DIYPNP Sequential Injection
Sequential Injection
The MS2/Extra 3.0.3 and higher code allows for 4 channel
sequential injection with a DIYPNP. This can run sequential
injection on a 4 cylinder, or semi-sequential on a 6 or 8. To
use this, you'll need our
DP_SEQMOD-K add on board. It attaches to the proto area with
the included 10 pin header; just solder the header in place and
run the two injector outputs over to the adapter board. Install
it so the two injector driver transistors are pointed out over
the proto area. For low impedance injectors, ground the GND hole
on the adapter board to a GND hole on the main board (do not
connect to SG).
The above picture shows one installed. Note that it covers a
portion of the proto area and the high side driver circuit on a
V1.5 board. The V1.5 board has headers in the proto area that
let you run the outputs through the board to the holes marked 3
and 4 at the edge of the main board.
The injectors are numbered by their firing order and fire in
a 1-2-3-4 sequence, so you'll need to jumper this to the adapter
board according to the engine's firing order. For example,
you'll connect the injector outputs as follows for a typical
inline four cylinder engine with a 1-3-4-2 firing order.
Main board INJ1: Cylinder 1
Main board INJ2: Cylinder 3
Expansion board INJ3: Cylinder 4
Expansion board INJ4: Cylinder 2
Now, you just enable sequential in software, and tune the
settings. This is done in the 'Advanced > Sequential Injection'
menu. There's really not much to 'tune' here unless you're just
dying to tune something. You really only need to set a few base
settings and then just let it rip. These settings were used on a
'99 Miata running sequential injection:
These settings are tuned to squirt at the intake valve
opening during cranking, and 10 degrees before it opens while
running.
The sequential code also allows you to use a timing table to
control the injector timing as a function of RPM and load, and
four individual injector trim tables. These can be accessed in
spreadsheet form under the Advanced menu, or as 3D maps on the
Tuning menu. For more information about the sequential code,
follow this link. The DIYPNP avoids the need for hardware
mods shown in that link that a normal MS2 would require, as the
processor outputs are brought out directly to the DIYPNP's 10
pin header.
Click here
to go back to the DIYPNP Extra Outputs page.
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