Quote:
Originally Posted by James Russels
What are the solutions to getting the BOV to open under less pressure? More vacuum/softer spring? From what I can figure, the only thing that would create more vacuum is a higher displacement engine. And what would I have to worry about with a softer spring? The BOV opening prematurely under low boost?
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Yeah you could try a softer spring, but too soft and it won't close. It should be completely closed at idle. The way it works is when you are accelerating, the pressure in the charge pipe is pushing to open it, but the engine/vacuum line are also pressurized, helping hold it shut along with the spring. When you let off throttle, the engine is quickly under vacuum again while the charge pipe is still pressurized, so the valve gives way and opens. I dunno if you have a tial bov or another brand, but if you search around, you can find how much vacuum the engine pulls at idle and which color spring that corresponds with.