Taz has a good point... if VE table is close then trans line pressure will be closer to matching engine torque.
Taz has a good point... if VE table is close then trans line pressure will be closer to matching engine torque.
^^ Read above^^ He said set table to! Not add to!
"Slowly gotten worse" is a sign the adaptive learn is working against the shift kit. When you added .2 you made it worse for learn.
Although this thread was for 4L60E I think a lot of it will help understand, it did to me when I started it. Also look at first post! I linked all really good threads on transmission tuning.
HTH!
Forgot to add the link and having issues with "Edit Post" so here's the link:
http://forum.efilive.com/showthread....ock-3rd-at-WOT
How do you disable the Low pressure adjust, zero out all the values?
Yes.
Try the attached tune ... use caution. Without knowing how much the fluid flow / pressure was increased mechanically by the shift kit, I am merely guessing at a starting point. The attached tune could end up being extremely harsh and unusable, or fairly close for drag strip use.
I also put some torque reduction back in, just to be safe.
This tune is intended as a starting point for developing desired shift firmness. It will not hold first gear if manually selected (no stock 4L80 tune will) - I charge a fee for that service - if that is something that you may need down the road, just send me a PM.
Thank you for all of your help but it looks like the pressure control solenoid is bad. I have one on the way, I'll let you guys know as soon as I get it back running.
At the risk of coming across like a dummy (yeah, I've been called that) I have forgotten much more that I probably will learn since I've kinda parked my van,
I'm assuming that it doesn't really hurt the tranny to add in lots of base pressure (D0701,D0702, D0703)? Mine seems to me to shift really soft, even with disabling torque reduction, and zeroing out the desired shift times.
Wolfie
LS1B 2007 Express 6.0 /w 470,000+ miles (parked as of 01April2011)
Hi Wolfie ... I can email you one to try if you want ... the one I posted in this thread is far too harsh for a daily driver to use !
To answer your question, you can add quite a lot of pressure to the 3>4, a fair amount of pressure to the 2>3 shift, and a cautious amount of pressure to the 1>2 shift.
With a vehicle like yours, with an active Tow/Haul switch - two separate profiles can be developed. One for daily driving, and the other for towing, drag strip, etc.
Cheers,
Taz