Help w/ strange TC/Shift issue with Fuel Sipper tune

[soutthpaw]

Originally Posted by cleatus12r

As far as any opinions go on this....

I got it to act up in my truck.

It shifted fine and correctly up until 4th gear and would hold 38-40 MPH all day and not have an issue. Once the speedometer hit 37, the torque converter would unlock and then start it's lock/unlock sequence.

Returning the 3-4 and 4-3 shift tables to normal (stock settings) gets rid of all issues with the shift....and it still shifts rediculously early. The thing to keep in mind is that the tune makes the accelerator pedal far more responsive than stock so the TP a/d is going to be lower for any road speed anyway so the transmission will shift earlier than stock all things considered.

For all intents and purposes, correcting for tire size and leaving the 3-4 and 4-3 shift parameters the same as stock would probably work just fine. Between us, another well-known tuner doesn't change the shift points at all for his "economy" tunes. The stock settings with a more sensitive APP makes the transmission shift early too.

Thanks for your work and incite on this.. I sent you an email too. After I saw where it was shifting I wondered about the anticipated shift setting that starts at 1500RPM. Also even with the tire size corrected it still takes more torque to turn the larger diameter tires regardless of the speed. So it was not the Torque reduction issue right as the low throttle position wouldn't put excessive torque to the tranny in the first place...
Ok looked at the difference in upshift and its about 6mph difference.. I could just shift the lower half to stock and let the second half of the throttle from 512 to 1023 slide back to the lower shift points and see how that does...
Did you end up removing or changing the TC lockup or relock delay?

[cleatus12r]

DJ,

You have mail.

[soutthpaw]

Guess what? I and now got the shortcut keys down for copying and pasting along with changing the views etc....
I ordered a bluetooth keypad on ebay last week so I will start to play with the 3D maps once I get that...
I did chat with Bill a bit about using the 3D maps but really haven't got a good understanding of them yet... The 3rd value is throwing me off. usually the X and Y are not labeled as to what they are and sometimes i can tell as its obvious but other times I am not sure what one of the 3 value are referring to. I usually make sense of 2 of them... X and Z most of the time but the Y value throw me....
Anyway I started modifing my shift strategies while the kids were playing at the Y today

Got your email... Thanks, will look at it shortly and overlay it on the new shift values I did this morning and see how it compares