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 ~230cc 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
Questions
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
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)