help with INJ output to convert to sequential vr6.

[boostd audi]

i have a vr6 running on 1.1.88.  it is using batch injection curently.. i did wire a cam position in the car and i am trying to get it running full sequential..

i have the injectors wired

inj0 is cyl 1
inj1 is cyl 2
inj2 is cyl 3
.....
inj5 is cyl6

the firing order on the vr6 is 1 5 3 6 2 4


This is where i get confused.. cyl1 is at tdc which makes what cylinder the first on the intake stroke? or is it 2 strokes after is the  first injector to fire?  does this sound close? 


if someone could clarify for me i would appreciate it..  also on injector output visual how should i have them setup for sequential according to my wiring above

[mattias]

You must match the ignition and injector output tables. The row in the ignition output table that fires cyl 1 should in the injector output table fire the cyl 1 injector. The injector angle curve will then delay the closing time of the injection by typically 380-440 degrees which brings it into the intake stroke where the intake vale is starting to lift.
Create a "columns gauge" with "power profile"  - edit any gauge group, after creating gauge, right click to switch profile. Now you can watch the trigger variance of individual cylinders, useful to see which cylinder drops out when you pull an injector connector or disable one injector in the table.

[boostd audi]

i just someone can just explain the last part of that example above i can figure it out.. i get the fact that on a 1 3 4 2 engine the #4 is on inlet stroke as #1 just combusted at tdc.  so injection order above is 4 2 1 3. 

the next part
 which will cycle through the first 4 entries STARTING from the furthest right first, which in this case will be the forth number. So you must transpose the firing order to 3-1-2-4

is what i do not get.. is this from MT with the old Mask numbering the injectors? 

[mattias]

Lets do this with a picture instead, and the old MT information is out-dated.

Here's a 4 cyl (firing order 1-3-4-2) example where the coils are connected to outputs 1 through 4 for easier numbering and understanding how the ignition order looks like in the ignition output table. Injectors are connected to the pins in the columns that are labeled 1 through 4.

If the trigger forces you to use a different/shifted ordering of the ignition outputs, the injector table rows ("injgroup" 0 to 3) must also be shifted correspondingly, so that the same relationship still exists in time.

[boostd audi]

that makes sense

[mattias]

You said yourself, "the firing order on the vr6 is 1 5 3 6 2 4". 
So 1+6, 2+5 and 3+4 are the pairs.
Just like a straight/in-line 6 cyl.
http://sites.google.com/site/stoyneff/miscellaneous/vr6-firing-order-and-spark-plug-wires-connecting-order

You can test which injector is cyl 1 by pulling  the cylinder 1 fuel injector connector or un-ticking it in the injector outputs table, do that  with the engine running  and watch the column gauge with "power"  profile selected, cyl 1 is the one that drops.  Check the "F1 for help" documentation, search for "power" and check the section for individual power, there you will see which gauge bar represents which row in the ignition output table. On that same row in the injector output table is where the fuel injector for that cylinder should be for the injector angle curve to make sense.

In the future, VemsTune will be more helpful in telling you which cylinder is which...

[boostd audi]

got it working today.. thanks again