2008 Pontiac G8 tcm tuning

[roughneck427]

Ok im trying to get my WOT shifts firm and read hptuners website till my eyes bled. Anyone here mess with the 6l80e using Tunercats or Efilive I raised my wot rpmthats fine and I lowered the 1-2 2-3 3-4 shift times down. A lot of different tables compares to a 4l60 file which I have no issues getting to shift hard at WOT.

[MYLTWON]

Did you try slightly raising the pressures? Usually between those 2 it firms everything up rather nicely.

[Buzz]

Missed reading this post somehow ... post your tune ... have done a few of these.

[Buzz]

Forgot to add .... you can post the calibration as a *.tun, *.cal, or *.bin ... can work with any of those formats.

[Buzz]

Did you ever get the G8 shifting to your satisfaction ?

[roughneck427]

This is the file i messed with i went on the G8 forums and have a tcm file it will bark 2nd gear but im not to happy with the shifting its erractic never the same as far as part throttle driving and when i stomp it has a delay on downshift. Seems my file im posting here has no delay on a downshift but cant get any firmness out of it.

I had John even add some tq managment tables to the vdf but havent messed with them yet i know hp tuners has them

[Buzz]

Can you also post your original (non-modified) TCM cal, and the one from the G8 Forum that was only a partial success ?

[Buzz]

Post your ECM tune also if you want ... I have added the Calculated Torque Output tables (EFILive dubbed it the "Torque Model") to my TC software, for some E38 calibrations that I use often ... would give me an excuse to add these tables to the G8 E38 ... then we could also use this as a tool for fine tuning the adjusted shift firmness.

[roughneck427]

mod2 is the g8 forum file the other is stock

[roughneck427]

when cold the car runs hard when warmed up seems like it slows down


with plugged air cleaner did 287 rwhp bone stock haven taken back to dyno yet with mods and tune

[Buzz]

Does the "slows down" phenomena feel like the engine laying down, or the transmission shifting lazy ?

[roughneck427]

its a combination of both more throttle to go and trans shifts a lot softer I know fluid is not warmed but it is a def big difference

[Buzz]

Roger ... lets try one thing at a time. TCM tuning initially, followed by ECM Calculated Torque Output tuning.

I have to add some parameters to the TC software for your cals ... between that and the myriad of tables in the T43 TCM ... may be a week before I have something for you to try ... after that point, the back and forth changes should be quickly done.

[roughneck427]

no prob its my DD I gotta weld a wb bung in still and delete my mid muffler and put in x pipe before heading back to dyno I will say its def a lot faster than stock just needs some fine tuning I like an A4 a lot better right now until I understand the the T43 deal its a temperamental thing

[Buzz]

OK ... try the attached T43 cal. It is by no means to be considered a finished product - you can spend days tuning these controllers.

I primarily focused on the sequential upshifts - everyone likes to accelerate !

Please be cautious ... if anything seems to be wrong, stop.

It will take a few drive cycles for the adapts to learn the updated programming.