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Summary of change:
I´m planning on installing a VEMS unit on a stock 89 Porsche 911 Carrera 3,2. '''Plans''' * Motor 3,2litre normally aspirated ** number of cylinders=6 ? * trigger system is 2 VR sensors on flywheel / starter ring gear * rev sensor is sensing '''129teeth per crank rev''' - TDC sensor is sensing 1 pin on flywheel (don´t know yet how many degrees before TDC) - no cam or distributor sensor - stock NTCII at cylinder head #3 - AFM (flap type) will be removed, will use TPS instead (exchanging stock idle and WOT switch) - idle control valve is the "silver cigar" BOSCH thing, not sure if stepper motor or PWM ? - IGN distribution will remain untouched in first step, stock coil, stock distributor - stock fuel injector BOSCH 0-280-150-158 low-Z (2-3 Ohms) - wideband O2-sensor will be used intead of stock narrowband - no MAP, no airtemp sensor planned - Firing order for the Carrera is 1-6-2-4-3-5 - wiring should remain mainly stock with stock-DME-connector and only additional wires for wideband, TPS and so on - planning to use alpha-N only Now to the open issues: - primary trigger: 129 is quite hard to divide. 129 means 258 for a full eingine cycle, the max value for "Coil-type" + "normal" is 255 ! 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) First trigger tooth will be 0 Next trigger tooth 1 Angular width of teeth is 120° trigger pattern is 0-5-4-3-2-1 ? * write firing order also '''"Auditrigger" option for the ECU.''' * any drawbacks due to the 129 teeth variant, like rev limit or so ? ** if really 129, than 43 tooth per event per (if 6cyl). But with divby3, 14*3=42 tooth or with divby4, 11*4=44 tooth can be configured, so per-cylinder spark delay (~2.75 degree) can be used to compensate this tooth. * secondary trigger is the TDC-mark on flywheel * what to do for the low-Z-injectors ? is the 30V flyback ok and do i need the inline resistors (6,8 Ohm) ? ** '''order with "low-Z extension" option''' if you keep the high-Z injectors (and configure PWM-ing: ~35% PWM duty after 1msec full-voltage)
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