Trigger: div-by-43
- Actual settings:
- speed sensor (129 teeth) to Pin 27 (Eco36)
- reference sensor (1 tooth) to Pin 12 (Eco18)
- Pin 13 (Eco36)grounded (same ground like Pin26)
Additional Information:
- primary trigger: 129 is 43*3
- that is 43 per event: 43 is a prime number so cannot be divided. Therefore divide by 43 is the way to go with this trigger: the only way
- 129 means 258 for a full engine cycle, the max value for "Coil-type" + "normal" is 255 !
- using a divider is a must anyway, because only that allows a race-condition between secondary trigger and primary trigger, should the 2 falling edges of primtrig-VR and sectrig-VR be close
- timing from 3 pulses means that (crankhome-VR) pulse must be 35-75 crankdeg BTDC.
- Also, during cranking, relative angular acceleration is high (does not double, but RPM * 1.3 is possible) between consecutive events, so, as a result the actual spark will be slightly delayed during cranking when the engine suddenly comes alive
- this can be somewhat compensated with a few degrees higher sparkadv at 400 RPM. Does not effect normal running (even quick acceleration in gear1).
- if really 129, than 43 tooth per event per (if 6cyl). But with divby3 (and 43 tooth total,) next_trigger_tooth=14, 14*3=42 tooth (~2.75 degree percylinder spark delay) can be used to compensate this tooth...
- important: divby4 (11*4=44) is clearly invalid, there is no integer T=tooth_count for which 4 * T = 129 so trigger error would always be on with that (if it would run at all)
- So I need to use "Auditrigger DivbyN" option and a "Audi trigger divider" of 43.
- So number of teeth on wheel becomes 3 (carrying over what I see on the AUDI configs) confirmed!
- First trigger tooth = 0
- Next trigger tooth = 1
- Angular width of teeth = 120°
Good spark events with this c129 trigger (because of divby43, only 3 primtrig shown in triggerlog between sectrig pulses, not 129):
How it was made
- The "nr of cylinders" is only used by the ECU for the RPM calculation.
- For 6 cyl, normally 6 cyl must be configured (when 1 sectrig pulse every cam rotation). Possible with same primtrig setup, using "c258" trigger: that means using third (cam-HALL ) sensor masking out every 2nd pulse
- Since for the c129 trigger there is 1 sectrig pulse every crank rotation, in this case, "3 cyl" must be configured. (of course 6 injector outputs can be used).
- minimum 3 ignouts must be configured, even if all are the same (eg. when using distributer)
To adjust and verify "TDC after the trigger" setting, of course it's always good to verify actual spark-timing with strobelight, using 2 different sparkangle (eg. 2 deg and 18 deg).
RPMs are wrong, seems to be double value of real value !!!