I’ve read all of these and found them to be excellent.

• Auto Fundamentals: How and Why of the Design, Construction, and Operation of Automobiles – “One of the most popular automotive theory texts available, Auto Fundamentals provides a study of the design, construction, and operation of all major automotive systems. Content centers around the theory of automotive operation–how and why systems interact.”
• Forced Induction Performance Tuning A Practical Guide to Supercharging and Turbocharging – A must read. Excellent.
• How to Tune and Modify Engine Management Systems (Motorbooks Workshop) – The single best book on the topic so far. You’ll read it more than once.
• Street Turbocharging: Design, Fabrication, Installation, and Tuning of High-Performance Street Turbocharger Systems. I was surprised by how good this smallish paperback was. Excellent.
• Internal Combustion Engine Fundamentals. Also known as simply as “The Heywood Book” which should tell you something about its longevity.
• The High-Speed Internal-Combustion Engine – “This authoritative book by one of the pioneers of I.C. engine development was last published in 1968, and included work on fuels and developments in mechanical design, in addition to the well-established chapters on diesel and gasoline combustion, and components. After being out of print for over 30 years, this classic text has now been reprinted by the company Sir Harry Ricardo founded, making his work available to a new generation of engineers.”