If I'm not mistaken, and it has been forty some years since I've bent a 
wrench on the torch so I may well be, the pressurization comes from the 
compressor section and not the turbine section.  In particular, my manual 
for the JT8D says it comes from the 13th stage compressor.  It would be WAY 
the hell too hot to come from the turbine section.  It is hot enough coming 
off the compressor to require an intercooler before using it for 
pressurization.

Jim



> The pressurisation for almost all jets comes form the turbine section.
--- SBBSecho 2.12-Win32