Page 4 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Part 3
– Tuning Guide ................................................................................................................. 98
Background ............................................................................................................................. 98
Fuel Tuning General Concepts ............................................................................................ 98
Spark Tuning General Concepts ......................................................................................... 99
Calibration Setup ................................................................................................................... 100
Base Calibrations ............................................................................................................... 100
Timing Pattern Basics ........................................................................................................ 101
Fuel Phasing and Injector Setup ........................................................................................ 104
A more complex example .................................................................................................. 106
Ignition Phasing and Coil Dwell Discussion ....................................................................... 107
Set up RPM and Load axes ............................................................................................... 114
EFI Sensors ........................................................................................................................... 115
TPS (Throttle Position Sensor) .......................................................................................... 115
MAP (Manifold Pressure Sensor) ...................................................................................... 116
Air Temperature Sensor .................................................................................................... 119
Water Temp Sensor ........................................................................................................... 120
O
2
(Oxygen) Sensors ......................................................................................................... 120
Knock Sensor .................................................................................................................... 125
Sensor Calibration ............................................................................................................. 126
Fuel System Setup ................................................................................................................ 134
Fuel Pump Setup ............................................................................................................... 134
Fuel Pump Sizing ............................................................................................................... 135
Fuel Pump Location ........................................................................................................... 136
Fuel Hoses and Routing .................................................................................................... 136
Fuel Delivery Hose Sizes ................................................................................................... 137
Fuel Filter and Fuel Rail ..................................................................................................... 137
Fuel Pressure Regulator and Pulse Dampener ................................................................. 139
Basic Tuning .......................................................................................................................... 142
Timing Pickup Confirmation ............................................................................................... 142
Noise .................................................................................................................................. 145
Ignition Synchronization ..................................................................................................... 146
Crank Fuel & Engine Start ................................................................................................. 148
Idle Air Control ................................................................................................................... 150
