How to make converter lock up firm instead of PWM?
03-19-2005, 12:15 PM
#1
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How to make converter lock up firm instead of PWM? Another member asked this and was told by another know-all member to use search. Well, I did and there is no result for that search.
Does anyone know how to make the converter lock up firm instead of soft?
Ryan
Does anyone know how to make the converter lock up firm instead of soft?
Ryan
03-19-2005, 12:41 PM
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Try adding to the Force Motor Current table. I just tuned an A4 with a 4k stall that was shifting to hard, I used the tables from a 98 to soften the shifts a bit so by doing the opposite you should be able to acheive the desired effect. I would start by adding small percentages until you get it feeling the way you like
03-19-2005, 01:42 PM
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Here's the deal. The converter PWM hangs off the main
PWM line, which is already bled down from the hard
regulator pressure.
At light throttle the PCM on my car commands 0% line
pressure. The force motor table translates "0%" to a
baseline current. More current means the PWM "gate
valve" is more open and the left-over pressure, which
is what the trans guts have to work with, is less. You
can reduce the current in the force motor table and
increase the minimum pressure. So far I've never seen
any tool that gives you direct access to the line%-
vs-load mapping, which is really what's desirable
Two params for the TCC PWM; a base and an offset
(HPTuners nomenclature). I had this explained to me
once by Ken at HPTuners. It seems kind of backwards.
In the stock tune you have 96-98% base and a sliding
offset 0-21 w/ temp. The action is something like,
((base-offset)-muck_with_for_slip)+offset
So jacking up the offset to 98% should put you to full
TCC pass-through pressure, still subject to the main
line's messing-around.
The TCC PWM is right-side-up (more % = more pressure
to the clutch).
Anyway I believe low line% is the root of all (or most) evil
as far as part throttle TCC slip goes. 98% of diddly-squat
is squat, more or less.
PWM line, which is already bled down from the hard
regulator pressure.
At light throttle the PCM on my car commands 0% line
pressure. The force motor table translates "0%" to a
baseline current. More current means the PWM "gate
valve" is more open and the left-over pressure, which
is what the trans guts have to work with, is less. You
can reduce the current in the force motor table and
increase the minimum pressure. So far I've never seen
any tool that gives you direct access to the line%-
vs-load mapping, which is really what's desirable
Two params for the TCC PWM; a base and an offset
(HPTuners nomenclature). I had this explained to me
once by Ken at HPTuners. It seems kind of backwards.
In the stock tune you have 96-98% base and a sliding
offset 0-21 w/ temp. The action is something like,
((base-offset)-muck_with_for_slip)+offset
So jacking up the offset to 98% should put you to full
TCC pass-through pressure, still subject to the main
line's messing-around.
The TCC PWM is right-side-up (more % = more pressure
to the clutch).
Anyway I believe low line% is the root of all (or most) evil
as far as part throttle TCC slip goes. 98% of diddly-squat
is squat, more or less.
Last edited by jimmyblue; 03-20-2005 at 09:13 AM.
03-19-2005, 03:06 PM
#6
Originally Posted by RyanA
Another member asked this and was told by another know-all member to use search. Well, I did and there is no result for that search.
Does anyone know how to make the converter lock up firm instead of soft?
Ryan
Does anyone know how to make the converter lock up firm instead of soft?
Ryan
Bill
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03-26-2005, 01:21 AM
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I used to work at a place that modified harnesses for gm's. We'd get pwm trannies behind non pwm pcm's quite often. We'd just connect the two leads heading to the trans and give it 100% lockup when commanded on. I don't have pinouts for the trans, you'll have to get those. Hope this is what you're looking for.
