Hey Improve (and others.)
I did PM you about the module and thanks for returning my PM very much appreciated.
What you have done with the lock up converter lockup is great and clearly what people have been wanting without knowing
I have a question and one problem to relay, but am really only asking for an answer for the question (but if anybody wants to comment to the problem feel free.)
Scenario My 2013 7P (rocking horse poo model, 4xMotion, rear diff lock, area view camera, aircon seats as well as heated and memory function, 4 zone aircon with a bluefin ECU tune including EGR delete claimed 220kw, that maybe a bit of a reach but made quite a marked difference🙂 )
I purchased at 150,000kms now at 210,000kms.
The previous owner who i never met towed a horse float, not sure how big or how much towing but i think quite regularly used to tow.
The car is used as my wifes daily driver and our caravan tow vehicle.
I have done i would say upwards of 15,000kms + towing our loaded 2.6t van with 3 passengers in the car.
I have let the vehicle decide what gear to be in most of the time during towing and that has worked with no issues.
Some times i may run in manual mode and preempt a down change for an upcoming hill.
Now the question and issue if you are still with me😏
Last trip in the final 600 to 800kms on the return leg i am getting a fault with the transmission listed as P0741 torque converter clutch stuck off no power being transferred.
This doesn't happen instantly upon towing but will happen every time during towing the van at some time and keeps repeating this fault even when cleared.
To me it is clearly load related as it really happens most times at the start of a climb up a rise.
At no time does this fault happen when the car is not towing the van.
Also i have towed an empty car trailer (700kg) then loaded a box weighing 700kg (1400kg total) and towed this with no issue at all.
I believe it is either a worn clutch in the torque converter allowing slip or an internal solenoid fault in the transmission and the speed sensors are picking up differences.
This may have been caused by a lot of towing over the cars life, and maybe towing in 8th gear with a big load on behind which a lot of people with various cars over the years have advised against towing in top gear.
Any way when it faults out during towing the van the transmission still shifts between all gears just the lock up clutch doesn't work and revs are up at about 2,800 when towing at 100kph and the tranny feels very spongy due to converter slippage and of course you see an increase in trans fluid temp.
Hope you all are still with me.
I am pretty sure it is the torque converter is causing this and to cover any possible transmission related issues causing this i have obtained a low mileage Q7 transmission and torque converter from a wrecker. (VW wanted $5,500 for a new converter and wreckers wont sell a torque converter separate from a transmission)
The donor Q7 also had no tow bar fitted.
By the way all the Q7 part numbers matched my Touareg exactly down to the transmission code so happy days.
When i replace the Torque converter and transmission it will also give me the chance to find and rectify to very common oil leak at the bellhousing to block area found in Touaregs.
This brings me to the question i want to ask.
Would it be possible to program/install an inhibitor with an on off switch to prevent change up to 8th gear when in full auto mode ?
I know this is maybe a stretch but is linked somewhat to what improve has already done
Thanks for reading my long winded story, i hope for possible feedback.