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3. Programming the Stag-200, Stag-300 controllers
There are two ways to program the Stag-200 and Stag-300 controllers:

Programming with the gasoline and LPG maps. See 3.1 to 3.4

Manual programming of the controller. See 0
Programming with the gasoline and LPG maps consists of the following stages:

Auto-calibration of the Stag-200, Stag-300 controller

Collection of the gasoline injection times with gasoline (gasoline map)

Collection of the gasoline injection times with LPG (LPG map)

Making sure both maps match and checking deviations

3.1. Auto-calibration
Prior to starting the auto-calibration, start the engine and wait until the lambda probe begins to work. During the auto-calibration the engine should work at idle run; do not increase rpm, switch off air-conditioning and lights and do not turn the steering wheel as this may cause errors during the auto-calibration. During the auto-calibration, watch carefully gasoline and LPG injection times. If LPG injection times are shorter than gasoline injection times, the injector nozzles may be too large and should be replaced with smaller diameter ones. When the auto-calibration is complete, 2 extreme yellow points and 4 additional points in between will show up on the multiplier map. The second left point is the point of engine operation at idle run i.e. the point of operation during auto-calibration. The multiplier’s value for this point should be between 1.1 and 1.6; if the value is greater than 1.6, longer times of gasoline injection i.e. greater load and high rpm, may cause overlapping of injection times i.e. one LPG injection will begin before the previous one ends (looped injections). In such a case, the controller will display the „Injection time too
long” error message. However, in such a case, check the operation of the lambda probe; if it is in the “rich” mode and the vehicle drives without problems, the error can be ignored.

3.2. Collection of the gasoline injection map with gasoline (gasoline map)
Having finished the auto-calibration, switch over to gasoline and drive the vehicle for app. 4 km to collect the gasoline map. During the collection of the map try to drive without changing gears e.g. at the 4th gear and in a way making the lambda probe to “work” i.e. changing its mode from weak to rich. Blue points should appear during the collection of the map. To collect the map quicker, adjust vehicle load in such a way causing new points to be collected in places which are still empty. Collection of maps is performed without participation of the diagnostic software, thus can be done with the PC disconnected.
However, collecting the map while the PC is connected and the diagnostic software running is quicker and enables the operator to see what is actually happening to the vehicle. When the controller collects sufficient number of points, the map will be drawn with a continuous line and the gasoline map collection is finished.

3.3. Collection of the gasoline injection map with LPG (LPG map)
Having collected the gasoline map, switch to LPG and collect the LPG map in the same
way the gasoline map was collected. The LPG map should be collected in the same road conditions and with similar loads as the gasoline map. The LPG map is drawn with green points. Having collected sufficient number of green points, the map will be drawn with a continuous green line. If the controller is set properly (the multiplier characteristics selected properly), the gasoline and the LPG maps should match. If the maps do not match, the multiplier characteristic should be corrected at the points where the maps do not match (the lower axis of co-ordinates for injection times). If the LPG map is collected with the PC connected and the diagnostic software running, it is possible to immediately correct the multiplier characteristics when the collected green points do not match with the gasoline map. It is even strongly recommended to use the PC in this way as if the multiplier characteristics differ strongly from the required ones, the controller starts to switch over and – in the extreme case – can activate the “check” signal lamp. When correcting the multiplier characteristics, make the points on the LPG map match with the gasoline map.
Once both maps match, the characteristics are properly set.
3.4. Checking if maps match, verification of deviations
Having collected the gasoline and LPG maps (both maps drawn with continuous lines)
check the deviation between them. In the Map window there is the “Deviation” button
located on the right. Press it to see the deviation graph drawn with a red line. If the
deviation fits within ± 10%, the controller is programmed properly; otherwise, the
multiplier characteristics should be corrected at points where maps do not match.

3.5. Controller manual setting
The controller may also be set up manually, which – provided sufficient experience has been gained – may prove quicker than the above described procedure.
Start with the auto-calibration in the same way as described above (this is necessary to ensure the controller works properly, see 3.1). If the auto-calibration finishes properly and the multiplier values are correct for the calibration point, switch the engine to gasoline and take it for a ride. The multiplier characteristics need to be set in the following way:
Drive the car with a constant load, i.e. the gasoline injection times should be stable. Adjust the engine loads so that the injection times equal e.g. app. 5 [ms]. The blue marker will help determine the injection times as it is location on the horizontal axis is determined by the injection times. Next, switch the car to LPG and watch the blue marker for variations in injection times when compared with the earlier gasoline injection times. If the injection times decreased (the marker moved to the left) it means that for the selected injection times the multiplier is too high (the mixture is too rich). In this case, lower the multiplier value for the 5 [ms] injection time (in our case). If upon switching to LPG the blue marker moves to the right, it means the mixture is not reach enough and the multiplier needs to be brought up for given injection times.
The procedure described above should be performed for a few different injection times, starting at the calibration point all the way until heavy load injections. You can check the multiplier map e.g. every 2 [ms] starting at the calibration point. If necessary, add a point at the multiplier map to set it more precisely.
Once the manual setting is complete, both maps – gasoline and LPG – should match.

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