brad65ford

Been following along with this thread. Strange how this happening to some and not all, also strange since this plate forum is now 3 years old one would think AMG would know whats going on.

GordonGEICO

There is a YouTuber named AutoVlog who took delivery of a freshly-built C63S a couple weeks ago and he doesn't have any problems doing burnouts or spinning the tires. I wonder if this exhaust update has gone through some iterations that some vehicles don't have yet.

What is the sample size of people experiencing this issue?

brad65ford

Seeen his videos guy can't even do a burn out with almost crashing lol. These new gen of car nerds don't do thief own mods either these days sad imo. Regardless of this issue these cars even stock once in boost and a little brake applied will surely roost the tires especially with the amount of tq they have. The op may have something else going on causing the dramatic delay of throttle/power. Look forward in hearing what the dealer finds out for him.

Tvall13

This guy lives very close to me and I have actually talked to him about my issues and he said his does not feel anything like mine does. I might have to meet up with him.

Tvall13

Update from the dealership:


I called the service manager this morning to tell her about everything that has happened. I told her the shop foreman told me he drove my car back to back with one on the lot and it felt the same. I said I'm not sure what he drove since you don't show a C63s or even a C63 coupe or sedan in your inventory online and haven't for the last two weeks.


I also told her that there is no way a 503hp car with ESP off should not be able to spin tire flooring it in 1st gear. You could do that in a V6 mustang. I told her it felt just like the 4 cyl CLA I drove at the AMG Academy and that the C63s at the AMG academy didn't feel like mine at all.


She was very helpful and said if we need to get a Mercedes rep to come out and look at my car we will and if we need to escalate it to the next level we will. She acknowledged there was a problem and said they would do everything they can to help.


They will be calling me Wednesday and said they might even be able to drive the car the shop foreman drove out to me to let me test drive it. I will keep everyone updated on this issue.


I did say that even if the new car felt the same this isn't how my car felt before and it's not how other people feel after the exhaust update. She agreed.


Stay tuned.

Tvall13

I think the other thing to consider is that Mercedes claims peak torque from 1,750 - 4,500. I do not have much power at all in really any gear at 1,750. If I stomp on it at 1,750 in any gear there is still significant lag until at least 2,750 and peak certainly doesn't come in until at least 3,000+.

auditoamg

It's this exactly.
Further, when the turbos do finale spin up, it's not linear....
It's freaking scary!

Tvall13

Yes, my feeling exactly. It feels like my old Evo. Tons of lag and it hits you all at once. The difference is the Evo was 300hp and this is 500.

When this car first came out they bragged about the turbos in the "hot inside v" which gave virtually no lag. Now it feels like the Evo Or CLA45 which are tiny 4 cyl. with tons of PSI and lag. How they can tell me it feels normal is absurd but they make it so difficult sometimes you start to think you don't know how it felt before or that you're wrong.

ezatnova

Thanks for the updates regarding the dealer, man. Good to hear they are working with you.

I unplugged my battery (negative terminal) today for 15 minutes and it did jack squat except made the car run super rich at startup lol. Same awful lack of power below 4000 rpm as before. So infuriating.

I think there here is a huge potential to capitalize on you living here Mike from Autovlog! I bet he would be willing to do some side by side comparison videos of both of your cars and publish it on his channel. This could be the momentum we need!

I'll PM you with my email (and Audi2AMG and anyone else impacted maybe do the same) and maybe we can get in an email togethet with him about what we're experiencing and hope to accomplish.

I'll be calling the dealer later this week.

Thanks agaib for the updates. Hopefully we make some progress this week. The problem is the forecast is all rain all week after tomorrow so that won't do any good. Hell, the car might even be able to spin the tires with wet roads, then they wouldn't believe me! Lol

brad65ford

Where are you located Tvall13?

ezatnova

All,

I put three videos up on youtube of my car.

All were done in Sport + from a full stop to full throttle. You will notice that there is almost no boost until past 4k rpm and ramps to full boost by 5k. You will also notice that on the ESC on videos, there is no flashing of the ESC light until after boost finally kicks in. And on the ESC off video no tire struggling until after this same 5k+ RPM timeframe. The car is a DOG below that in first gear. Can't even make it struggle for traction at all.

Can some of you who don't feel you are impacted (or have not gotten the update done yet) upload comparable videos please?

Thanks

Real-time ESC on

Slow-motion (you can really pinpoint when boost finally decides to start) ESC on

Real-time ESC off. It's like an EVO or single turbo supra lol. I was shocked I got it to finally break traction even a little. Still, nothing like it used to be where you'd give it more than half throttle from a stand still and the tires would not be happy and you'd start to get the rear end kicking out.

brad65ford

Good video work!

In your last video was there any letting off of the throttle?

ezatnova

Mashed 100% until after the 1->2 shift.

jkob5

shoot the same vid except in 2nd gear. 1st gear is weird on high hp cars. Start at 1500 rpm in 2nd gear (in manual mode) and let's see that.

Tvall13

i have the same problem and I can tell you at 1,500 rpm in 2nd gear there will be still tons of lag and tires will not break

ezatnova

Lol, no they aren't weird. All my high horsepower cars (INCLUDING THIS ONE WHEN I BOUGHT IT) simply roast the tires in first.

Also like Tvall said, the lag or lack of boost is there in every gear below 4K

jkob5

I'm not disagreeing with you I just want to see when you reach max boost in 2nd.

tekfoc

Check your vacuum hoses from wastegate actuater going in to the turbo's.
one or both are probably pinched
there is a tsb on this issue.
no boost and suddenly you get boost .

ezatnova

Hmm, doubtful since this happened with the ECU update. Don't think it wouldn't have messed with the vacuum hoses from flashing new software.

Any link to the TSB?

AlexZTuned

You have one bar of fuel, try this again with more gas in the tank. I was told by my service advisor that the car will go into a mode to protect itself if it's that low - they actually had to fuel my car up after the exhaust update because I had barely any fuel in the car (and the software update wasn't popping/cracking). After they added a few gallons, everything was working.

Either way, looks like your car may have a mechanical issue, not a software issue... just bring it in and have them check for codes.

Tvall13

2nd gear rolling at 1,500 rpm slow motion full tank

https://youtu.be/pNyPqsgfxwI

Tvall13

2nd gear rolling at 1,500 rpm full tank


full boost doesn't kick in until after 3,500rpm close to 4k

brad65ford

Please tell me thats not floored!

ezatnova

thanks but I had the update done with plenty of gas. Driving it has reduced the gas level.

ezatnova

You realize it's second gear and in slow motion, right? Or do you mean just the lack of boost at low rpms like my first gear videos I posted yesterday?