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Power Strokes
6.4 Aftermarket
bov question
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[QUOTE="WoodBoy, post: 128111, member: 890"] You cant reference it to backpressure that is on the exhaust side. Backpressure is usually always going to be higher than boost dependent on your turbo setup. It isnt that the backpressure is higher than the boost, its the amount of psi being pushed back against the turbo shaft and trying to feed back through what wont feed into the cylinder due to restriction. As far as i know it has to be electronically controlled in order to function properly. When you get turbo "bark" essentially you have a certain amount of boost built up for instance 40psi while that the turbo is able to maintain this pressure at a certain rpm "XX,XXX" and when you let off, the 40psi is going to suddenly slow the turbo down as it looks for a means of escape. As soon as the turbo begins to slow down it is no longer able to maintain that amount of boost and the air pressure is able to force past the turbo creating the "bark". A BOV opens at this time electronically to allow the air to escape via the BOV vs backfeeding through the turbo. [/QUOTE]
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