PTS trans shift point questions

[AKplumber]

I bought this car with a pts trans with a 3600 911 l/u convertor installed and it has performed flawless with many 10 second runs under its belt. My question is concerning shift points, at 18psi the 1-2 shift is at 5800rpm and the 2-3 is at 6000.

At 21psi the 1-2 is at 6000 and the 2-3 is at 6400. I'm a little concerned that this telling me the trans is begining to lose its holding power. Looking for some input from those in the know before I turn the boost up further.

I'm unsure where the shift points were prior to this year as I just installed the power logger and finaly have some real data to go by

 

[77 cruiser]

Or your getting that much more slippage from the convertor.

 

[mikestertwo]

Or your getting that much more slippage from the convertor.

It's most likely the converter. As torque increases, the stall speed of the converter increases.