Converter locking & unlocking
Jan 21, 2009 | 06:39 PM
#12
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Joined: Dec 2006
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From: Enid, OK
:word:
The HD2 kit makes the TCC circuit a simple on/off circuit with the use of a new style valve. The TCC PWM valve is still there and modulate its little heart out but it never has any effect on the TCC circuit line pressure like it did stock. IMO that should eliminate the need for any TCC PWM table changes unless I missed something.
The HD2 kit makes the TCC circuit a simple on/off circuit with the use of a new style valve. The TCC PWM valve is still there and modulate its little heart out but it never has any effect on the TCC circuit line pressure like it did stock. IMO that should eliminate the need for any TCC PWM table changes unless I missed something.
Jan 21, 2009 | 07:48 PM
#13
i've got a built trans with hd2 and mine does this all the time
we set the min/max tables to 90/100 and it helps but sometimes it just wont lock and cycles and it seems to be when the weather is hotter?? we also messed with the force motor current table to add pressure to get it to lock...
we set the min/max tables to 90/100 and it helps but sometimes it just wont lock and cycles and it seems to be when the weather is hotter?? we also messed with the force motor current table to add pressure to get it to lock...
May 17, 2010 | 08:11 PM
#14
I'd like to hear your results. This is the thread that I was looking for when I posted in the tuning section.
Well, I tested it today and it is a fix. Now I am cruising at a higher enough TPS position that it stays locked.
Originally Posted by MikeGyver
I've been having this same problem. I don't know when it started or what I did to cause it. I thought it might be the converter going bad, so I started logging TCC mode, PWM duty cycle, slip %, and slip RPM. Logging shows that the computer is unlocking the torque converter, so after some searching I made some changes similar to Atomic's. The only thing that made any improvement was to set the 0% throttle 4th gear release speed to the same figure as in the 6.25% column, the same as in the first table in Atomic's post #11. It is still unlocking at 55 and 65 mph, those are just the speeds I picked to test. I did notice that it always occurs at 2% throttle, regardless of speed. Therefore, I think that the next thing that I try will be to lower the throttle cracker table in the kPa range and rpm that the highway cruise speed is at, forcing me to hold the throttle open a little more to maintain speed.
Any thoughts?
Any thoughts?
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