e55 addict

Got my trans serviced on my 09 C63 Sedan at my friends garage. They ordered everything directly from MB. They used the Alldata procedures and did a TCU reset. Now while the shifting is way smoother it lost the crispness in the shifts I have grown to love. Will just driving it aggressively help the TCU relearn my driving style or is it supposed to be that smooth and I just didnt realize the fluid was shot.

CoolBDPhenom03

If there wasn't anything "wrong" with the transmission fluid before the service, then it's just the need to relearn your driving habits.

Merc63

I don't recall noticing a difference after doing my own tranny flush.

Not sure if we reset the tcu though.

Try manual mode, see if its the same still.

callmiro

After a TCU reset, you have to drive it like you stole it. This way the TCU will learn to be aggressive and your shifts will be more aggressive.

C-63AMG

If someone does the TCU reset, is a tune still on the car?

CoolBDPhenom03

Yes. The tune is in the ECU. You can reset the TCU by following the instructions here, #10:

https://mbworld.org/forums/showthread.php?t=249371

C-63AMG

Thanks CoolBD,

So I can do the TCU reset, drive the beast like it's stollen by someone who has nothing to lose and get more aggressive shifts etc?

callmiro

Yah man...that's the idea...

The tranny is adaptive, so if it was driven conservatively in its early miles, the tranny adapted to that conservative style. If you reset it, it will re-learn based on how aggresively you drive it after the reset.

CoolBDPhenom03

I asked the question months ago, but no one seems to know how long the learning process is or if it cycles as you drive more.

Even Money

I suspect that just as it will adapt to a more aggressive driving style, it will adapt to a more easy driving style as well. So, you have to drive it consistently the way that you want it to perform.

callmiro

I think the logic is that your first couple of hard, hammer down, pulls should be as aggressive as possible for the tranny to pick it up....if you let off during maximum pulls, then the tranny will adapt to that and not shift as hard or hold as long....

So re-set, and then find some open stretches and open the gates of hell.

C-63AMG

Am gonna do this and rape this ***** like it's the last day of the world.

C-63AMG

Thanks - just read. How do we know if the TCU reset or not?

10) Steps to Reset the TCU. Resetting the TCU will reset transmission to factory shift points and the car will 'relearn' your driving style.
(1.) Turn the ignition key to the on (not start) position.
(2.) Press the gas pedal to the floor and hold for five seconds.
(3.) Turn the key to the "off" position (don't remove the key), then release the gas pedal.
(4.) Wait at least two minutes for TCU to reset.

callmiro

I just disconnected my battery overnight

C-63AMG

Sure fire method bud?

So I just need to disconnect either the + or - and reconnect 10 hours later and the TCU will be reset?

callmiro

Yah....you don't have to wait that long....i've heard others do it for anywhere from 10-30 minutes....

I just did it overnight while the car was parked

CoolBDPhenom03

I've noticed that the gear changes adapt every so often, but I don't know what the time period is. I wish I could get a straight answer. If I track the car, I want to know how long it takes to "normalize."

e55 addict

Been driving the hell out of it and the shifting has gotten noticably quicker and more aggressive. Shifts fast and holds the gear like it used to

callmiro

Awesome!

I feel sorry for any M3's in your area!