Tuning an Engine
This is best done using an engine or chassis dyno. It is not good practice to try and tune an engine while driving on the road. This would be dangerous to yourself and others.
Tuning Fuel and Ignition Maps
You can tune an engine by using the built-in MAP sensor, a Throttle position sensor or one of the Analog inputs as a primary load source. The tuning processes for each method will be the same.
Using the internal MAP sensor to read engine load
The internal Manifold Absolute Pressure sensor is a 5 bar sensor that can read pressures from –100 Kpa (full vacuum) to 200 Kpa (30 Psi). The tuning grids have a possible 40 user definable R.P.M columns and 21 user definable load rows which give the tuner 3072 individual load points.
The ECU comes with pre-programmed fuel map settings at 500 R.P.M increment. These are only a starting point and can easily be changed.
If this is the first time you have set-up a particular engine you should use the Fuel Trim function in the Trims section of the tuning screen to help get the engine started.
Using a Throttle Position Sensor (TPS) to read engine load
A throttle position sensor can be used to read engine load by detecting the position of the throttle from fully closed to fully open. This is represented as a percentage from 0 to 100 percent. The tuning grids have a possible 40 user definable R.P.M columns and 21 user definable position percentage (load) rows.