If you are looking for the turbo lessons get yourself parts 8 through 11, here's a list of all of them...
Sport Compact Car Magazine
http://www.sportcompactcarweb.com
Suck, Squish, Bang, Blow:
Aug 99: Part 1 "Killer engine basics from A to Z"
Dec 99: Part 2 "The inner workings of the intake and exhaust system"
Jun 00: Part 3 "Things that go bump in the night"
Sept 00: Part 4 "Secrets of the cylinder head"
Nov 00: Part 5 "Tune to win"
Mar 01: Part 6 "The reciprocating stuff"
Apr 01: Part 7 "Beefing up the bottom end"
Jul 01: Part 8 "Turbochargers the great equilizers"
Aug 01: Part 9 "Turbochargers vs. Superchargers"
Sep 01: Part 10 "Turbo math: picking the right size turbo"
Oct 01: Part 11 "The components of a turbo system"