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The Terminator
Turbo Cobras
?s about wastegates and BOVs?
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<blockquote data-quote="smashedheadcat" data-source="post: 5671310" data-attributes="member: 7756"><p>It shouldn't matter what springs are in the blow off valve. You don't want them very stiff. The spring should hold them closed and with a little effort, you can push them open. You have a vaccum/boost line that will run to the top of that piston. Vaccum in the manifold will open it and hold it open. In a zero vaccum/boost enviroment, the spring in the BOV will be biased towards closed. When boost pressure is present, the piston in the BOV will see equal pressure from the vaccum line (top of piston) and the charge tubing (bottom of piston). Since pressure will be equal on the top and bottom of the piston in the BOV under boost, it can be easily manipulated via a somewhat weak spring. If you run your BOV without a boost reference, spring rates inside the BOV become important.</p></blockquote><p></p>
[QUOTE="smashedheadcat, post: 5671310, member: 7756"] It shouldn't matter what springs are in the blow off valve. You don't want them very stiff. The spring should hold them closed and with a little effort, you can push them open. You have a vaccum/boost line that will run to the top of that piston. Vaccum in the manifold will open it and hold it open. In a zero vaccum/boost enviroment, the spring in the BOV will be biased towards closed. When boost pressure is present, the piston in the BOV will see equal pressure from the vaccum line (top of piston) and the charge tubing (bottom of piston). Since pressure will be equal on the top and bottom of the piston in the BOV under boost, it can be easily manipulated via a somewhat weak spring. If you run your BOV without a boost reference, spring rates inside the BOV become important. [/QUOTE]
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?s about wastegates and BOVs?
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