put my T4 on my car what sort of boost should i run it at if my t34 was running at 34psi ( so its running safe ) till i get the rest of my bits on and get the car setup....?

As i have just blown another t34 but need the car on the roads for another week till i eather get the head gasket done on my dicovery or put me corrado g60 back on the roads.....

Im asking because i know the t4 flows a lot more air so it will need less psi to flow the same as the t34...

Anyone