If you plan to run a turbo/supercharger, or if you are using a stock plenum, then it would be wise to use MAP (Manifold Absolute Pressure) for primary load (in the Injection Driver settings as before), and as a result, it is important to install and calibrate a MAP sensor.


For naturally aspirated setups, such as throttle bodies, you may wish to use throttle for load (a system called ‘Alpha-N’ fuelling) and as a result you may not want to even install a MAP sensor. In this case, it is important to set the MAP HRT to always read 100KPa - as shown in the above image, by setting the entire tables ‘MAP’ column to 100. This means the fuelling algorithm will not be affected by MAP readings.


If you’re using a MAP sensor, then it should be calibrated. Most MAP sensors include a data sheet, that illustrate their voltage output based on the pressure they are exposed to. Below is an excerpt from a MAP sensors datasheet from the web - note these numbers will vary depending on the sensor, and that they usually specify the pressures in ABSOLUTE terms, that is, 0KPa being a perfect vacuum, approx 100KPa being atmospheric air pressure at seal level (or 1 Bar), 200Kpa representing 1 Bar of Boost (i.e 1 Bar above atmospheric), and so on.


The 3-Bar (up to 300KPa) MAP sensor we supply has the following pinout, and its HRT table is also shown below.