Been doing a lot of Atapping this week & found that the converter has a tendancy to unlock MUCH more often when the PCM is storing a "pending Code",even if this code has NOTHING to do woth converter lock-up (ie; higher than expected idle)You would never know these pending codes are there w/o some kind of scan tool (Atap,etc) because they don't throw the SES light.As soon as I would clear these various codes,BAM the converter would lock.So if your suddenly having lock-up problems,here's yet one more place to look.
The other issue is that apparently our trannys DO NOT shift at full pressure @ WOT.We tracked the pressure control solenoid current on 3 bolt-on cars w/o ported maf ends.The results were all about the same.All of them shifted at .45 - .60 Amps @ WOT.Minimum pressure is 1.0 Amps & full pressure is .1 amps,which means all of them were shifting at 135- 155 PSI instead of 190 PSI which is full pressure.I proved this by re-installing my old B&M Shift plus that I took out years ago when I heard how much damage they cause,& the amp reading went to .00 - .01 AMPs & the tranny shifted much harder.
Just thought I would share my findings.Comments & opinions welcomed.

 

thats pretty interesting to hear. i too find that the converter doesnt lock up well when i have codes (mostle the annoyign shift solenoid problem).

i wonder why it doesnt shift at full line pressure at WOT?

maybe it has something to do with torque management?

 

I'll betchya it does have to do with torque management.

I know Trevor D's had T/M removed and a shift kit added, so it might be interesting to see what his current readings look like. Maybe 0 amps is not such a good thing.

 

Rich3fan is one of the 3 cars I'm talking about.Thanks for the time you took to log these parameters,Rich.
I can't help but think that .01 Amps (full pressure) is anything but good at WOT.The car consistantly shifts 100-150 RPM's lower when it's at full pressure,which leads me to believe that it's slipping those 100-150 RPMs w/o full pressure.To me,slipping can't be good for the clutches & bands.Now running around all the time even at part throttle at .1 AMPs (full pressure) probably isn't good either.That's probably why the B&M unit was so bad for our trannys,it's full pressure all the time.

The only way I see to cure this is to have a switch wired to give the tranny full pressure at WOT.If anyone has any ideas on how to do this,I'd sure like to hear them

 

One more thing.I don't see torque management being the cause.From what I've logged, it's obvious TM pulls ignition timing to try & save the tranny,not line pressure.

 

Interesting. What is the parameter to monitor for the solenoid current? I looked through the DOS v2.10 last week and didn't see it. If it's only in the Win version I'm SOL as my laptop won't run it.

 

Well, if it's in the 2.05 version, I'm sure it's in the .10 as well.

I had the same question, AFTICA pointed out that you have to be connected to the car, key on. The official name is: "Press Cont Act Crrnt". It's in the third column with other tranny stuff. HTH

-Rich

BTW, I didn't know there was a rev 2.10. Is it downloadable from their website? Thanks!

[ February 16, 2002: Message edited by: Rich3fan ]</p>

 

Thanks, Rich. Yes, the v2.10 is on the web site, at least that's where I got it.

 

It would be interesting to test a car with a HPP3. Log some part throttle shift's (with TPS)and some WOT shifts with stock and then repeat with the 25% and 75% setting.

Interesting results.

 

Ragtop - The HPP3 set at 100% changes the solenoid amps by .1 (about 15 PSI) across the board, at part throttle or WOT according to my atap logs.Don't know what 25 or 75 % would do,but it appears the Hpp3 really doesn't make a lot of difference even at 100 %.

 

This is some interesting info. I agree w/ AFTICA that it's most likely not tq. mgt. related. I haven't monitored this particular parameter on ATatp, but I can tell you that my shifts did not firm up any with the deletion of tq. mgt. I'll play with ATap tomorrow and see what kind of reading I get.

 

gwj - I'm pretty sure it's as Rich described. Pressure control active or action current,in the third column over.Make sure your looking at the "show all parameters" screen.Car isn't here right now,otherwise I'd look.

 

Okay guys. I have DOS versions 2.05 and 2.10. Just WHERE are you monitoring solenoid current and/or line pressure??????
There is no "Press Cont Act Crrnt" anywhere I have found. What gives????? And yes, the key is on when I check parameters.