wastegate solenoid
Discussion
Hi,
The solenoid basically is an electrically driven pneumatic bleed valve that is triggered by a PWM-signal (pulse width modulation) via ECU.
The purpose is to open the second path (in a controlled way) to vent boost pressure partially that is present in the control line. The reduced pressure then reaches the wastegate capsules and keeps them more firmly closed (=less opening). This enables you to reach a higher boost pressure than the mechanical wastegate setting is allowing (mechanical settings: 4-Cylinder 0.65 bar, V8 0.35 bar).
Cheers
Marcus (www.PUKesprit.de)
The solenoid basically is an electrically driven pneumatic bleed valve that is triggered by a PWM-signal (pulse width modulation) via ECU.
The purpose is to open the second path (in a controlled way) to vent boost pressure partially that is present in the control line. The reduced pressure then reaches the wastegate capsules and keeps them more firmly closed (=less opening). This enables you to reach a higher boost pressure than the mechanical wastegate setting is allowing (mechanical settings: 4-Cylinder 0.65 bar, V8 0.35 bar).
Cheers
Marcus (www.PUKesprit.de)
Also, for the brave folks, one can introduce another bleed into this process in the from of a t-fitting, much like you find in an aquarium air bleed vent. You can do this on the line to the pressure sensor thereby reducing the amount of boost it sees, and, hence tricking it into allowing more. I've not done this on the Esprit, and don't plan to, but it should work.
We used to do such things in my youth and you'd be surpised how long a Ford 2.3 SOHC motor will run on 30psi, over 2 bar. But, when it lets go it lets go.
Ron
We used to do such things in my youth and you'd be surpised how long a Ford 2.3 SOHC motor will run on 30psi, over 2 bar. But, when it lets go it lets go.
Ron
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