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Summary of change:
Hi, i´m planning on installing a VEMS unit on a stock 89 Porsche 911 Carrera 3,2. Let me start with the facts found so far and my plans for application: - Motor 3,2litre normally aspirated - 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 patern is 0-5-4-3-2-1 ? (or does it has to be in firing order here?) As it seems I need to use the "Auditrigger" option I guess I also need to order the option for the ECU. - any drawbacks due to the 129 teeth variant, like rev limit or so ? - 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) ?
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