6.7.4.4 Lambda Configuration
This block is used to set control parameters for the ECU to use the lambda signal to adjust fuel
enrichment while driving. Note that lambda sensor correction will only operate when the engine
temperature is above 60°C.
The target volts are the set point for the ECU to achieve during fuel correction. This limit is
different for the different types of fuel and vehicles. For normal pump gas the target voltage should
be around 0.45V (14.7 air/fuel ratio) and for methanol and alcohol between 0.75V and 0.85V.
Control percentage – This setting will give the ECU the ability to enrich or lean the fuel amount
by this %. This value will be implemented gradually over 0.2 milli-volt movement away from the set
point. It can be adjusted from 0 to 10% max. A value of 5% is standard. Always tune the ECU first
without the help of the lambda sensor and then activate it afterwards. This will get the best out of
the lambda sensor.
Number of Samples – This setting is the number of samples from the lambda sensor that the
ECU will average out. Then it will use this average to make adjustments in the fuel enrichment. A
typical a value of 100 for a 4 cylinder and 200 for an 8 cylinder is used. This setting is to create a
damping effect to the ECU do not hunt with this value. When set correctly the lambda signal
should not hunt more than 0.3 volt while driving.
Lambda Low Limit – This setting is to set the lowest vacuum setting that the ECU is allowed to
adjust the fuel. A standard here is 0.25 for normal aspirated engines. When the vacuum falls
below a certain value, the mixture has to be richer than 14.7 then the ECU are not allowed to
adjust the fuel. This setting will be indicated as a red bar on the vacuum map.
Lambda High Limit – This setting is to set the highest vacuum setting that the ECU is allowed to
adjust the fuel. A standard here is 0.75 for normal aspirated engines. When the vacuum goes
above a certain value at wide open throttle position, the mixture has to be richer than 14.7 then the
ECU are not allowed to adjust the fuel. This setting will be indicated as a green bar on the vacuum
map. This means that lambda loop control is only allowed between the low and high limit settings.
The Lambda bar indicates from 0 volt to 1 volt from left to right. This bar is used to tuning the ECU
for correct fuel levels under all conditions. The right green side is richer than 14.7 A/F ratio while
the left Red side is the lower than 14.7 A/F ratio.
6.7.5 Turbo Setup (Alt 4)
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