My assumption was that if the PSD was welded the two motors would run together at the same speed.
I will go back to Damien's early videos and recap.
Thanks for the help.

So my understanding the the MG1 spins faster than MG2 is wrong and for them both to spin at the same speed you would be advised to leave the PSD alone and lock the input shaft and rely on the external oil pump.
I'm wanting to use both motors to there best ability in a project.

If you were to weld the PSD in the L110 as in the prius would this alow MG1 to run at the same speed as the MG2 thereby allowing you to rev MG2 higher without over reving MG1? Also would this then cause the internal oil pump to drive?
Just asking. Cheers

This may be my solution for electrifying a Toyota Hilux Surf gen 3.