SM4 Manual
by
MRM-Racing
V3.0
26
Ignition Trigger Edge
This setting is to determine what edge of the signal output from the ECU will
remain fixed. One edge of the square wave must always occur at a pre-set time,
and the other edge will be flexible and begin or end at various times. If you select
the wrong edge the ignition timing will be incorrect as RPM’s increase. These
setting also let you select between pulse or dwell.
Options are,
-ve edge (DWELL)
+ve edge (DWELL)
-ve edge (PULSE)
+ve edge (PULSE)
For coils with internal igniter modules or If using external modules
select -ve edge (DWELL)
Ignition systems like Honda, that use inverted dwell, ve edge (DWELL)
Autronic R500 CDI select -ve edge (PULSE)
MSD or Crane HI-6 ve edge (PULSE)
Injector Selection
Next you will want to open the tables called Injectors under the M1 Tab at the top of your
screen.
In this menu you will select the type of injectors you will be using from a very large list.
Each injector in this list has been carefully mapped for the correct control strategy based
on its electronic characteristics as battery voltages change. It is important to choose the
correct injector for optimum system performance.
If the injector you have in not in the list, consult you dealer for a recommendation of a
similar injector to use.
Injector events
Select number of injector events per engine cycle. For most engines this is the same as
the number of cylinders.
I/P Cylinder & sync
This menu consists of parameters for setting up the crank and cam trigger patterns so
that the ECU can properly calculate ignition and injection requirements.
It is important that these settings are selected properly, so be sure to consult your dealer
for proper settings based on your engine configuration.
