Correctly setting the triggers is the first step in getting an engine running. Note: You should also check you have routed the trigger signals correctly in terms of I/O. These are set correctly in basemaps for Plug-Ins and should not be changed in those cases.


You can confirm routing of the trigger input settings and the actual physical sensors wiring by monitoring the Crank/Cam IRQs while cranking.


Trigger Pattern:
This is the main trigger pattern, usually what is found on the crank (or on some models the CAS unit).

Crank Trig. Edge:
This defines what the ECU considers a ‘pulse’ - the rising or falling edge (or sometimes both) of the trigger wheel. Some ECU brands require correct polarity wiring of their crank/cam sensors. This option allows you to "try" both ways without swapping wires. Rising means the voltage at the Crank +Ve pin increases as a tooth approaches it, and falling means the voltage falls as the tooth moves towards the sensor. Both is used for specific modes for higher accuracy.

Cam Pattern
This is the camshafts trigger pattern. Typical patterns such as single lobe and various OEM are listed. If you plan to use the ECU for semi-sequential fuelling/ignition only, you can set this to ‘None’ to ignore it.

Cam Trig. Edge:
This defines what the ECU considers a ‘pulse’ - the rising or falling edge (or sometimes both) of the camshafts trigger pattern. See the troubleshooting section on ‘Getting Sync’ for more details of its use.

Ignore Cam After Sync:
You can choose to only "listen" to the cam sensor when looking to gain initial sync (or re-sync after a loss of crank-sync) using this option. It should only be used on non-VVT engines, and, ideally, not used at all. It can be handy if an engine has a high cam tooth count which causes noise at higher RPMs, and subsequently, lost sync events.

Trigger offset:
This is the offset in degrees that the triggering decoder software calls TDC (Top-Dead-Centre: when the piston is at the top of the cylinder on number 1) and the engine's ACTUAL TDC. See the guide on setting your trigger offset.

Trigger Filtering:
Use to reduce noise affecting triggering, the filter will help to get synchronisation quicker and maintain it.

Timing Delay(us):
This function should usually be set to 0, but it can be used to add a fixed amount of MicroSeconds onto each timing element. It is used to compensate for hardware latency if you notice ignition drift at higher RPMs. Note that timing lights will show rift at higher RPMs so do not rely on these to compensate. Only advanced users will need to adjust this should the need arise.

Sync Start/Loss Multipliers:
These are for advanced use only, and typically should be left at 1.3. They relate to the size of the ‘big gap’ tooth in relation to a normal tooth - with control for acceptance of these at both starting of sync, as well as the multiplier error that failed sync should be flagged.