A8 Learn/Unlearn Question
Thread Starter
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
A8 Learn/Unlearn Question
Probably my imagination but seems like after my car sits for more than a week, I get the rough 2-1 downshift until the tranny warms up. Is this due to the internal temperature of the tranny fluid or does the tranny unlearn while it sits unused?
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Might be the "converter drain back" issue that has been talked about. 
https://www.corvetteforum.com/forums...eating-a8.html
Regarding your delayed engagement when you first start the vehicle. Give this a try, when you start the vehicle. Wait 30 seconds before moving the shifter out of park. This give the transmission time to fill the torque converter. I recall speaking with you on the converter bleed back condition and a service kit is being release shortly.
Thread Starter
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
Might be the "converter drain back" issue that has been talked about.
https://www.corvetteforum.com/forums...eating-a8.html
https://www.corvetteforum.com/forums...eating-a8.html
Racer
Joined: Aug 2007
Posts: 354
Likes: 101
From: Louisville Ky
Fast learn only works on a8 cars that were built on or after sept 29th 2014, the first 9000 built do not have the fast learn option and have to go through a drive cycle process that is time consuming and doesn't work very well.
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Drifting
Joined: Jun 2008
Posts: 1,365
Likes: 364
From: California
Don't understand all the issues, in the past most if not all of the Automatic cars I have owned function fine after been driven a short distance. I have a early A8 that functions like a champ that I am completely pleased with. The shifting is great when running the 1/4 at the strip, don't know how it could be any better. I don't track the car so the trans never get hot.
Thread Starter
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
Safety Car
Joined: Mar 2009
Posts: 4,101
Likes: 719
From: Northeast MA & Mad Beach FL
Once the trans learned the way you drive it doesn't change unless you start driving different over a period of time.
And it does not just learn the way you drive and then stop learning .... It's always learning.
If it works fine after it warms up, and works the way it has learned so far, that should tell you it has not forgotten what it's learned
IMO it has to do with the Trans Fluid temp and possibly in combination of the torque converter draining as mentioned.
Good Luck and hope everything works out
Drifting
Joined: Dec 2013
Posts: 1,519
Likes: 212
From: FL
Pro
Joined: Oct 2001
Posts: 668
Likes: 26
From: Wadsworth Ohio