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
Management
- 55pin Motronic
- Twin spark
- Twin distributor
- Twin coil (not coilpack or cop)
- Standard ~230cc high impedance injectors
Sensors
- VR crank trigger on flywheel(?)
- Hall sensor in distributor(?)
- 4WD wheel sensor on rear diff, Hall (?)
- 2x ABS wheel sensors
- Cylinder head temperature sensor
- 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, includes AIT)
- Standard idle and wot switch (no analog TPS)
PLAN
- To begin with I will keep the twin coils and distributors
- 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
- I will fit an analog TPS