I am trying to specify a pnp system for my 1989 Porsche 964 Carrera 4
The car as it is 25/06/2014
Mechanical
- 3.6L
- 6 cylinder
- Upgraded "cup" cam of unknown lift and duration
- Decat pipe
- Permanent 4WD with centre and rear active differentials
Management
- 55pin Motronic
- Twin spark
- Twin distributor
- Twin coil (not coilpack or cop)
- Standard 252cc/min at 3.8bar high impedance injectors
- 2 wire style Bosch ISV
- Intake "resonance flap", vacuum actuator, electrically activated
- Carbon canister vacuum switch
Sensors
- VR crank trigger on flywheel 60-2, missing tooth is 84 degrees BTDC
- Hall sensor in distributor
- 4WD wheel sensor on rear diff, Hall
- 2x ABS wheel sensors
- Cylinder head temperature sensor (NTC)
- 2 knock sensors
- Narrowband O2 is fitted to most models, but this car had a factory option selected to remove this
- Standard AFM (Flap style)
- AIT (NTC type inside AFM)
- Altitude potentiometer
- Standard idle and wot switch (no analog TPS)
PLAN
- Source Porsche 964 PnP unit from Peep Paadam (vems.ee) to agreed specification, with suitable base map.
- To begin with I will keep the twin coils and distributors
- Fit an analog/potentiometer TPS
- Remove AFM and add a separate MAT.
- Add wideband 02
- Convert to Speed Density (MAP) operation
- Test idle and review if AplhaN+Map compensation would be better
TODO
- Measure and make bracket for TPS
- Measure and make AFM replacement pipe and hose joiners and either source top-hat adapter to keep std airbox
- Wire old AFM plug for AIT/MAT sensor (neatly and reversibly)
- Check continued operation of HVAC (this car does not have AC). There is one pin on the ecu which comes from the HVAC instructing not to cut fueling on overrun if heater is on - this is to maintain heat exchanger temps
- Check continued operation of ODB for ABS and 4WD diagnosis and testing
- Operation of "central informer" check engine light
- Find standard DME injector dead time table
- Find standard DME injector sequential vs batch fire operation
- Find standard AIT vs ignition retard and fuel adjust tables
- Check the distributor hall sensor is sufficient for ecu to camsync for full sequential injection and standard injectors will fuel adequately in full sequential mode.
- Check Peep will have performed O2 calibration on supplied unit
- Check best location for MAP sensor take off (before or after)
- Check best location for AIT/MAT sensor
- Is EGT desirable and retrofittable to PnP unit
- Find guideline EGT for aircooler 911
References
pin out here
![[PinOutImage]](http://site.ecudoctors.com/tech-data/Porsche_964/Pinout_964_0261200450.jpg){kind=link}
and here:
MembersPage/PeepPaadam/PorscheCarreraTwo
further information (some for 993 specifically)
MembersPage/PeepPaadam/PorscheCarrera
Injector info
http://forums.rennlist.com/rennforums/964-forum/555017-need-fuel-injectors.html
Standard DME coil dwell time table
![[Image]](http://forums.rennlist.com/rennforums/members/rogue_ant-albums-misc-picture25825-964-ignition-coil-dwell-time-in-milliseconds.png){kind=link}