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No. Of teeth per cam cycle

Use this parameter to set the number of teeth per cam cycle. Some trigger wheels run off the crank and others run off the cam. STINGER 4 ECUs are sequenced by cam cycles because this represents a full engine cycle. It is important that you enter the correct number of teeth in this parameter. If the trigger wheel is running off the crank then you must double the number of teeth counted. If the trigger wheel is running off the cam then count the teeth and use that number.

Sync Sensor Used

This parameter works in conjunction with missing tooth mode and Subaru from 2001 mode if you want to fire injectors and igniters sequentially (one coil per plug and one injector per port). Because most missing tooth wheels run from the crank or run the same RPM as the crank the ECU will receive 2 index signals per cam cycle and therefore true sequential is not possible. By reading a TDC sync signal from a cam or distributor wheel the ECU can then run in true sequential mode.

Running more than 1 tooth per cylinder

Set the Ignition Type parameter to “Normal”. If there are more trigger teeth per cam cycle than cylinders, then set the number of teeth per cam cycle parameter to the number of teeth counted. It is important to remember that 1 cam cycle is equal to 2 crank revolutions therefore if the trigger wheel is running off the crank then you must double the count.

Note: The number of teeth per cam cycle must divide down equally by the number of cylinders. Below is an example for a 24-tooth wheel on a 4-cylinder engine. eg. 24 teeth divided by 4 cylinders = 6. This is ok. eg. 18 teeth divided by 4 cylinders = 4.5. WILL NOT WORK!

The teeth must be spaced evenly and a sync sensor MUST be used. The trigger tooth directly after the sync sensor tooth is the index tooth and is usually positioned in front of the trigger sensor when the engine is somewhere between TDC and 15 deg BTDC on cylinder number 1.

Running 1 tooth per cylinder

In situations where there is 1 tooth per cylinder in a cam cycle you can select either “one tooth per cylinder” or a value equal to the number of cylinders in the “No of teeth per cam cycle” parameter. A sync sensor is not required if a single ignition coil with a distributor is used because the ECU will fire the ignition output once per trigger signal and the distributor will distribute the ignition to the correct cylinder. However, If you need to run coil-on-plug ignition then you must use a sync sensor on the cam. The trigger tooth directly after the sync sensor tooth is the index tooth and is usually positioned in front of the trigger sensor when the engine is somewhere between TDC and 15 deg BTDC on cylinder number 1.

Stinger 4 instruction manual version 2.0

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