Sequential Injection, installation and setup #2

TunerStudio seq inj setup:

Settings to change:
Squirts Per Engine Cycle: 1
Injector Staging: Simultaneous

Sequential Injection: Sequential/Semi-sequential
Timing Trigger: End-of pulse
Fixed Timing or Table: Fixed Timing
Fixed injection Timing 1(deg): -350
Cranking Injection Timing 1(deg): 360
Injector Drivers: Additional drivers

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When I was running batch, I used to hear that the injection timing is not right, but I couldn't do anything about it, now I can !

"Fixed injection Timing 1(deg)" will let you choose the deg you want the injector to shoot, you want it to shoot when the intake valve is closed.

You can play around with numbers, -350=370 if it makes it easier for you.
A full explanation can be found here:
http://www.jbperf.com/sequential/index.html

And here:
http://www.extraefi.co.uk/Seq_MS2.html

Make sure you use the numbers I gave or from DIYAUTOTUNE (which are the same).

Another thing, "Fixed Timing or Table", fixed timing of ~-350 will work, but a table with changing injection deg will work better (less fuel will be used)

This is the table I came up with:

This table works ok, if you want it perfect you need to tune it on a dyno.

Another advanced option, is "VE trim tables", when you enable this you can trim each injector in order to reach the same AFR/EGT on all cylinders...

I think you need 4 widebands/EGT for that.

After I finished installing and tuning seq inj, I've found out:

1. I need less fuel in general on fuel map - lower VE.
2. I don't need AE for now... (!) on the little tune trip I made I disabled AE and noticed car runs great ! (I will keep an eye on this)
3. Smoother idle - more accurate.
4. Better throttle response all around.

Thank you for reading !
Drop a comment !
Be safe !

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Barometric correction for 14$

Sequential Injection, installation and setup #1

Hey,

I just finished installing and setting up my seq inj kit.

Let me show you what is it about.

I'm talking about DIYPNP, other MS ECUs already feature seq inj or they can be upgraded in a similar way - check specific instruction for you specific ECU.

The kit:
Kit

Installation instruction:
Instructions

You need to solder the kit male header to the location pointed in the pic:

After Installation:

I run my MS without seq inj for sometime (if  I knew about it the first place I would have installed it from day one...)

Anyway, the default inj installation is batch (running two injectors at the same time), so two injectors were connected to one driver, as follow:

(from 96-97 instructions)

 You can see that INJ1 shoot 4U and 4W and INJ2 shoot 4V and 4X.

The seq inj kit will give us 2 extra INJ drivers (4 total) INJ3,INJ4.

Now !

Which INJ to which  pin ? (4U,4W,4V,4X)

I had to contact support for that - I think it should be a part of the instruction...

The instruction does say :

Main board INJ1: Cylinder 1

Main board INJ2: Cylinder 3

Expansion board INJ3: Cylinder 4

Expansion board INJ4: Cylinder 2

But it does not say nowhere (I looked...) which pin represent which cylinder...

And the answer is (for 96-97 Miata):

Output "INJ1" - 4U - Cylinder 1 Injector

Output "INJ2" - 4W - Cylinder 3 Injector

Output "INJ3" - 4X - Cylinder 4 Injector

Output "INJ4" - 4V - Cylinder 2 Injector

96-97 Diagram - Page 9

My DIYPNP:

The black wire on the left is just passing through the hole on the PCB, on its way to 4V.