#####   
 ##  ##  
 ##      
 ##      
 ##      
         

     #   
         
    ##   
     #   
     #   
     #   
 #   #   
  ###    

         
         
 ##  ##  
 ##  ##  
 ##  ##  
  ####   
   ##    
         

         
### ##   
 ### ##  
 ##  ##  
 ##  ##  
 ### ##  
 ## ##   
###      

      #  
      #  
  ### #  
 #   ##  
 #    #  
 #   ##  
  ### #  
         

IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now.


Visit Preferences to set your user name
Summary of change:
Porsche 944 turbo/Injector & Flyback ? (v3.x serialnr 731) Due to engine failure, I had to build a new one. Found 3.0 litre 16valve Porsche 968 engine as a starting point. Now with Carillo rods, original forged pistons, cometic 3,2 mm headgasket, wich brings C/R down to 9,5. Garrett GT35/82R turbo. Engine harnes has been built out of original 968 wire harnes, each injector have own wire. Bosch wasted spark coil pack from VEMS shop. Racetronix high Z 846cc/min injectors. Trigger: Flywheel with 132 teeth and one reference tooth 67 degrees BTDC, two VR sensors. (Porsche 944 2,5 litre turbo engines trigger) VEMS: serianro 731 Power flyback 300kpa MAP LCD&PS2 4ign Driver Firmware 1.1.47 Have tried couple of times to start the engine, without success. Fuel pressure ok, I get some burning, in combustion chambers, but the engine do not want to start. * Originally Porsche has injectors 1&2 and 3&4 connected parallel. * Ok to use same connection with VEMS If using lowZ injectors, you must either * NOT have TS-diode in flyback path (this way you can do PWM-ing) * or have power resistors (6.8 Ohm 15..50W power resistors) in series with each injector (in this case you must NOT do PWM-ing) Transient diode is only built inside VEMS if you explicitely request so. * If you request powerflyback, you get powerflyback. * If you request low voltage flyback, you get low voltage flyback (this is easiest to measure: DVM diode mode shows appr 800..1200 mV between pin23 (cathode negative) and any of the 8 injector outputs (anode, positive) ---- '''Making Plug and Play motronic''' Old motronic box gave 35 pin connector. Make sure to follow the rules, most importantly the * grounding * and flyback rules. This is very important. Read MembersPage/PhatBob/UserGuide You can easily damage stuff if not following instructions, which really requires attention especially with a PNP install. The grounds will surely not be connected as required until you do it yourself. ---- '''Trigger''' * Polarity Trigger polarity: I found datasheet of bosch 0261209021 vr sensor, not the same as in Porsche (026121003), but looks just same and has same connectors. According to datasheet connector pin1/3 is N (first half wawe positive when passing magn.object). Pin 3 is shield (as in Porsche). So DME pins 27= Speed sensor+, DME pin 8=speed sensor-, DME pin23= speed sensor shield. DME pin 25= reference mark sensor+, DME pin 26= Reference mark sensor-, DME pin5= reference mark shield. All these must be verified by measuring. ** measure with DVM, 200mV DC mode. If your wheel has normal shape (missing tooth), than signel should be +few mV when you move ferrous metal (iron) towards the sensor, and -few mV when you move it away. The reading shows up for a very short time only (while the sensor actually sees the movement) ** Chancing crank home sensor polarity: On Audi trigger arrangement the polarity of crank home sensor should be reversed, same with porsche trigger (132 tooth+crank home)? Do NOT count on this. Do same DVM DC mV measurement for both VR sensors Trigger sensor shieldings: * connect to ground ** more precisely: connect to ground '''at''' the ECU (EC36pin26 GND) Nothing conflicting there. ''Hello! See my page MembersPage/PeteKrgr , I added some information about our Speed and Reference sensors.''
Optional: Add document to category:
Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.