STINGER 4 ECUs can read one of many selectable trigger patterns. Each engine provides a trigger pattern that the ECU can use to synchronize itself to the engine cycle. Some engine manufacturers use patterns that are specific to their engines and other manufactures use systems developed by third party companies such as Bosch.
The Ignition Type parameter allows you to select one of many trigger patterns available. This eliminates the need to install external trigger wheels and sensors. EMS is constantly adding more trigger patterns to their ECUs. Because of the number of selectable trigger modes only the most common will be described in this guide.
Normal In this mode the ECU will count the number of teeth that have been set in the Number of Teeth per cam cycle parameter. If there are more teeth than cylinders then a Sync sensor must be used to detect when TDC for cylinder one is approaching or if you need to run sequential ignition. You set the static timing tooth in the Static timing tooth parameter.
Missing Tooth This pattern is found in many European cars as well as General Motors, Ford and Toyota etc. It is important to include the missing teeth when counting the number of teeth. The missing teeth must be consecutive and only one set missing. You must also set the number of teeth after the missing so that the ECU can synchronize to the correct static timing. Missing tooth trigger systems usually run off the crank, so if you want to run full sequential ignition then you must also use a sync sensor on the cam and ensure that the Sync Sensor Used parameter is ticked. If the missing tooth wheel is on the crank then double the number of teeth counted. Note: Missing tooth mode does not work with 3 and 5 cylinder engines.
Static Timing tooth In older software versions this was called “No. of teeth after missing” This parameter works in conjunction with Missing Tooth and Multi Tooth Modes. The ECU needs to know which tooth is the static (index) tooth. This is the tooth that is aligned with the sensor when the crank is somewhere between 15 deg BTDC and TDC. EG: If the static tooth is 5 teeth after the missing tooth/teeth or after the sync signal then set this parameter to 5.
36 - 1
60 – 2
12 - 1
The table below shows the maximum number of teeth after missing allowed for
different engines and missing teeth systems.
NOTE: When counting teeth, the missing tooth is counted as one tooth, if 2 teeth are missing then they are counted as 2 teeth. IE: for a 36 –1 tooth wheel you would count 35 teeth plus 1 missing tooth which equals 36 teeth.
Stinger 4 instruction manual version 2.0