[PSIG]

At the low ends of the boost map in Speeduino, the PWM, signal supplies low duty cycle (off), allowing boost to build and higher duty cycle (on) at the top end, allowing the solenoid valve to vent the WG top back to the inlet vent and manage boost. Therefore, the correct balling of the valve is below and not as in my previous post;

Pierburg Boost Valve.jpg

IMO - almost there, and your logic appears sound. However, I never violate the engine/personal safety rule of:

… There are several ways to connect boost valves, for different wastegate types and different valves (how they function). In any case, the setup should allow the minimum boost possible if there is any failure of the solenoid, wiring or control. Default minimum boost for safety.

My personal rule is to ensure any failure of the valve, solenoid, connections, wiring, power or ECM will force minimum boost. I ignore other's labels, and only follow verified functional diagrams, in order to achieve my personal safety goals. Yours may be different. Assuming your testing confirms the functional diagram below, my connections to follow my rule would be labeled:

MOD - Pierburg boost valve labels.png (39.47 KiB) Viewed 722 times

By my understanding of the target engine setup and assumed goals, this labeling would ensure minimum boost with the valve OFF, and increased boost with the valve ON (ECM PWM), allowing me to follow my safety rule if this were my project. This is opinion. This is with some assumptions and is in no way a command, but a hypothetical discussion for shared perspectives, and education of all parties (including me). So tell us what you think of my personal perspective and logic approach, and correct any assumptions I may have made. Thanks!

[PSIG]

BTW - it can be confusing why changes might be made, or why it is different from a labeled diagram. Note this valve diagram labeling was originally for single-port internal wastegates, which use full WG boost signal to achieve minimum boost (valve off), and active control in order to increase boost (on) — the opposite of how we might use it with the top-port boost control of an external WG. For the original application, this also followed standard safety guidelines (minimum boost when off).

Knowing how the valve was originally used, or the application was configured can be avoided. We can clear all assumptions and view the functional connections for this configuration, and why the valve function was bench-tested. I hope that helps clarity and why I approach setup the way I do.

[kettlekev]

PSIG.

Thanks again and yes the diagram I posted confirms my testing. In the no ECU signal applied, the NC position is as drawn and yes applying your logic then in my labeling, full compressor would be applied to the WG top which is clearly bad and therefore I can only assume the original intent of the DIY-EFI valve as labeled was for a single port internal WG as you noted in the last post. SO GOOD CATCH!

And as you say in the no ECU signal NC configuration then no boost should be routed to the WG top, so your modified diagram is correct for my external WG configuration.

Therefore in a valve failure scenario, the top of the WG sees minimum boost which is then only set by the spring value. great golden rule!

Much appreciated and hopefully this helps others.....

[PSIG]

Cool. I'm sure it will.