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Summary of change:
---- == Trigger: div-by-43 == ---- * ''' Pinout: ''' ** speed sensor signal (129 teeth per crank rev) to Pin 27 (Eco36) ** speed sensor ground to Pin 26 (Eco36) ** reference sensor ground (1 tooth per crank rev) to Pin 12 ''' (Eco18) ''' ** reference sensor signal to Pin 26 (Eco36) *** (reference sensor has swapped lines due to AUDI setup) ** Pin 13 (Eco36) grounded (same ground like Pin26) - * ''' Actual trigger setting ''' <- not recommended by support but works !!! ** Number of cylinders = 6 ** Audi trigger divider = 43 ** TDC after the trigger = 50.0 ** Number of Teeth On Wheel = ''' 6 ''' ** # of teeth of full engine cycle = ''' 6 ''' ** First trigger tooth = 0 ** Next trigger tooth = 1 ** Angular Width of Tooth = 120 degrees ** Reference trigger tooth table = 0, 5, 4, 3, 2, 1 ** This looks very nice in VEMSTune Trigger Settings Visual *** ''' engine runs with that ''', any downsides ??? *** masking the sectrig to only consider every second pulse ??? - ** http://www.vems.hu/files/MembersPage/MacB/Pics/trigger_visual.jpg - ---- ''' Additional Information by support team: ''' * 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): http://www.vems.hu/files/MembersPage/MarcellGal/BenchTest/Report-2013.08.21-22.00.57-c129/6cylPorsche_c129_divby43-1000RPM-triggerlog.png '''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) *** '''MacB: RPMs are doubled with this setup, i use the setup on top of the page and get the same output in triggerlog with correct calculated RPMs !''' [http://vems.hu/vemstune/bugreports/reports.php?cmd=view&key=tqeigX#comments more comments, and config] 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)'''. * MacB: ''' VERIFIED ! ''' - ----
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