I'm only 25 pages into this book (arrived yesterday) but I *know* I will be referring to it often. The author starts from the ground up and explains principles and dispels myths about turbos in a very bite-sized, easy to digest way. There's some maths but it's not overly complex and his point by point approach means you can read a bit and let it digest, then come back for more when you're ready.
The whole writing is very factual rather than opinion-based and he uses facts, figures and real world examples to explain his points. He also covers the same points from different perspectives - e.g. someone looking to buy a turbo car, someone modifying an existing system or someone building & installing a system from scratch.
I'm currently doing a turbo conversion and this has already proved to be an invaluable resource.
Highly recommended.