New Autronic pages

Barometric sensor setup

One of the parameters affecting fueling and ignition is barometric pressure. Autronic has several ways to compensate for the altitude changes. Since my Autronic is configured in Speed density mode (MAP), in theory I wouldn't need a baro sensor. But, for example exhaust system and intake system will affect the baro.

Autronic has several baro compensation modes:

1. Without Baro sensor: Without Baro sensor, Baro pressure is read from the MAP sensor when ignition is turned on and engine is not yet running. This value is then used in fueling calculations and is not updated until engine is restarted.

2. With Baro sensor. Separate Baro sensor installed in one of the Analog channels providing REALTIME baro compensation.. I made one into a OEM M3 baro sensor housing, shown below. Sensor has a MPX5100AP pressure sensor and 5-volt regulator. Voltage is then measured by the Autronic.

3. Without Baro sensor, using baro table. This will be how I want to leave it, but requires some work since table has to be mapped for different loads and rpm's. Pressures has to be measured before and after the throttle butterflies.

Since I have now a Baro sensor installed, a hose from the sensor was routed into the airbox to read the pressure before the throttle butterflies.

I can read the manifold pressure directly from the MAP sensor so I wouldn't need any additional sensors.

Several WOT runs are then needed so that table can be generated by Autronic. I'm not going to reveal exactly how it is done since it is Autronic proprietary information.

Table is now being built by Autronic and after I have it, I will post it here.