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.
Page 26
www.ecumaster.com
+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
To
w
as
tg
ate
Bleed
