is there a difference? Is locked and engaged two different states in the torque converter in the a4's?



thanks

 

I have never heard the term "engaged" used in the context of a TC. I suppose that you could say that is always "engaged" in that when the impeller is spinning (which is whenever the engine is running) there is always some torque being transmitted to the turbine. However, when the lockup mechanism is engaged, there is a direct mechanical connection (as opposed to hydraulic) between the impeller and the turbine.

Rich Krause

 

well im trying to understand the tcc tables in tunercat, and they use engage and release as the table names, along with the "TCC forced lock speed threshold" table. So the tcc never locks until 95 mph? (in the case of an fbody with a stock tc) according to the stock bin file. The torque converter confuses me. My overall goal here it to figure out how the tc affects performance in relation to rear end gears. i went from 2.73 to 3.73 and driveability is fine using the stock tcc tables. However, i noticed the stock tables from my stock 94 z with 2.73's differ from a stock 94 TA with 3.23's. Obviously gm changed the settings for a reason relating to gear ratio but ive yet to figure out why and if i should change my values to accomodate my 3.73 gears.

Any ideas?

 

I don't know much about electronically controlled automatics. But it sounds like the term "engage" is used to mean "lockup" in this context. Again, I am just guessing, but "forced lock" sounds like it is referring to a speed where the TC will always lockup, not a minimum speed needed for lockup.

Hopefully, someone who know TC will chime in. You might want to post this over in the "Competer" section.

Rich Krause