Quote Originally Posted by beav View Post
The "slip" that everyone is referring to is the 625 rpm minimum difference between engine speed and tranny input shaft speed that must be achieved before the T/C can lock. It appeared that no matter what you did to your tune, until you achieved this "slip" (~625 rpm) you would not be able to lock. It wasn't until the gracious OP and others that he acknowledged broke into the low-level code and found the info needed to override (or change) this slip limit.

Soon, we will be able to make that value reasonably whatever we want it to be. Hope that makes sense and if I have stated this incorrectly, someone feel free to correct me.



You have it backwards. The slip limit is a delta between input and turbine speed, yes. But not as an enable. It's a disable feature that when the slip threshold is above 600 RPM it inhibits TCC apply. This is to prevent excessive wear to the lockup clutch friction material and eventual TCC failure. Since most people switch to a triple disc TC when they add hp this feature isn't as necessary. Raising the slip delta to 1000 RPM or even higher allows the TCM to apply the TCC with no regard for the actual clutch friction material or heat generated by applying it with a large delta rpm.