2012C63AMG

I had an older C63 and upgraded to the newer one with MCT since I hated the older transmission and felt it to be the weak part of the car.

My first few weeks of having it I sent the car back to the dealer and described my probably as when I get on the gas I felt like the computer was slipping the clutch. Most notable if I am on the freeway down shift and punch it in say 4th gear.... (I would say 50/50 chance it does the "slip thing") Other times on the street I would go from 4th to 3rd the RPM'w would go up then BAM it felt like the clutch connecting and getting full power.

This has also happens at slower speeds and lower gears, the RPM's will go up then it feels like it catches and the power gets delivered. I can't tell if its the traction control limiting tire spin at these lowers speed, but I remember my old car the TC light would flash quite frequently, this one doesn't as often. (I have an LSD in the 2012 that I never had, so I don't now if that can play a part)

The only reason I ask if others are experiencing anything like this, is the past few weeks as its gotten hot out I feel like I am getting more slip, and initial 1st gear starting out is being finicky. (I drive in M mode 98% of the time)

natman316

hmm never got that "clutch slipping" feel. maybe something is wrong.

all i know is i hate how jerky the MCT can be and the delays in M mode lol.

otakki

Didn't know that C63 had a different transmission other than the MCT. What year did the C63 switch over to the MCT?

Guilty

2012

BerBer63

turn off the traction control completely and see if it still happens...if not might be the trans slipping from poor adaptations. Don't know much about the MCT, but it happens on the pre-facelift 63s if your trans isn't adapted from all the stop n go driving. Find a quiet area and keep punching it, should get better.

gthal

The MCT slips the clutch when traction control kicks in (in addition to applying brakes, etc). This was done to make ESP intervention less obtrusive. There is a write up on the AMG PL on this... this is also one reason why the 2012's overheat on the track with ESP on. Try ESP off or in Sport mode to see if it improves. If it does, then all you need to do is upgrade the tires to something stickier Wider, stickier rubber cures almost everything...

2012C63AMG

Thanks, that makes perfect sense. I guess what gets me is the fact that the TC light doesn't come on as much as it did to my prior C63. A

I tried turing ESP off and did similar acceleration and can feel the power get delivered but unfortunately the tires cant handle it(Will be upgrading to PSS 265 or 275's soon, like I had on the last one). I am kind of disappointed how over reactive and the method it uses to slip the clutch.....

Does anyone have any MCT vs prior comparisons on 0-60 or 60' times, I almost feel the MCT cars are cutting too much power.

Jons95c36amg

I think the c63 older tranny is fast for a slushbox.

Harold1898

I have a 2012 and have not experienced this problem. Maybe I drive too softly for it to be a problem.

Faraz

Try resetting the ECU/TCU - then hit it in sport plus with sport traction on. Let it relearn. Give it about 10-15 mins of spirited driving. As you tap the brake it should downshift, let it stay in a higher range and hit it again, it should go back to norm.

If you drive kinda slow most of the time, I noticed the trans gets confused and power delivery isnt so great.

PetroC63

A Weistec valve body will help immensely with shift speed.

http://www.weistec.com/7229vb.html

sbce90

I 'think' I know the feeling you're talking about. If you got WOT and there is not TC/ESP light but you feel like it is not full power, then a second or so later you can feel it going at 100%? I just assumed it was the car limiting itself. With semi-slick tyres and Sport or Esp off I don't really get this problem.

2012C63AMG

Yep 100% what I am talking about.

Ive also had it do some odd things in M mode, when I am shifting at like 3k RPM taking off normally from a light (30% power), I will shift and the RPM won't change more than a few 100 (yes 100 not 1000's) and it has to be slipping since my speed is increasing and it just feels odd reminds me of a CVT transmission is the best I can describe it. And if I increase the power when it does this the RPM's will go up then it catches and drops back down... This is easy acceleration. Its only done this 3 or 4 times in my 5k miles I have on it. But the other issues I posted above happen more often.

I think they need a software update. I will keep my phone ready and hopefully catch it doing some of the odd stuff on video.

2012C63AMG

Sorry but this won't fix it.... This is either a software or hardware issue with MCT. I have done this, and I have also had the dealer do it.

I drive M mode 98% of the time, I find S and S+ worthless. I don't know what they did when they programed it but the pre 12, S mode was from what I remember much better.

mainly

funny, im the opposite.

i find the paddles useless.

since it takes, like a full second from the time you pull the paddle to the time the gear actually changes, it makes for a pretty unengaging driving experience.

i use only s+ mode. (cls63)

otakki

Same here with my e63.

gthal

That might be true on the CLS63 (don't know) but on the 2012 C63 with MCT, paddle shifts are VERY fast. No where near a second... maybe a 1/5th of the second. Compared to my last car with a true DCT (an E92 M3) the C63 with MCT is only very slightly slower.

bmoney12

I agree....there's no lag in my shifts. It's a solid step up from the tranny in 2010 c63 I traded in and not quite as good as my previous B8 S4 or E90 M3. I hope they go the extra mile and get dual clutch in the next gen.

2012C63AMG

X2.... I don't know what they are talking about... I would guess the slowest the MCT shifts is around 200ms (faster than the old one at its best) under light load and of course it his 100ms near redline shifting.

I drive in M mode mostly so I can hold a reasonable gear driving on the road, S and S+ will both put me in 7th gear driving 50mph down the road.... I prefer to keep it in 4th or 5th so I can downshift one gear and have reasonable power vs waiting for it to downshift from 7th to 3rd.

sbce90

I usually drive in C 90-95% of the time... no joke.

Harold1898

I am with you there mate.

gthal

Should have bought an E Class...

mainly

i thought the 2012 cls has the same transmission as the 2012 c63 no?

regardless, the shifts are SLOW to happen, when using the paddles.

maybe not a full second, but at least .7 or .8 of a second.

and its not that the shift itself is slow. its actually really fast,

but im saying theres a delay of almost a second, from the time you pull the paddle, to the time it shifts.

which , to me makes it pointless. and makes the car feel unresponsive.

what i dont get is, if the transmission is capable of excuting the actual shift that fast, why the need for the big delay?

i wonder if that can be addressed with a tune...

im prob on the wrong forum here, since im referring to the cls63 2012..

but whatever

gthal

I'd get your car checked then. There is no such delay on my C63. As soon as I "click" the paddle, it is then almost an instant shift. In daily driving, the C63 is almost as fast as the DCT in the M3 which is REALLY fast. The difference is small.

natman316

same here. its annoying, i've hit the rev limiter on many occasions because of how slow the paddle reaction is.

i could drive in s+ but that is boring, kind of like playing grand turismo in automatic.

not really. Never driven an M3 but my friends audi tts with a dsg gearbox is much much faster to react to paddle pull than my car. the shift itself isnt bad, but its the lag from the paddle. like i've said earlier, i've hit the rev limiter a couple times because of this, i have to learn to shift a little earlier than when i want it to change.