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Contents TECH BACKGROUND    6  CHAPTER 1: Understanding Engine Management Getting a handle on how the various engine systems work 14  CHAPTER 2: Advanced Engine Management Going beyond spark and fuel – other ECU functions 20  CHAPTER 3: Other Electronic Systems A quick rundown on the other electronically-controlled systems in a car Understanding Engine Management Systems – p.6 26  CHAPTER 4: Modifying Car Electronic Systems Modifying your car’s electronic systems is not as difficult or expensive as you might think 30  CHAPTER 5: DIY Electronic Modification Using a multimeter and finding the right wires 36  CHAPTER 6: Building Electronic Project Kits You only need a few basic skills to successfully build electronic circuits 40  CHAPTER 7: Using A Multimeter Advanced Engine Management – p.14 You can’t make do without a multimeter – here’s how to measure voltage, current and resistance INSTRUMENTS 42  CHAPTER 8: Smart Mixture Meter Track your car’s fuel mixtures in real time, see the operating modes of the ECU and be warned if a high-load “lean-out” occurs 50  CHAPTER 9: Injector Duty Cycle Meter Digitally monitor fuel injector duty cycles or use it to switch devices on and off at different engine loads 58  CHAPTER 10: High Temperature Digital Thermometer It uses an LCD or LED readout, can measure to an incredible 1200°C and can switch devices on or off at a preset temperature Smart Mixture Meter – p.42 SWITCHES AND TIMERS 66  CHAPTER 11: Versatile Auto Timer A multipurpose adjustable timer with lots of uses and external triggering 72  CHAPTER 12: Simple Voltage Switch Switch devices on and off using the sensors already under the bonnet – lots of uses from water-spray and fan control to nitrous oxide switching 77  CHAPTER 13: Temperature Switch A cheap general-purpose adjustable design that can work all the way up to 245°C 4 PERFORMANCE ELECTRONICS FOR CARS Fuel Injector Duty Cycle Meter – p.50 siliconchip.com.au   82  CHAPTER 14: Frequency Switch This cheap adjustable design lets you switch devices on and off according to speed   86  CHAPTER 15: Delta Throttle Timer LCD Hand Controller – p.105 A really tricky way of turning devices on and off, based on how enthusiastically you’re driving MODIFIERS & CONTROLLERS   92  CHAPTER 16: Digital Pulse Adjuster Speedo Corrector – p.129 Take control of the pulsed solenoids in your car – use it to reduce turbo boost, change power steering assistance or control an extra fuel injector 105  CHAPTER 17: LCD Hand Controller Use this plug-in controller to program the Digital Pulse Adjuster, Digital Fuel Adjuster and Independent Electronic Boost Controller circuits 108  CHAPTER 18: Peak-Hold Injector Adaptor Does your car have peak-hold fuel injectors? – if so, you need this simple adaptor to use the Duty Cycle Meter, Digital Pulse Adjuster or Independent Electronic Boost Controller 112  CHAPTER 19: Digital Fuel Adjuster A brilliant voltage interceptor that can be used to adjust air/fuel ratios, allow air-flow meter or injector swaps and even change closed-loop running characteristics 129  CHAPTER 20: Speedo Corrector Swapped out the transmission or altered the diff ratio? – this project will get your electronic speedo reading accurately again 134  CHAPTER 21: Independent Electronic Boost Controller Imagine being able to change between two turbo boost maps at the flick of a switch – this project lets you do just that 149  CHAPTER 22: Nitrous Fuel Controller Use it to control an extra injector for the nitrous fuel supply or even just to vary pump or fan speeds Turbo Boost Controller – p.134 152  CHAPTER 23: Intelligent Turbo Timer This turbo timer set the engine idle-down time to match how hard you’ve been driving 160  ADDENDUM: Resistor & Capacitor Codes Where To Buy The Kits Kits for every project described in this book are available from Jaycar Electronics stores and dealers all over Australia and New Zealand. See the inside front and outside back covers for further details. siliconchip.com.au Intelligent Turbo Timer – p.154 PERFORMANCE ELECTRONICS FOR CARS 5