TCC Modes?

[joecar]

In your log I see that when the TCC locks, TFT remains stable at 217°F... everywhere else it is increasing...

I'd say that the TCC not locking is causing TFT to run high... but a large cooler like you have should be taking care of it...

how is your cooler plumbed...?

[DrX]

I have redone the segment swap several times.

There definitely is some nonsense in the TSTATE data.

The temp still climbed another 5* during the 8 minute stretch where Locked and 0 slip were reported.

The cooler lines(-6 AN Teflon) are run directly to the Tru Cool.

[DrX]

I never got a trans hot warning with the previous 80E, but the direct clutches gave up after less than 1000 miles and the paint on the front of the converter was cooked. In that trans the pressure was under PCM control. The new one also has a T-brake.

[DrX]

Something is keeping the PCM from locking the TCC all the way (keeping it at AppEn).

Something is causing the fluid to overheat.

AppEn is a 4L60E term... but it seems you're using a 4L80E segment... (see what I mentioned about compatible above).


sanity check:
- is your cooler mounted in airflow...? stock cooler location
- is it mounted with inlet/outlet at top or side (to avoid trapping air)...? bottom as per instructions
- did you verify fluid flowing thru the cooler (about 2 quarts in 20-30 seconds)...? it was at least that much
- are you seeing misfires...? no see TSTATE data
- is the TCC brake switch steady in the OFF position...? yes see TSTATE data
- do you detect any problem with the converter does it seem too loose or too tight...? the converter that came with the trans was too loose (along with these other issues)and was sent back to check out. I have a different brand converter installed now, but have not tested its performance yet other than the tame test drive posted here. Same heat with both converters.

Seems that I may need to run a 60E tune with relay mod.

[joecar]

I never got a trans hot warning with the previous 80E, but the direct clutches gave up after less than 1000 miles and the paint on the front of the converter was cooked. In that trans the pressure was under PCM control. The new one also has a T-brake.

Converter that shows signs of overheating usually means an internal converter problem.

[DrX]

Converter that shows signs of overheating usually means an internal converter problem.

But could it have been caused by the tune? It happened twice with that converter and I have never locked the TCC at WOT.

[joecar]

But could it have been caused by the tune? It happened twice with that converter and I have never locked the TCC at WOT.

That is a hard question to answer...

if you can, try what you said, try the 4L60E segment with the harness mod and run the TCC from the 4L60E TCC ON/OFF signal.


Where did your tune file start from, and what has been done to it...?

[DrX]

That is a hard question to answer...

if you can, try what you said, try the 4L60E segment with the harness mod and run the TCC from the 4L60E TCC ON/OFF signal.


Where did your tune file start from, and what has been done to it...?

Stock tune > COS3 > 80E segment swap
It is an SD tune that is scaled 50%

[joecar]

I'm thinking you should have gone:

stock tune -> 4L80E segment swap -> COS3

you could still do that and copy in your scaled tables.

[DrX]

I'm thinking you should have gone:

stock tune -> 4L80E segment swap -> COS3

I was wondering if that could be an issue as well.