KMS MP25(M)/MA25(M) manual Version 4.2
16
3.2.4.1.2 RPM limiters and Power Shift
3.2.4.1.2.1 Standard Limiters:
This menu can be used to set various speed limiters and
Power Shift.
The standard limiters include a soft and a hard limiter. The
soft limiter stops ignition partially so that power is lost.
The hard limiter switches off ignition completely.
For the KMS MP25(M) and MA25(M) management system the
maximum rpm limiter is 20.000 rpm *
*: with a 60-2 crank trigger pattern the maximum engine
speed is limited to 12.500 rpm.
Launch Limit RPM on button:
At launch limit an extra limiter (start line) can be set which
is activated, for instance, by a button that connects pin 19
to the ground. Depending on the type of button, NC
(normally closed) or NO (normally open), 'Input NC' will
have to be ticked or not. If the NO type is used
(recommended) do not tick the box. There is also the
possibility to set an extra launch limiter which makes it
possible to make the launch limiter variable between these
two rpm’s by connecting a potentiometer signal to the
analog aux input, which can be configured for this function,
see 3.2.4.1.7 Hardware configuration. The potentiometer
must have a range between 1 kΩ and 47 kΩ. The 5V and
ground for the potentiometer can branched from the
5V/ground sensor supply. The signal (wiper) of the
potentiometer must be connected to the analog input.
Advanced settings:
This can be used to built up boost pressure before start. 'Advanced settings' gives the possibility of
setting a fixed ignition moment (between 54 degrees before and 54 degrees after TDC. After TDC is
indicated by a negative number), fixed fuel enrichment and fixed PWM boost for several ascending
engine speeds. This enables a high boost pressure to be built up in turbocharged engines without
further increasing the engine speed. Additional fuel enrichment can be set when launch control is
activated, this is needed to cool the engine. During activation lambda-control is switched off.
Should the engine speed increase in spite of ‘ignition retard’, the startline limiter will intervene by
stopping ignition and injection. The boost pressure can also be limited during launch by setting the
duty-cycle (PWM-value) of the boost control-solenoid.
Warning:
When ignition retard is applied, the temperature of the exhaust gasses may
rise so high that the exhaust valves, exhaust manifold and turbocharger will
be damaged. We recommend you to activate this function for no longer than
a few seconds!
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