Transmission tuning...

[pavement pounder]

I doug up this old threat just to know if you where able to set the performance mode to 0 on the 16147060 4L80E program.
And how does it shift ?

[EagleMark]

Better be more specific to which parameter. I just looked and see "Performance Mode Upshift/Downshift Vs. MPH Vs. TPS " So no! This is MPH.

The table "Shift Time vs TPS" is in msec so lower here makes the shifts quicker. I've been playing with tranny tuning quite a bit lately and you can zero this table. But when data logging it still takes .200 to shift so it seems this is as low as it needs to be set.

But if this is like newer OBDII systems the "Adaptive Pressure Modifier Vs. Shift Time Error " would also have to be zeroed out or it will just learn out the change. Problem is that table does not look correct at all in the definition?

Pretty cool PCM and we have a good dissasembly, just no one has ever spent any time including more items.

[buddrow]

Dont mean to butt in, but the reason u r seeing lower numbers is due to the Pressure Control Solenoid is PWM controlled and the lower the current/more off time, the higher the line prssure. Resulting in firmer quicker shifts. If u have any questions i may be able to help. I havent tuned any trannies yet, on my list of things to do, but I have 20yrs as a trans tech and now how the inner workings operate.

Anywho, lowering the pulse width to the PCS will make firmer/quicker shifts but take it easy. Too much line pressure can be as bad as not enough, you will break things. Remember u want quick and firm not holy crap I just s

[EagleMark]

Please butt in!

But I'll probably start another thread with some real questions as to how my tuning results are working, or not working, and whats safe pressure stuff etc...

[buddrow]

Ok I'd be happy to help if I can.

[pavement pounder]

Thanks guys,
I will play with it and see what happens.
Please do butt in, all info is more then welcome, don't need to reinvent the wheel again

[buddrow]

You are seeing decsending values because the Pressure Control Solenoid operates an varying current to adjust line pressure. If ur close to 1.0Amp then line pressure is low. The closer you get to 0.1amps the higher line pressure will be. Just be careful and dont go to low as you WILL break things. The pulse width lowers during the shift so as not to "bang" during the shift. Remember, you want quick, firm shifts but NOT harsh shifts. HTH

Bud