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New for Version 31 Software
V31 and higher software now allows RPM Fuel values to be adjusted up to a maximum of 350, prior to
V31 max was 255. Also V31 can now produce an injector pulse width up to 65mS where older
versions only went to 32mS. This can benefit some applications with relatively large engine cylinder
displacement combined with a lower flow rate injector, which then may require an RPM Fuel value a
bit higher than 255.
Theory of Operation
Air temperature, CHT (or coolant temperature), manifold pressure, throttle position and rpm are all
measured and taken into account by the EM-5 which determines how often and how long the injectors
remain open. The EM-5 generates a precise triggering pulse, which is fed to the injectors. The
manifold pressure value multiplied by the rpm value determines the primary pulse width. Barometric
compensation in V29 software also corrects AFR with altitude behind the scenes, regardless of MAP.
Fuel System
In order for any EFI system to function properly, an adequate supply of fuel at the proper pressure
must be present at the injectors. Problems are invariably blamed on the electronics when in fact 99%
of all running problems are due to mechanical deficiencies. Most running problems are due to poor
electrical connections or insufficient fuel supply/ pressure issues. Failure to follow proper fuel
system recommendations and layout can cause a partial or complete power loss.
Any fuel system design must ensure that fuel feeds from the tanks to pump inlets at all times
during normal flight conditions including uncoordinated flight at high bank angles.
Injectors
We supply properly sized and matched injectors for your application. You should consult us if you plan
to use different injectors for some reason. Improperly sized or matched injectors can create
running or tuning problems and our mapping recommendations may not be valid. Undersized
injectors can cause engine damage in extreme cases.
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