The Vital Importance of Resetting Adaptation Pressure Values

matreyia

Lieutenant
Apr 19, 2017
931
I want to report and stress the importance of resetting transmission adaptation values (pressure values) after every fluid/flush/filter change as well as every time you change the amount of fluid inside the unit.

For example, if you overfill and reset your adaptations values, then you perform your unit’s recommend drive procedure to re-adapt the pressures, and later on you decide to recheck your fluid levels…and you find that you were overfilled…then you release the overfill amount to normal fluid levels; you absolutely should reset your adaptations values and go do another re-adaptation drive procedure for that new level.

This is because your mechatronic unit has already recorded the pressure values based on the previously overfilled fluid level - which means that it will shift at strange rpms and feel “off”. While this is an annoyance, it also does do damage to your valvebody and all the fragile pistons and solenoids. Over a long time, the mechatronic will eventually slowly settle with the newer values, but by this time, the damage will be done and the life of the valvebody is shortened considerably.
It is supremely important that you reset values and do adaptation drive procedure for the exact amount of fluid inside your unit and avoid any changes to the levels after the adaptation drive is done.

This is especially important for those who are tuning and increasing power levels on engine and transmission. You do not want a miscalcuted shift point under super high throttle/rpm.

And what exactly does “let the fluid come out at a slow drip” mean? When checking or filling fluid and following exact temperature and mechanical shifting patterns - at the time of the final filling stage when the transmission is at operating temperature, the fluid should literally dribble out of the fill hole. It should NOT flow out faster than a dribble. If there is a continuous stream, however small the stream size might be… this means there is too much fluid. Ask me how I know this - how I found out about all the things written above.

I want to save you the wasted time that I spent doing adaptations over and over trying to match exact fluid levels and pressure values. Do it right the first time and don’t panic when the fluid flows out of the hole…just relax and let it come to a slow dribble, then put the fill plug back on. As long as the temperature is correct and not over 122ºF with the engine and AC on…your levels are correct. Don’t be scare when you see fluid flow out of the hole… like I was so chickenshit about it.

Good luck to all.
 

matreyia

Lieutenant
Apr 19, 2017
931
Trans adaptation values cannot be reset via apps you listed. INPA or Schwaben scan tool is required.

Vt
 

MacBB55

Specialist
Jul 22, 2018
80
Northern California
so I have A 2004 525i with about 121k on the engine, before I bought it the old owner said it was misfiring, long story short he took it to shop and got the plugs changed which stopped the misfires but gave the car a lil studder, I ran some injector cleaner thru it and it stopped bogging out studdering kinda and now the rpms will bounce sometimes, its kinda weird actually but everything with the tranny seems fine, all the shift points everythgin, when I floor it I can feel it grabbing. im wondering if doing a reset would make any difference at all? im almost positive it hasn't ever been done on the car before.
 

matreyia

Lieutenant
Apr 19, 2017
931
so I have A 2004 525i with about 121k on the engine, before I bought it the old owner said it was misfiring, long story short he took it to shop and got the plugs changed which stopped the misfires but gave the car a lil studder, I ran some injector cleaner thru it and it stopped bogging out studdering kinda and now the rpms will bounce sometimes, its kinda weird actually but everything with the tranny seems fine, all the shift points everythgin, when I floor it I can feel it grabbing. im wondering if doing a reset would make any difference at all? im almost positive it hasn't ever been done on the car before.
That does not sound like a tranny issue. You are possibly past the threshold of changing fluid and filter. At this point if you do change fluid and filter, then you will most likely also need to take out the valve body and clean it, replace solenoids with new ones, then do a re-adaptation drive. Otherwise, there is no telling how much gunk is in all the passage ways and clogging up solenoids. As for the friction disks... they are quite robust and I do not think they would slip after a fluid change EXCEPT for in the case of the car being abused for all those miles...then you have to change the friction clutch packs as well. If this is the case, then it is cheaper to replace the transmission entirely instead of paying for these repairs.

If the tranny isn't broke, then don't touch it.
 
  • Informative
Reactions: MacBB55

MacBB55

Specialist
Jul 22, 2018
80
Northern California
ok thanks, an ya to me it don't seem like a tranny issue either, the car isn't throwing any lights so im kinda stumped as to what it could be, I have noticed that lately it has been doing it a lil less but it still is there, I have noticed also that when I am lower than a quarter tank of fuel that it is more likely to do it, also if I have the ac on and I am low on fuel when I try to accel from a stop sometimes the car feels like it dies almost completely but then I legt off gas for a second then press gas again then car will drive fine, do u think this could be some kind of air flow problem? I ask cuz under the hood right where the oil filter housing is sometimes u can feel a steady stream of air that definantly has some force behind it, I have not been able to track cause of this but it don't feel normal, I will try to reproduce and post video in new thread
 

matreyia

Lieutenant
Apr 19, 2017
931
ok thanks, an ya to me it don't seem like a tranny issue either, the car isn't throwing any lights so im kinda stumped as to what it could be, I have noticed that lately it has been doing it a lil less but it still is there, I have noticed also that when I am lower than a quarter tank of fuel that it is more likely to do it, also if I have the ac on and I am low on fuel when I try to accel from a stop sometimes the car feels like it dies almost completely but then I legt off gas for a second then press gas again then car will drive fine, do u think this could be some kind of air flow problem? I ask cuz under the hood right where the oil filter housing is sometimes u can feel a steady stream of air that definantly has some force behind it, I have not been able to track cause of this but it don't feel normal, I will try to reproduce and post video in new thread
It sounds like the previous owner installed a bucketless low pressure fuel pump. Or your stock fuel pump bbn is going bye bye.
 
  • Informative
Reactions: MacBB55

MacBB55

Specialist
Jul 22, 2018
80
Northern California
yea that's what my thoughts were too, im only at 120k miles but the car is 14 years old so I imagine it probably sat with gas in it from time to time for at least a few months at a time over the years. everything else runs great and there are no lights on I just cleared the one that was due to the rear pads. is there any way to check the fuel pumps that isn't too advanced? I also have a working k+dcan cable as well as software if that will help
 
Top