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<blockquote data-quote="pollyp" data-source="post: 500787" data-attributes="member: 4527"><p>just as i found out with the ball valve and prob with bleed valve boost controllers, no, all they do is keep the WG shut upto the amount of psi u set it to open at (ie start to open at 5psi, which is negligable cos 0-5psi is below the boost threshold) but from 5-15psi (the extra 10psi of the actuator spring) the actuator responds at almost the same rate as before</p><p></p><p>porting the WG port too much may make it more sensative and harder to maintain smooth boost where too much exhaust is wasted per psi of boost increase. prob only enlarge the port if ur getting boost creep from overloaded WG</p><p></p><p>just read this Subaru boost control article which might be useful</p><p></p><p><a href="http://www.scribd.com/doc/104227/How-Subarus-Factory-Boost-Control-System-Works-v11-01" target="_blank">http://www.scribd.com/doc/104227/How-Subarus-Factory-Boost-Control-System-Works-v11-01</a></p></blockquote><p></p>
[QUOTE="pollyp, post: 500787, member: 4527"] just as i found out with the ball valve and prob with bleed valve boost controllers, no, all they do is keep the WG shut upto the amount of psi u set it to open at (ie start to open at 5psi, which is negligable cos 0-5psi is below the boost threshold) but from 5-15psi (the extra 10psi of the actuator spring) the actuator responds at almost the same rate as before porting the WG port too much may make it more sensative and harder to maintain smooth boost where too much exhaust is wasted per psi of boost increase. prob only enlarge the port if ur getting boost creep from overloaded WG just read this Subaru boost control article which might be useful [url]http://www.scribd.com/doc/104227/How-Subarus-Factory-Boost-Control-System-Works-v11-01[/url] [/QUOTE]
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