I highly suggest you purchase Corky Bell's book Maximum Boost to learn about turbocharger systems. If you're on a budget check out;
http://www.howstuffworks.com/turbo.htm
As far as the EFI question goes, yes the ECU does learn, but in a somewhat limited way. The most common way folks take care of the fuel issue is to use a rising rate fuel pressure regulator (RRFPR). The RRFPR basically increases the fuel pressure in proportion to the boost pressure. Basically by increasing the fuel pressure the cc's of the injector is increased under boost. It'll require a decent A/F and EGT gauge to get everything tuned right.
Aaron I
http://www.howstuffworks.com/turbo.htm
As far as the EFI question goes, yes the ECU does learn, but in a somewhat limited way. The most common way folks take care of the fuel issue is to use a rising rate fuel pressure regulator (RRFPR). The RRFPR basically increases the fuel pressure in proportion to the boost pressure. Basically by increasing the fuel pressure the cc's of the injector is increased under boost. It'll require a decent A/F and EGT gauge to get everything tuned right.
Aaron I