Well what we're talking about here from MV is what Zoom magazine put in their 33 4door RB26DETT Auto project '11s'
issue 82
MV Auto
"Its not so much the electronic bits in the gearbox control computer, but rather the hydraulic programming circuits that exist in the valve body. The small channels and restrictors in the valve body allow long, drawn out shift times and the sort of slurry full-throttle up-shifts that can make short work of internal clutch packs."
Zoom goes on to say that the gearbox now had alot more bite, and 1st-2nd gearchanges at full throttle is enough to spin the wheels (this in an rb25de) with 3-4th also alot stronger.
Standard stall converter for re401 is bout 1800rpm
Check the zoom mag article out if your really interested, it has 7-8 photos explaining the process.