Performance Fuel Injection Systems Hp1557: How to Design, Build, Modify, and Tune Efi and ECU Systems.Covers Components, Se Nsors, Fuel and Ignition RA practical guide to modifying and tuning modern electronic fuel injection (EFI) systems, including engine control units (ECUs). The book starts out with plenty of foundational topics on wiring, fuel systems, sensors, different types of ignition systems, and other topics to help ensure the reader understands how EFI Systems work. Next the book builds on that foundation, helping the reader to understand the different options available: Re tuning