VEMS install Porsche 911 Carrera 3,2 170kW/231PS motorcode 930-20, help needed

[ML952]

Hi,

i´m planning on installing a VEMS unit on a stock 89 Porsche 911 Carrera 3,2.
From what I read so far I´m quite confident that it should work, although there are no applictions so far ?
However some questions are left. (as it seems i´m the pioneer for the 911)

Let me start with the facts found so far and my plans for application:
- Motor 3,2litre normally aspirated
- trigger system is 2 VR sensors on flywheel / starter ring gear
- rev sensor is sensing 129teeth per crank rev
- TDC sensor is sensing 1 pin on flywheel (don´t know yet how many degrees before TDC)
- no cam or distributor sensor
- stock NTCII at cylinder head #3
- AFM (flap type) will be removed, will use TPS instead (exchanging stock idle and WOT switch)
- idle control valve is the "silver cigar" BOSCH thing, not sure if stepper motor or PWM ?
- IGN distribution will remain untouched in first step, stock coil, stock distributor
- stock fuel injector BOSCH 0-280-150-158 low-Z (2-3 Ohms)
- stock fuel pressure is 2,5bar
- wideband O2-sensor will be used intead of stock narrowband
- no MAP, no airtemp sensor planned
- Firing order for the Carrera is 1-6-2-4-3-5
- wiring should remain mainly stock with stock-DME-connector and only additional wires for wideband, TPS and so on
- planning to use alpha-N only

Now to the open issues:
- first step is to use as much stock as possible, get it running and then in the next step think about wasted-spark, sequential injection,...
- primary trigger: 129 is quite hard to divide, only possible value is 43 ! -> 6 triggers, 120° Will this work ? (AUDI div by n)
- any drawbacks due to the 129 teeth variant, like rev limit or so ?
- secondary trigger is the TDC-mark on flywheel
- what type is the idle control valve ?
- what to do for the low-Z-injectors ? Is there a bolt-in compatible high-Z-variant ? The stock setup is 3 injectors parallel for each bank.
The ones from the 964 are high-z but have lower cc/min @higher pressure

I´m looking forward to get into discussion with you guys.
Is there someone running a VEMS or MS on a 3,2litre ?

Best air-cooled grettings from Germany,
Marcus

[rollingjack]

What can I say, install VEMS ECU in 911 you are not pioneer, maybe you are this with your 3,2 liter engine.

Look:
My TPC-d 993 has now VEMS brain, intercooler and more.. - Rennlist Discussion Forums

and this:

Standalone install on stock 1992 964 C2 (dyno graph included) - Rennlist Discussion Forums

They both use only original flywheel triger, no more trigers.
idle control valve is PWM, not stepper.

[ML952]

Regarding the trigger wheel of 964 and 993:
They both use the 60-2 wheel which is default for all modern motronics and VEMS and....

[ML952]

no-one else any ideas ?