New 80E and convertier....overheating

[DrX]

Took the new 80E out for a drive and by the time I was back home (about a 20 mile loop on flat terrain, ambient 82*F) I had the Hot Trans message pop up. This 11" converter is supposed to have a stall speed of 2600 RPM or less and the trans is setup for full time 200 PSI.

I did find that the TCC was constantly locking/unlocking in cruise.....it unlocked anytime the TP started to decrease. I could see no way to correct that in the tune which had stock TCC tables, so I replaced the trans segments again and the TCC is behaving normally. I also found that the fan on my trans cooler was not kicking in, so I wired it to run full time.

I did a trans log today and it was still heating up. (see attached)

A few things I noticed in the log:
1. The amount of TC slip at WOT - see around frames 6200 and 9300
2. TC slip even when locked if TP goes over 40% - look around frame 5820.....I had the tune set to release anytime TP hits 60%
3. TIS and TOS are equal in 4th gear with the TCC locked, and TIS is > Engine RPM - see frame 7540.......Could this be correct?

[DrX]

I guess point 3 is explained by the fact that the overdrive section of the trans is at the front of the unit before everything else. My mind keeps wanting to think of overdrive as an end of chain add on.

As for 1 & 2, the converter is heading back to the builder. At some points in the log there was over 2000 RPM slip at high engine RPM with slip actually increasing rather than decreasing.

[Redline Motorsports]

I guess point 3 is explained by the fact that the overdrive section of the trans is at the front of the unit before everything else. My mind keeps wanting to think of overdrive as an end of chain add on.

As for 1 & 2, the converter is heading back to the builder. At some points in the log there was over 2000 RPM slip at high engine RPM with slip actually increasing rather than decreasing.

Is this a new 80 in this vehicle? You have to be careful the the cooler line that goes into the trans doesn't bottom out in the trans.... I've seen it before and it will cause overheating... It's the fitting that screws into the trans.....

Howard

[DrX]

Yes, its a new 80E. I will check that when I pull the trans, thanks. If the fitting is similar to this one, I would think it would have to be too long in order to cause that problem as it has to be fully seated in the case in order to seal the o-ring.

I inserted it into a center support(last 2 pics) and you can see how it can block 1/2 the center lube hole if bottomed out/too long. The hole is not that big to begin with.

[Redline Motorsports]

Ok so at least you understood what I meant!

Ive seen it happen before so just an FYI!

Howard