Transmission Tuning

[TexasCummins]

Did a highway test today and it feels like it loses power above 45. I'm not recommending y'all use my figures as I still need to fine tune it, but I have a sneaking suspicion my torque converter is slipping.

[TexasCummins]

Update:

I set the governor pressures back to stock (with my personal shaft rpm changes based on my shift points) and adjusted the first half of the TTVA angles +2*. Cured the shuttle shift and drives good while cruising, accelerating and at WOT.

[TexasCummins]

Another update to my last post.

Light acceleration (~1600rpm)
1-2: 15
2-3: 27
3-4: 38
Lockup: 55

Moderate acceleration (~2100rpm)
1-2: 20
2-3: 35
3-4: 45
Lockup: 55

No WOT numbers yet.

[FUBAR]

Here's something to add on to my experience:

I had to revert back to stock TTVA settings to keep from shuttle shifting so much. I however seem to have success with dropping the kickdown mode from 80% to 70%, and full throttle mode from 95% to 85%, and full throttle shift from 3050 RPM to 3100 RPM. The difference I experienced in doing so was it seemed like the transmission was prepared earlier in advance to the power WOT that was about to commence giving a more BAM, right now feeling. Still playing with it...

[jrmega]

Will the EFI diagnose items like a bad governor pressure solenoid? I'm leaning towards the Autocal, and wondering if it gathers data that would indicate such items?
thanks!

[jrmega]

I've read a post that involved checking flow rates of injectors, so I guess it can help diagnose a part (injector, gp solenoid, etc) that's not functioning correctly-therefore in need of replacement.

[FUBAR]

As far as the injector balance rates, it's debatable. Looking at the difference in rates seeing which one is flowing more or less of course. I would still prefer the kill test. And bump for ya on the gov pressure question.

[2007 5.9]

I just helped a guy diag a bad gov pressure...while only using EFI.

So yes it can help.

[flat_lander]

What's the low range setting signify for all of the various trans settings? Initially I was thinking it was when you move the gear selector from D, but if that's the case, how do you accomplish 4th gear low range?

[icemanjc1]

What's the low range setting signify for all of the various trans settings? Initially I was thinking it was when you move the gear selector from D, but if that's the case, how do you accomplish 4th gear low range?

4wd Low........