I just have to find where it is defined how many times the extinguisher works.
there is a parameter in .emd files to set exactly that:
Ex:
Extinguishers 2
Just edit the number to suit your needs.
Normally this setting is found under [generic] section, but you can have a different setting for any engine variant, if its placed under its own variant section.
So, if there is not a particular parameter for a variant, the one in generic section will be used instead,
Ex:
(IAR_series.emd)
[generic]
...
Extinguishers 0 -->(This applies to all variants with no particular parameter set for extinguishers)
...
[IAR-1000A]
...
(no parameter for extinguisher in this engine variant, so the one in generic section is used -> Extinguishers 0)
...
[IAR-1000A1]
Extinguishers 1 --> (this parameter applies to all 1000A1 engines only)
...
hope it helps