The nissan skyline (R33 Series 1, 1994 to 1996) has a 2.5L 6 cylinder
turbo engine.

I have just got the turbo off this car and I'm looking for the turbo
compressor flow map for the rb25 turbo.

sorry,  dont have an answer for you.  youre going to have a heck of a
time finding the compressor map for one of these turbos.  theyre not
very popular for making more than stock power, due to their fragile
build materials.  you might be one of the few guys interested in their
specs.

if its any help,  the compressor is called the 45V1.  it is the
smallest of the 45V series.  youre not going to find much information
on this turbo, as it was used for OEM distribution by Nissan, and has
no aftermarket equivilant.  any owner that was interested in power
swapped it out as soon as they could, for reliability sake.

good luck with your question.