2point2

I dont get it.

When you buy an electronic boost control solenoid one of the specs is a "switching frequency".

eg. Haltech is 30hz

What is the sol valve doing @ a (assuming fixed) 30hz vs boost pressure?

TurboEF9

All that thing does is use switch to activate a solenoid to switch between two "manual" boost controllers. Very simple. As far as 30Hz.. ----, I don't know.

2point2

found a good link. I think....

http://www.splparts.com/doc/tech/EBC.htm

This sounds wrong.. but I am freakishly tired right now..

"Suppose you want to run 14PSI of boost, then a electronic boost controller should do this -- when the boost reaches 14.1PSI, the solenoid will connect the wastegate to the intake, causing the wastegate to open (since 14PSI is higher than the 7PSI required to open the wastegate)... the turbo will start slowing down, when it drops to 13.9PSI, the boost controller will then switch the solenoid and connect the wastegate to the atmosphere. This causes the wastegate to close since the atmosphere is 0PSI lower than the 7PSI needed to open the wastegate, and the turbo will start speeding up again. This happens rapidly and keeps boost regulated nicely at 14PSI."

TurboEF9

Ya... that's stupid and doesn't make a whole lot of sense. Maybe someone has one that works like that. The other ones work by just restricting the flow of air to the wastegate so that it takes more force to open it.

It's like breating through a regular straw vs breathing through a coffee stirring straw. It'll take more force to blow something over blowing through the coffee stirring straw, than througha regular straw because the air flow is restricted (this case, due to the size of the straw). That is why they generally have an adjustment screw or something.