DIGITAL ECU TUNER 3 – User Manual
Boost control
To control the boost pressure of the turbocharger, connect the proper 3 way electro valves . It should be able to
work with a relatively high frequency (>30Hz) and allow the control with duty cycle at least from 20% to 80%.
The electro valve should be connected in the following way:
The diagram below describes a way of connecting the 3 way electrovalve used to control boost for the turbocharger
with the integrated wastegate.
The described valve is opened between the endings 2 – 3, if it’s not powered. With the power on, the opened
connection is between 1 – 2 endings.
In the above connection, 0% of the PWM duty cycle gives minimal boost defined by the wastegate actuator’s
spring, 100% of DC causes maximal boost that the turbocharger can achieve.
To control the boost, MAP sensor must be used for the Load. It allows to control the boost in the feedback loop in
the pressure and RPM function.
When problems with the controlling boost occur, it may be necessary to use a restrictor at the electro valve input.
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+12V
Power Out #2 (18)
Power Ground (19)
DET 3
Electrovalve
+12V
DET 3, PIN 18
Zawór 3 drożny
3 Way Vale
1
2
3
Boost
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Bleed
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