[art leong]

Here are the instructions on how to set base timing. I'm starting to think I was told wrong by the guy that installed the unit.
He told me that I was setting the cam position sensor timing, and that it was telling the ecu that when it got the signal the next signal from the crank was tdc firing.
With the old software they put a timing light on the crank trigger to set it.
When I advance or retard the intake cam (where the cps is) I have to reset the offset, Even though I didn't touch the crank sensor or wheel

Here is a copy of the instructions Thanks

Once the correct Triggering Mode has been selected and Triggers 1 and 2 configured, the trigger timing must be calibrated by checking the ignition timing using a timing light. Doing this tells the ECU where the trigger signals occur in relation to engine position.







To Calibrate Triggers



1. In the Triggers->Calibrate menu, click the Set Base Timing button . This will open the Set Base Timing window.



2. While the Set Base Timing window is open, timing is locked to a constant value.



3. Enter the ignition timing value that you want to see with the timing light in the Lock Ignition Timing To: value. This value will depend on the location of available timing marks. 0 (TDC) and 10 deg BTDC are the most common values.




4. This step depends on the instructions shown in the Set Base Timing window.


· Adjust Offset until Ignition Timing matches the number above. Alter the number in the Offset setting until the timing light shows the number entered in the Lock Ignition Timing To: setting. Increase this number to advance ignition timing. Decrease this number to retard ignition timing.




· Adjust CAS until timing matches the number above. Mechanically rotate the position of the crank angle sensor (or distributor if it contains the CAS) until the timing light shows the number entered in the Lock Ignition Timing To: setting.




5. Click Done to keep the new Trigger Calibration settings. Otherwise click Cancel to restore the previous values.



6. Perform a STORE to permanently store the new trigger calibration setting to the ECU.

This explains trigger offset.
The Trigger Offset is used to calibrate the trigger timing so that the ECU can calculate the correct engine position at any time.



Trigger Offset is defined as the offset between TDC (between compression and power stroke) on cylinder number 1 and the first trigger event on Trigger 1 that occurs after the sync (Trigger 2). Therefore if the sync occurs and the next tooth on Trigger 1 passes the sensor at exactly TDC no. 1 then the required trigger offset will be 0. If this is not the case (and it typically will not be) then a non-zero Trigger offset will be required.


Although the trigger timing affects both fuel and ignition, it is easiest to calibrate the trigger timing by getting the ECU to try and deliver the ignition timing at a fixed angle (e.g 10deg BTDC) and checking that the ignition is actually occurring at this point using a timing light. This procedure is described under Trigger Calibration.



Note: As off Vi-PEC Tuning Software V4.4.0 and later this setting can only be adjusted in the Set Base Timing Window