Vladds

The other day I took a look at OEM locking diffs.
There are many part numbers, at least 6 in total locking and non locking.
There is a separate Black series locking diff part number. This is being sold complete and new at a price that is not higher than a P30 differential.
The factory makes available remanufactured units, including the locking ones at a price around $2600.
I don't think that the black series diff is available remanufactured.
The ratio was the same for all, including black series.

The one thing I don't know is how much extra weight does the locking add to a car. I am a bit worried as in a different posting I found that the 507 seris coupe was quite heavier than the rest of the C63, while the sedan was not and the coupe seemed to be heavier than the other fl coupes (so it's not the glass roof). So I wonder if this means that the locking diff was stock on the coupe and optional on the sedan and the extra weight reflects the locking diff.

I mean if it adds 50+ lb that's significant.

Also, I am still looking for help for a part number weight.
I have the part number of the black series driveshaft and it is separate from all other cars.
The aftermarket driveshaft companies say that their product is for ALL C63 including black series, so they must be interchangeable.
So the black series driveshaft fits a pfl sedan by example.
The price is very good below $1000 brand new
The online suppliers have a software that knows the weight of every part and spits out the shipping for every part.

If such an online supplier was to read this, please indicate maybe out of your shipping software the weight of the black series driveshaft, it's a good opportunity to sell some.

Of course at this stage, we all know the weight of a common C63 driveshaft, so this can be a good thing.

I will post the part number.

skratch77

Im going to guess that the open vs locking diff weight difference is about 5 lbs .

You can pick up the locking diff by yourself and it's about 60-65lbs

zcct04

Vladds,

There are negligible differences between the 507s and the rest of the C63 family, and I would expect the weights to be almost an exact match. Do you recall what you saw that gave you the impression that there was a big difference?

Back on topic - the 'locker' parts in the differential will add a little weight, but I doubt its any more than 5 pounds max. You'll never notice it.

Vladds

Yes, I will link back to my posting with the weight differences.
The information is factual, taken directly from Mercedes.

Vladds

Find the info here

https://mbworld.org/forums/c63-amg-w...r-tekinfo.html

The 2014 coupe is 11 lb heavier than the sedan, which did not change weight throughout production. The 507 coupe is 42 lb heavier than the sedan and the 507 sedan has unchanged weight as compared with the other c63 sedans.

roadkillrob

https://mbworld.org/forums/c63-amg-w...ing-guide.html

507 ordering guide is on this thread, really don't seen anything on a 507 that would add any weight at all and LSD seems to be an option on coupe and sedan, so also not that then.

MBNRG

I believe the OEM Limited Slip Diffs for C63 and other models are made by Drexler - one of the very best manufacturers for LSDs. MB does not make the LSDs themselves.
These OEM units are very robust. Can customize ramp angles and clutch packs to achieve greater degree (%) of lock up on both power, and on coast.
C63 OEM LSD tidbits and inner components, translate from German: http://www.limitedslip.de/service/einbau_c63.html

Weight of an OEM LSD off a CLS63 (which is similar if not the same as C63) ~20.6lbs
Weight of a Wavetrac LSD for C63 ~21.2lbs
Weight of OEM Open Diff for C63 with both side bearings (just the 2 tapered roller bearings, not the races) installed onto Open Diff ~18.2lbs

This was a Very informative read on LSDs, and on a Drexler unit, with commentary on Wavetrac units: thread is on m3post website, titled "Big LSD Shootout... OS Giken, Drexler, Titan, GKN, ZF..." (m3post.com/forums/showthread.php?t=788992)
Driftflo is the handle of Florian, the LSD wunderkind at LimitedSlip.de

chrisridebike8

get the finned diff cover at the same time. definitely worth it if you track the car.

hachiroku

when i hit the lotto or second christmas comes around i plan to purchase an OS Giken unit for my E63

Vladds

I just wanted to add that according to Car and Driver's review of the C63 black series from 2012, the diff in this car is 50% locking on decel, which makes it a very special diff for a production vehicle (but then again the C63 black is not exactly mass produced). Probably explains the external cooler too.

tphss

There's a very small (few lbs) difference in weight between stock LSD and an open diff. The stock LSD in the W204 is clutch/plates type, so you need to replace the fluid every few thousand miles if you drive hard and want it to still lock, work properly and not be damaged.
Factory LSD equipped W204 C63 when new must replace the differential oil after the first 2000 miles.

I have the stock LSD on my C63, but if I didn't I'd buy a non-clutch type LSDs (Wavetrac, Quaife). It requires less maintenance, has less parts, and has the same amount of wear as an open diff (almost no wear with the proper fluid). I can vouch for Wavetrac, I installed one in a BMW e90 335i I had, and it was the best mod I've done. Differential quality was excellent and it worked like magic.

Both Quaife and Wavetrac are torque-biasing, so have no extra maintenance needed. One advantage that Wavetrac has, is that it would still transfer torque to a wheel that has 0 traction, whereas the Quaife will not.
In a simple example: if both rear wheel are on ice, or you have one wheel in the air, the Quaife will operate like an open diff, but the Wavetrac should still send some torque to both wheels. Quaife is a bigger name with more presence, and both will work great and offer the same performance in 99% of the cases.

sventastic82

Coupe's are usually heavier than sedans.
The B pillar on a coupe is farther back and does not give the same rollover protection as the sedan.
Therefore additional material is added to the coupes body.

qmciver