I developed a Plug and Play solution via adapter harness for Porsche 944 Turbo aka 951. It uses two ECU's, DME (Motronic 1.0) controls fuel and spark, the other (KLR) listens for knock and controls boost pressure.
Original ECU's:
All the necessary signals are available with stock harness, including healthy grounds. Here are pinouts:
DME:
KLR:
Here's my solution:
The car has 132+1 auditrigger crank trigger without cam sync, it uses distributor. Injectors are connected in pairs.
Now here's my issue.
I tested the setup on the running car and all sensors seemed to work except I did not get rpm signal. After disabling secondary trigger rpm showed which means tooth wheel reads fine. Secondary trigger is not visible in triggerlog also.
I used latest VEMStune and chose 4cyl_Porsche_132+1 configlet with divby11.
I configured secondary trigger per http://www.vems.hu/wiki/index.php?page=GenBoard%2FManual%2FInputTriggerHardWare
- Added 2nd LM1815
- SJ7 connected
- Routed wire to EC36 pin13 and left cam hall inverter bridge disconnected.
I also tried to reverse 2nd VR wires, no effect.
Here's vemscfg: https://www.upload.ee/files/4472538/944_Turbo_Stock.vemscfg.html