Hey all, my 2020 GTC is eurocharged stage 2 and the shifting seems a bit sluggish, sometimes the car ends up in 5th gear at 30mph when just cruising around in sport + or race mode without stepping on it.

Is their a way i can try to reset the transmission learning so i can have higher rpms at lower speeds?

thx!

 

The transmission adaptations can be reset, but as far as I know full reset has to be done through XENTRY. If you google you find instructions that involve pressing the throttle pedal a few times while the engine is off, but I think that only worked on some older models. Today's transmissions are a lot more complicated. However, what you are experiencing is pretty normal. If you drive relaxed, then even Sport+ will eventually go into higher gears. It adapts to your current driving style. It stays in lower gears if you drive dynamically as in diving into corners and such, so it holds the gear for corner exit. But if you are just doodling along, it will eventually categorize you as a sedate driver and start upshifting into higher gears. Resetting the adaptations won't change that, unless you adopt a different driving style in the future. Sport+ is meant for actually sporting driving. The AMG Instructors at the AMG Driving Academy made a point on this by saying don't use it a low speeds, otherwise it'll just learn a lazy driving style. Ultimately, there's always manual mode. I drive my performance cars in manual mode about 90% of the time. I only let the transmission shift automatically when I'm in Comfort mode. My individual mode puts the transmission in M for example, and I use I* on the highway and open roads. When I hit up a fun road I put it into RACE mode and M. Having driven manual transmissions for over 25 years, manual mode is really the only way for me to drive these cars. As good as the automatic shift programs have become, they can't read my mind, so only manual shifting keeps me in the gear I wanna be in at all times.

As far as your tune goes, do you also have a TCU tune? The TCU and ECU work closely together and if you just tune one, then the other won't be in sync and potentially make decisions that are no longer optimal. That's the thing with engine tunes. The rest of the car is still operating based on the engine's tock tune. So ESP, the transmission etc. may not perform optimally when the engine produces more power/tq than they expect.

 

FWIW, somewhere I remember reading that it takes about 40 shifts to adjust programming. I interpreted that to mean that there's about a 40-shift running driving-style categorization history that's kept and used to program the shift points. This may or may not be actually/behaviorally what's happening but changing driving style will eventually cause some adaptation in the shift-point programming.

 

I don't know if the 40 shifts is accurate. I never read that. But adaptation happens continuously. I was never a big believer in resetting the adaptions. If you want the transmission to shift differently, the best way to achieve that is to change one's driving style. It will eventually adapt to that. I did European Delivery with my car and the fist 6000 miles were mostly high speed driving on the German Autobahn. As a result, city driving was rather rough. It wasn't until my car arrived in the US and I did more around town driving when it adapted for smoother shifting at low speeds. As I said, I also strictly stick to the appropriate mode for every driving situation. I use Comfort around town and for long distance highway journeys, my personalized individual mode for regular highway and spirited driving, and Race mode for canyon/fun road driving and I don't mix casual and spirited driving. I always use manual mode for spirited driving, so my transmission only ever had to learn my casual/normal driving style.

 

Shift it yourself using the paddles. Then you won't have to worry about what a computer thinks is best for you. My programmed driving mode lets me shift for myself. Or you can just press the button on the center console.

 

Try disconnecting battery for a few hours.

 

I don't think most of the responses so far have addressed your concern so I'll give it a shot.
Retraining your shift points is not something you can do yourself so thats that.

For explanation:
No it's not normal behavior for the car to lug around like that in those modes when it's stock. You have to drive lazily for a while (weeks/months) for the car to come that close to being lazy around in sport plus and Race modes. And that doesn't last that long lugging around.
I however did notice the same thing happening to me in the first two AMGs I tuned. I believe the poster who mentioned mismatched maps if you did not tune your TCU is right on the money.
I did tune my last AMG, but I also tuned the TCU and CPU. Never had that issue with that car.

 

In the city and around town, this car is really only drivable in C but then its soo quick to jump to 7th gear. Ill be stuck in traffic crawling 15-30 kmh but the car will be in 7th gear because of which i always have to keep gently applying brakes every 5 seconds and then they dont like that and start making noise (ccb)

would a reset help in retraining the transmission to hold gears a little longer or i shouldnt expect that in C mode? I know I could use manual mode but that wont be comfortable/smooth stuck in traffic. First world problems

 

No. C is not programmed/designed to hold gears longer on light throttle. It'll only do that if you go WOT and kickdown. Otherwise it's shifting up quickly for two reasons. Reason number one is to keep the revs low for better fuel consumption, and reason number two is comfort. It's more comfortable to cruise in a high gear, because you don't get excessive engine braking whenever you let off the throttle. The car kinda glides in higher gears and slow speeds. The downside is you keep having to ride the brakes to slow down.

The GT and 63 models don't really like being driven at slow speeds. That's not what they are designed for. These things are designed for faster speeds on the open road. The 43 and 53 models are designed for lower speed driving such as one encounters in city traffic. I've long pointed this out. I love the AMG 63 models and the GT, but they are not daily driving city and commuter cars. You can certainly daily them, but there are better cars for that. You can daily drive a Caterham if you are mad enough, but it doesn't mean it's a good idea.

 

with the c63s i actually didnt have any issue in traffic and always drove it in S mode. I think with the GT im just feeling it more because of the sporty nature of the dct and its different nature vs the mct. Maybe thats why the new GT is back to mct to make it more liveable as a daily

 

If I'm not mistaken, you had a PFL C63 with the 7-speed MCT. The 7-MCT had longer gears and started in 2nd gear in C. The 9-MCT like the GT R's DCT has much shorter gears. The first seven gears of the 9-MCT are shorter than all 7 gears of the 7-MCT and it always starts in 1st gear. On the other hand 8th and 9th are taller for better highway mpg. I'm in 9th gear at 40 mph essentially. Short gears makes a transmission livelier, more direct and more sporty, but it also means it has to upshift earlier, because the top speed in each gear is lower and the revs climb quicker. The FL C63 is 1/10th of a second faster to 60. Same power as the PFL, but the shorter gears make it accelerate faster. The 9-MCT has a crazy short 1st gear. I'm like in 3th gear after barely moving from a stop. I've tried S around town. Sometimes I like it, but most of the time I drive in C, because S is already too aggressive. For normal driving I'm fine with being in a high gear, but if I need it to be more responsive, I drive in M. As I've mentioned before, I drive about 90% in M. The PFL C63 was largely undrivable in C, because of the slurry 2nd gear start. Despite upshifting quickly, C with the 9-MCT feels much sportier, because of the shorter gears and always starting in 1st from a stop. Similarly, the GT R is geared for the track. It has shorter gears than the GT, GT S and the GT C. Actually, on the GT C I'm not sure anymore from the top of my head as it is essentially the touring version of the GT R. I don't remember if it got the gearing from the GT S or the GT R.