Building a Porsche 3,0l 944 turbo
Now the details that affect VEMS specs and installation.
- original Bosch Motronic sensors will be used
- water temp x2 , oil press, knock
- exceptions are MAT and MAP, these will be from VEMS web shop
- original wiring loom will be used
- fuel injectors are SiemensDeka
- Static Flow Rate (GAS): 86 lb/hr @ 43.5PSI (300kPa) = 903cc/min, 10.88g/s
- Coil Resistance: 2.35 Ohms / Low Impedance / Low-Z
- Ignition for starters wasted spark, with option to COP
- TPS will most likely be the one that comes with ITBs
- For trigger see below
Configuration:
Tables:
Pictures:
History:
Trigger - Both are VR PPaadam
Porsche 944 turbo Trigger:
- 132teeth on flywheel -VR sensor
- Crank home (1 pin on flywheel 24.5 tooth, ie 66.8 dec BTDC 24.5 x 2.7272 deg, if i remember right) -VR sensor.
- No cam sensor
- And no missing teeth anywhere!
Shopping list
Assembled v3.3 controller
- 1-wire interface no
- ignition driver 4
- Knock and EGT yes
- LCD and PS2 yes
- MAP connection 400kPa onboard (5/3mm pneumatic) 'I'd recommend 6/4mm connection' PPaadam
- mounting-style screws
- PowerFlyback yes
- primary_trigger VR
- secondary_trigger VR ''Should be "auditrigger"' PPaadam
- EconoSeal36-Wire
- Econoseal18-Wire
- EGT sensor (K-type) Size 2mm
- K-thermocouple connector
- mounting-style panel-mount
- Sex pair
- mounting-style flyback
- Sex pair
- Wideband O2 sensor
- Wideband connector
- With wire with crimped wires
- MAT sensor
- Pneumatic valve 3way
Specifications:
Board_version=v3.3
Serial_nr= 748
pump-= 4.16V
wbo2_pump_pw_zero=0x67
wbo2_nernstdc_target=0x86
pump+= -3.3mV/200 Ohm
AREF=4.9V
(C103=1nF, no D100)
Firmware 1.1.24 1.1.24 or 1.1.25 seems like a good choice for 132+1
Auditrigger was initially according to PhatBob's instructions:
EC36#27 VR+ ( primary ) = CRANK speed sensor
EC36#13 VR+ ( secondary ) = reference sensor (whel HALL!)
EC36#26 VR- ( primary & secondary )
but changed to
EC36#27 VR+ ( primary ), = CRANK speed sensor
EC18#12 VR- ( secondary ), = VR reference sensor
EC36#26 VR- ( primary )
EC36#26 VR+ ( secondary )
after discussions with Miska. So installation instructions should be updated considering this part.
Trigger is: 132+1 per crankrot, or 264+2 per camrot (132+1 means you have 66 pulses on crank, and 1 pulse on cam). But above says differently
Here's a screenshot of my triggerlog made to a graph, nice and steady signal. So VEMS can be installed to a 132+2 system with 2 VR sensors and without cam home hall sensor. Firmware usd is 1.1.24.
