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
- 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)
- Continued operation of HVAC (this car does not have AC)
- 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
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}