Do not ground any sensor to the engine or chassis. Always ground sensors directly to the loom.
Manifold Absolute Pressure Sensor
The EMS STINGER 4 ECU uses a built-in MAP sensor. This sensor works in absolute pressures, meaning that it does not need calibration for different altitudes. The sensor accurately reads pressures from negative 100 Kpa to positive 200 Kpa (3 Bar). Connect a vacuum/boost hose to a suitable location on the inlet manifold plenum near as possible to the center of the plenum. Do not connect it to any single runner.
Engine Temperature Sensor
Wire Colour: Grey/Blue and Black
The EMS STINGER 4 ECU can use the original engine temp sensor on the engine. You can calibrate the sensor to the ECU. The calibration can also be saved as a file and reused on other EMS ECUs. It is important that the engine temperature readings be reliable and accurate. This information is used to add extra fuel in situations like engine warm-up, cold starting, and post-start enrichment. Engine temperature is also used to compensate the ignition timing.
Inlet Air Temperature Sensor (optional)
Wire Colour: Orange/Black
The air temperature sensor is used to compensate the fuel delivery for changes in air density due to air temperature. The ignition timing can also compensated for varying air temperature. The sensor should be mounted where the air stream is moving fastest. Keep in mind the effects of heat soak and try to mount the sensor in a location where heat soak is minimized such as near the air filter. Small changes in climatic temperatures will have little effect on the tune. In locations where temperature fluctuations are minimal such as countries in the tropics many tuners do not install them.
The EMS STINGER 4 ECU can use the original air temp sensor on the engine. You can calibrate the sensor to the ECU. The calibration can also be saved as a file and reused on other EMS ECUs.
Stinger 4 instruction manual version 2.0