Originally Posted by brad65ford

We all know our frustrated about your updated exhaust situations (surprised it hasn't been resolved yet) but one would ask the question, if you were happy originally why did you change it? Yes I'm busting your ***** Remember altering a car is a slippery slope.

If your looking for everyone to believe or disbelieve you I don't think that will help honestly.

Options:

Talk to tuners since a tune might be all you need and or at least you'll see what the dyno has to say (suggest doing a stock dyno first) see if something is off. We are talking 60-80 bucks for a dyno and its always fun to see what they make and how they are running.

Regarding being happy with the performance of these c63s from stop dead and not making boost right away... Well not having done the exhaust tune update myself i do believe they are slow on throttle tip in, totally different feeling then a n/a or super charged car. I've own other twin turbo (twin scroll) that perform much better with throttle tip in feel. Personally i think these C63s are slow stock (doggy feeling). Merc surely didn't give us the goodies that are seen in the 100-120k cars like twin scroll setups.

Now do something, you already made one mod buy going to the dealer to alter your exhaust for a snap crackle pop sounds. Keep going or trader her in or leave it at the dealer till they find something wrong. Or even find someone in your area that has a c63s and let them drive you ride see if they believe it feel correct or not right.

Sadly I believe your not happy with the performance or feel of the car which i totally hear you. Personally i'm going to tune/exhaust or even work on turbo upgrades to see if it will please me since i'm not happy with it as is. Honestly waiting for Merc or other to answer the fix is like waiting for an OBD11 flash tuning, low cost custom intake kit, or twin scroll turbo upgrade for these cars. Its just such a small market, nothing like mustangs or other domestic mass produced hot rods with tons of options.

Originally Posted by VaserC63S

Gee this sounds like BMW wastevgate fix that nurtured the cars. I know I was one of the pioneers. The original software was registering 375HP but after the update barely 330 HP, and w were all mad. After I while Ethusiasts started recruiting fir a class action suit. BMW eventually admitted to neutering the car and asked those interested to go back in for reflash restoring the old feel. Now Mercedes at it too? Once they start loosing sales and get feedback about unhappy customers they will rectify it fast. Just like BMW did.

Originally Posted by DarkProphet

Im in SE Pennsylvania if anyone wants to compare. I do Not have the update.

Originally Posted by DarkProphet

It's a November 2016 build. I'm about 45 mins north of Philly off the North East extension.

Originally Posted by J.M.G.

Once again: The Soft-Turbo N54 from BMW takes nearly 5 seconds (!) at 1,500 rpm to deliver full boost. Our cars have significantly larger turbos - therefore it will take at least as long as in the BMW, in my opinion.

Originally Posted by J.M.G.

Once again: The Soft-Turbo N54 from BMW takes nearly 5 seconds (!) at 1,500 rpm to deliver full boost. Our cars have significantly larger turbos - therefore it will take at least as long as in the BMW, in my opinion.

Originally Posted by ezatnova

And once again, the car a) used to deliver snapping torque instantly off the line or on multi gear highway downshifts and now doesn't, b) is advertised to make full torque below 2k rpm, which it used to, and now doesn't and c) feels very obviously different now.

This is not something subtle. It's pretty blatant when the car used to try to get sideways on a 6->3 kickdown downshift and now just sort of bumps you along with some urgency.

Originally Posted by auditoamg

It's plainly simple: Car feels dramatically different, in a bad way, post update. Period.

Originally Posted by brad65ford

This!

Adding more to what already is known is not helping, as Albert Einstein says. Insanity: doing the same thing over and over again and expecting different results.

Originally Posted by PaulE550

Did OP ever ask the MB service department to backout the firmware update to see if the car's performance returned? If for no other reason than proving or eliminating the firmware update as the cause of the problem. After all, they must have the ability to rollback software updates in the event the update degrades or changes performance in a negative way. Rudimentary stuff.

Originally Posted by PaulE550

Did OP ever ask the MB service department to backout the firmware update to see if the car's performance returned? If for no other reason than proving or eliminating the firmware update as the cause of the problem. After all, they must have the ability to rollback software updates in the event the update degrades or changes performance in a negative way. Rudimentary stuff.

Originally Posted by auditoamg

I believe we've all asked and been told it cannot be reverted to prior code....
I just had this conversation with dealer yesterday.

