[Diy_efi] 4L-80E control

[fuelogic at ihug.com.au]

Hey all,

Just a few notes to give you a heads up on what is involved Eric. I assume the 
4L80 is very similar to the 4L60 that I have played with. Some issues not 
mentioned so far are:

1. The pressure control solenoid needs to be pwm controlled with a current 
ranging from about 0.2A (high pressure, WOT) up to around 1A (low pressure, 
cruising). If you don't run this solenoid, you will get some pretty violent 
part throttle shifting. I suspect pwm duty is indexed form the tps, with some 
correction for the oil temperature.

2. You will need to pwm control the tcc pressure control solenoid. Simply 
switching the tcc apply solenoid won't engage the tcc unless the tcc pressure 
control is seeing current as well

3. There is a 3-2 kickdown feel (i think) solenoid that should preferably be 
run. I am not an expert on this solnoid, but from what I have seen the duty 
increases on a 3-2 shift

4. I got best results using shift speed v tps tables for the shifts 1-2, 2-3 
and 3-4. You should probably add a lot of hysteresis on the shift curves to 
prevent hunting.

Just my
thoughts...Matt




_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi