Quote:
Originally Posted by anotherblusi
Its spelled solenoid buddy...
And heres an easier explanation.
This is for the ideal situation. So the top portion that you took apart exposes the diaphragm. Without any spring inside, if you supply pressure to the lower port, the valve will open and if you supply pressure to the top port it will close the valve. Now with say a 7psi spring on top of the diaphragm. The lower port will now need to see a pressure of 7+psi in order for the valve to open. This is what allows you to hold 7psi of boost and not go over.
Now with a boost controller on the top port, it can supply added pressure to the spring pressure, essentially increasing the amount of boost required to open the wastegate.
Also with the HKS wastegate it also has an adjustment screw on top that can compress/decompress the spring. Then by compressing the spring you can increase the spring pressure and thus increase the amount of boost required to open the wastegate. You can test this by supplying incremental amounts of pressure to the side and see when the valve opens.
But in reality you also have exhaust gasses supplying pressure/vacuum to the bottom of the valve. This will be significantly dependant on your manifold design. This basically means that even though you have a 7psi spring in the wastegate, you will not necessarily see 7psi of boost. It can be less or in most cases you will see more boost.
Finally, the exhaust gas pressure/vacuum in the manifold is very dynamic, changing at different rpms, loads, etc.... This is what usually causes boost creep and spikes. Basically what it boils down to is that you just have to try a few different spring pressures that gets you the boost you want.
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Thanks for the spelling advice. Now if only you could work on your technical advice you'd be a ZILVIA MASTER. The EBC works exactly as I described in relation to his EWG. Sure I don't have the 'Mr Science' terminology you may have been looking for, but at least the description is correct.
Certainly every EWG is a bit different, but the function is the same in relation to EBC (this side of a Synapse, but that's a bit goofy anyway)