Injector firing

1. e8_pqck Saxperience Forum Bum Joined: Aug 2010 Midlands Posts: 2530 AX 16v Turbo

   #1 18th December 2010, 13:14

   Do saxo VTS injectors fire sequentially or in batches?
   
   Thanks
2. e8_pqck Saxperience Forum Bum Joined: Aug 2010 Midlands Posts: 2530 AX 16v Turbo

   #2 20th December 2010, 00:22

   semi sequential is the info i have.
   
   reason being is that i am adding bigger injectors so i need to space the rail. the extra height makes it clash with the chamber, so i've had to turn the injectors 180 degrees so the plugs are on the inside, except now they are handed so the wires are kinked a they are now pointing the wrong way.
   
   can i change injector plug 1 for 4 and 2 for 3 - shouldnt make a difference if they batch fire right?
3. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

   #3 20th December 2010, 06:41

   Quote:

   Originally Posted by e8_pqck semi sequential is the info i have. reason being is that i am adding bigger injectors so i need to space the rail. the extra height makes it clash with the chamber, so i've had to turn the injectors 180 degrees so the plugs are on the inside, except now they are handed so the wires are kinked a they are now pointing the wrong way. can i change injector plug 1 for 4 and 2 for 3 - shouldnt make a difference if they batch fire right?

   They will open and close sequentially
4. e8_pqck Saxperience Forum Bum Joined: Aug 2010 Midlands Posts: 2530 AX 16v Turbo

   #4 20th December 2010, 08:23

   hmm. 3 pin connector controlling 4 injectors with two wires to each...
5. yr51ocw Frequent Poster Joined: Oct 2005 Posts: 751

   #5 20th December 2010, 09:05

   one wire is a common signal. The other two wires is what will controll the paired injectors.
6. axsaxoman Saxperience Forum Bum Joined: Jan 2003 Scotland Posts: 3380

   #6 20th December 2010, 09:28

   to firs squentially you need an individual wire to each injector .
   ,must be at least five wires going to the loom conector to be squential and some form of cam phase sensing
   
   like a jp4 engine .
7. ryanmt Established Member Joined: Oct 2004 Warrington Posts: 1987 AX VTS 57 3.0 TDI A5

   #7 20th December 2010, 11:51

   Single plug is semi sequential, 3 plug is fully sequential
8. luthor1 Established Member Joined: Jan 2008 Posts: 1802

   #8 20th December 2010, 12:01

   How is the 3-plug fully sequential without a cam position sensor?
9. ryanmt Established Member Joined: Oct 2004 Warrington Posts: 1987 AX VTS 57 3.0 TDI A5

   #9 20th December 2010, 12:16

   The coilpack (grey plug only) feeds back a digital signal, depending on which cylinder took the most voltage to create a spark it works out which was under compression so it knows which is at TDC
10. axsaxoman Saxperience Forum Bum Joined: Jan 2003 Scotland Posts: 3380

    #10 20th December 2010, 14:40

    back EMF and crankshaft acceleration,same way it works out misfire detection
11. luthor1 Established Member Joined: Jan 2008 Posts: 1802

    #11 20th December 2010, 15:00

    Can you explain more about that Ryan since I understood the coilpack was wasted spark.
    
    I understood the digital signal was to report misfires only, and that the 3-plug has individual injector wiring for diagnostic reporting purposes only, not sequential injection
    
    I'm looking at some wiring diagrams here too
    EDIT: Just reading about it now!