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Summary of change:
== Installing a VEMS unit on a stock 89 Porsche 911 Carrera 3,2. == ---- MembersPage/MacB/Config ''' <- please verify ''' http://www.vems.hu/files/MembersPage/MacB ---- == Open Issues == ''' Help needed ''' * ''' Can´t get the sectrig working: ''' ** Can only get the primary trigger (129 teeth) to record anything in trigger recorder. ** When I enable the CamSync for Sectrig, I don´t get any recordings anymore. ** Tried out several pinnings of the two VRs, but nothing helped. See triggerlogs. under /Config ** Also tried to disconnect ground to Pin13 but without success. ** Actual settings: *** speed sensor (129 teeth) to Pin 27 *** refernce sensor (1 tooth) to Pin 12 *** Pin 13 grounded (same ground like Pin26) ** Actual firmware: 1.2.11 (Any other firmware needed ???) * ''' Alternative trigger setting ''' can somebody ''' <- please verify ''' ** Number of cylinders = 6 ** Audi trigger divider = 43 ** TDC after the trigger = 60.0 ** 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 much nicer in VEMSTune Trigger Settings Visual, but will it work ??? *** masking the sectrig to only consider every second pulse ? * ''' injectors are grouped 1,2,3 and 4,5,6 ''' ** Req Fuel (Injector size) = 14.9ms (6,49 *(3164ccm/'''6'''/229,1ccm/min)) ** Injector firing Divider = ''' 3 ''' ** Number of primary injectors = ''' 2 ''' * ''' Coil charge time @13,2V = 3,01ms ''' ** is this a good start value for a single BOSCH coil setup ? ---- '''Engine specs''' * 3,2litre flat-six '''normally aspirated''' ** number of cylinders=6 (even fire) * trigger system is '''2 VR sensors on flywheel / starter ring gear''' (crankwheel) ** rev sensor is sensing '''129teeth per crank rev''' *** 43*3, so divide-by-N N=43 *** the rest like ''reference tooth'' almost like with 3 teeth on the crank: a c003 trigger if sectrig comes just from 1 crankpulse, ( or c006 if camsync is also installed - which is not, at least initially ) ** TDC sensor is sensing 1 pin on flywheel (don´t know yet how many degrees before TDC). *** Will likely need to have (access to) a '''strobelight''' to verify all is well. * no cam or distributor sensor ** with auditrigger camHALLinverter the '''EC36/13 input must be grounded''' to allow the crankhome-VR pulse to go through. * 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, two wires to ECU, so 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) ** '''order with "low-Z extension" option''' if you keep the high-Z injectors (and configure PWM-ing: ~35% PWM duty after 1msec full-voltage) * wideband O2-sensor will be used intead of stock narrowband * no MAP. ** It would be easier to tune with a MAP sensor, but also possible with TPS, with more work * MAT now planed ** The '''MAT sensor is almost a MUST''' (in a normally aspirated engine MAT sensor can be an NTC in the air-filter, very simple and cheap, just make sure the engine will never inhale it) * '''Firing order is 1-6-2-4-3-5''' for the Carrera * 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 ---- '''Trigger: div-by-43''' * 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° ---- '''VEMS-spec: / Needed parts''' * VEMS Board version v3.6 ** Serial nr.= 8234 ** (Order ID= 8044) ** Flyback: LowZ active flyback 8ch ** ignition driver: 8 ** primary_trigger: EC36/27 VR ** secondary_trigger: auditrigger w/camHALLinverter ** Knock input channels: 0 ** LCD connection: no ** MAP connection: offboard(electronic) ** mounting-style: no-screws ** 1-wire interface: no ** EGT input: no ** PS2 connection: no ** withSDcard: no * Other stuff: ** TPS from E36 (Hella): 6PX 008 476-111 *** Adapter plate DIY ** WBO2 (Bosch): 0 258 007 351 ** MAT (Bosch): 0 280 130 039 *** intake pipe DIY ** 1 x Wideband connector ** 1 x Econoseal18-Wire side ** 1 x EconoSeal36-Wire side ** Some other connectors etc. ---- ---- ''' Related projects by other users: ''' Looks like a similar setup: MembersPage/KevinBlack/PorscheTurbo
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