KMS MD35 manual
Version 4.16 22
Main Load is: TPS + MAP as boost correction table
The ignition load table and lambda target
are linked to MAP value (The ignition table
for a turbocharged and supercharged engine
should always be linked to MAP). The
injection table however is linked to TPS and
works in combination with the boost
correction table to determine the main fuel
injection time.
The values in the boost correction table stand for a correction percentage over the nominal
correction ratio of 1:1. This means that if all values are 0 the fuel injection time will be calculated
by the injection time set in the injection table (TPS v RPM) and corrected with 1% per 1 kPa of MAP
pressure offset from 100 kPa. So if the injection time in the complete injection table is set at 10 ms
and boost correction table is set on 0, the injection time increases with 10ms/100kPa. What results
in a injection time of 20 ms at 200 kPa (1 bar boost) and 30 ms at 300 kPa (2 bar boost). If the
engine runs on 50 kPa (0.5 bar vacuum) the injection value will be 50% of 10 ms = 5 ms.
With the boost correction table set on 25% this will result in an extra 25% enrichment. So if MAP
pressure raises with 100 kPa the enrichment will not be 100% but 100 + 25 = 125% which results in an
injection time of 22.5 ms at 200 kPa (1 bar boost) and 35 ms at 300 kPa (2 bar boost).
In theory an engine runs on lower loads lambda = 1.00 (A/F 14.7 on pump gas) to meet emission
standards. However on higher loads it is recommended to run a richer mixture to keep the engine
under the critical combustion temperature where engine damage can occur. Typically for a charged
engine this would be a recommended lambda value between 0.75 - 0,85 (A/F 11.0 - 12.5). In theory
this means 17.6% - 33.6% more fuel is needed. In the boost correction table you can set extra
enrichment at every RPM and Map-load, see example in the figures below.
Main Load is : TPS + MAP as boost correction factor
The ignition load table and lambda target are linked to MAP value (the ignition table for a
turbocharged and supercharged engine should always be linked to MAP). The injection table
however is linked to TPS and works in combination with the boost correction factor to determine
the main fuel injection time.
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