63, but that's essentially what you'd have to do and not sure what's all involved, but probably doable with the necessary coding knowledge, but much easier to replace it with the correct part.
Super Member
Joined: Sep 2011
Posts: 509
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From: S. Cali
C63
What's broken on your C63 diff? Why not get it fixed? If you still want to use the C63S diff, you'll need to code your C63 car to use the E-diff. You could remove the E-diff from the C63S case and put your mechanical diff into the C63S case.
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Joined: Dec 2021
Posts: 268
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From: Maryland
2018 C63s
I'm not entirely sure what you are expecting here. Should have gone and get the correct part. You don't wanna cancel the electronic part of the diff. Do you understand the difference between an LSD and an open diff? These cars have locking diffs for a reason. The ESP and traction control all factor in the differential, so they'll likely be totally confused if the behavior of the rear wheels doesn't match expectations. I haven't heard of anybody retrofitting a C63S diff to a C63, but that's essentially what you'd have to do and not sure what's all involved, but probably doable with the necessary coding knowledge, but much easier to replace it with the correct part.
Get it fixed right, there are safety issues as well with an open diff versus the electronic in terms of traction control and how it all comes together, etc.. Just get the right part, or you will probably be doing this job twice at 3x the cost if you're lucky.
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