Dealer acknowledges car might be different, but says it feels normal to them.
As I drive it every day, I cannot agree.

That being said, they are looking to see if an update has been released.

Originally Posted by PaulE550

Ah, OK. So they are hiding behind that excuse. I guess the update must be also modifying something else in the vehicle, maybe emissions for fleet compliance purposes or something similar. So they are then obviously reluctant to do a software rollback even for diagnostic test purposes.

It's just that I worked on computer systems of all types, both hardware and software, for 30 years and virtually every system, whether it was for commercial or military use had a methodology to effectively rollback any software update installed to the prior version should the new code, for whatever reason, adversely impact the system's performance. So I just find it kind of hard to believe that a major worldwide auto manufacturer like MB doesn't have this capability in the event one of their updates alters the operational characteristics of the car to the point of causing numerous customer complaints.

Hopefully MB will issue another firmware update that at least partially returns your car to the performance levels it had when you originally bought it.

Originally Posted by AlexZTuned

Jeez someone just throw their car on a dyno, get some actual torque/hp readings, and put an end to this.

These slow-mo acceleration videos using in-dash boost gauge and estimated HP/TQ display is not going to provide any data of substance.

Dyno it in 5th gear (1:1 drive ratio) and let's see what the torque reading look like.

Here are some stock graphs for reference (these runs were all done before the new software was available)... I don't see any C63S's with old software making full torque at 2500 rpm or below:

Black lines are stock:



Blue lines are stock:



Light blue and light red lines are stock:



All lines are stock:

Originally Posted by auditoamg

Yes, a rollback should theoretically be possible - there's no reason why not.
I'm essentially in Healthcare IT with a software/coding background.
What I believe occurs is that the package to update, makes setting and various database updates to the vehicle that may be region, country or otherwise specific.
They don't have the resources to then "untangle" those database, settings or updates back to the OLD version, for every new version they create.
In other words, if they change parameter positions in a database, or add functionality that has implications, a rollback version of the ECU code would require knowing which version you are going back to...
It would be resource intensive to create a rollback package for every car.
What they SHOULD do, however, is take a vehicle snapshot (golden master/image) of the code before each upgrade and keep, at the dealer, one prior version - just in case of issues like these.
So, before they upgrade your specific car, they store the current image in case of issue.
Simple.

Originally Posted by PaulE550

Ah, OK. So they are hiding behind that excuse. I guess the update must be also modifying something else in the vehicle, maybe emissions for fleet compliance purposes or something similar. So they are then obviously reluctant to do a software rollback even for diagnostic test purposes.

It's just that I worked on computer systems of all types, both hardware and software, for 30 years and virtually every system, whether it was for commercial or military use had a methodology to effectively rollback any software update installed to the prior version should the new code, for whatever reason, adversely impact the system's performance. So I just find it kind of hard to believe that a major worldwide auto manufacturer like MB doesn't have this capability in the event one of their updates alters the operational characteristics of the car to the point of causing numerous customer complaints.

Hopefully MB will issue another firmware update that at least partially returns your car to the performance levels it had when you originally bought it.

Originally Posted by PaulE550

Yes simple and the proactive approach. From my understanding, when the service techs hook up the vehicle to their diagnostic and software download systems, the vehicle ECU performs a series of validation integrity tests. At that point, MB corporate knows what the build state of the ECU is and validates it against the VIN and last MB software update that was installed onto the ECU. So MB corporate does have a record in their automated database of what the last state of the ECU software build was prior to the update the service tech is about to install. After the update is performed, the corporate database should reflect the new current build data. Problem is apparently MB keeps all actual software and databases only at HQ. Thus the local techs can only do very limited things and only with the appropriate authorization from Germany. No local software images at the dealerships.

Originally Posted by Vassago

I have read through this whole thread and I am intrigued by the findings. My car was delivered in November of 2017 its a the 2017 C63s coupe; I had the transmission software upgrade done to fix the hard shifts from 3rd to 4th. I am not aware if i had any other software updates but i am sure they did them all since the car needed the trans update. I have felt no difference in performance and if I stomp on the gas from a stop in sport or sport + with traction on sport the tires will definitely spin. Also if going around a corner at low speed and i goose the gas the rear end breaks free easily. What would cause some of our cars to loose performance from this upgrade to the ECU and not all of them?