help with tranny tuning for $EE

[jrgcjnl]

As I was working on my current tune's line pressures and shift times, I noticed that on there isn't a line pressure modifier for 1st gear, and that on the offsets they don't include 1st gear
why is that? can one be made up or am i stuck?

[jrgcjnl]

the only reason im asking is because i want to have a certain pressure in normal mode but in performance mode i would like the tires to break loose, thanks in advance guys!

[Fuzzy from MN1988]

I'm kind of in the same place, there's a couple people on Impala SS Forum as well wondering about tranny tuning.

[jrgcjnl]

also i was wondering, if i post up my tune could anyone review it and tell me if anything is wrong with it? my mods are in my sig

[jrgcjnl]

...anyone?

[EagleMark]

Sorry I've been gone for a week.

You can post your bin, I have JET DST software to take a look at the 96 OBDII file.

Playing with line pressures can result in some bad results! There's just way to many factors to take into consideration. What I found to be perfect easy way to tune a 4L60E was start with a caddy V4P towing package bin, use every table for tranny with compare and change them all!!! Or just use the bin in a 94-95 to start, not sure that would work in a 96?

Then look at performance shift times and IIRC they are all 0 while normal has varied times. I copied all performance shift time into normal shift time tables. This was all I needed to have a good performance shift MPH, firmer shifts and felt more like a performance car or truck if you will. Also lowered my tranny temps by 10-15 degrees! You can actually feel shifts and drives very nice instead of the one big slush...

Now if you like the one big slush and want to change to performance when needed there is a writeup here I copied from somewhere giving them credit of course on how to wire in the performance shift button that came on only one car IIRC a Trans AM? But I found no need as I would have just done all that work of wiring in a button just to leave it on always?

I've been told that if you have a shift kit installed in tranny this will result in way to hard a shift... HTH!

As I get my LT1 engine into new unwrecked car I do want to play and learn some more on this. One thing I did learn earlier when I was doing above is trying to change shift MPH times is also a very complicated procedure as so many factors, what happened was on highway my tranny was shifting 4,3,4,3,4,3,4,3 as I did a datalog and did not notice it happening as it was so smooth till tranny over temp light came on! So where I left off and was happy with was the Caddy V4P Towing bin, shift times 0. Poof! Nice!

So great care is needed when making a change to one table as so many other tables are effected. When you make a change or experiment use the data log for tranny to read back what is happening and watch tranny temps.

On a wet day from a rolling 20 MPH start I would get kickdown to first and a little tire spin, when shifted to 2nd tires would break loose and instant RPM redline!