# someone explian this to me?

**URL:** <https://forums.speedlife.net/t/someone-explian-this-to-me/23676>\
**Category:** NYSpeed Off Topic\
**Created:** [January 27, 2007, 11:33am UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676 "2007-01-27T11:33:46Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![KuntryQuestTSi](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/kuntryquesttsi/32/5010_2.png) [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)\
**Post date:** [January 27, 2007, 11:33am UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676/1 "2007-01-27T11:33:46Z")

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i figured this is the closest place to post this, but a BOV blows off under boost, relives pressure when boosting and then theres no where for boost to go, but how would a BOV blow off when both my gauges read VAC?  
im special, excusse my spelling and lack of intelgence  
thanks

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**Author:** ![99\_civic\_si](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/99_civic_si/32/7319_2.png) [@99\_civic\_si](https://forums.speedlife.net/u/99_civic_si)\
**Post date:** [January 27, 2007, 1:17pm UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676/2 "2007-01-27T13:17:29Z")

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you are special 🙂 OK, seriously though. a BOV typically “blows off” under vac, or when the system is pressurized, then it sees vac. Hence where the whoosh sound comes from. When your boosting the thing that relieves boost pressure from keeping on building is your wastegate, which is often a charge actuated “BOV” in a sense, instead of a vac actuated. Make sense now??

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**Author:** ![articzap](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/articzap/32/7361_2.png) [@articzap](https://forums.speedlife.net/u/articzap)\
**Post date:** [January 27, 2007, 1:39pm UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676/3 "2007-01-27T13:39:44Z")

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wat?! does a wastegate not allow exhaust gases to bypass the hot side of the turbo so boost pressure does not increase past wat is set ont he mbc or ebc in combination with the wastegate spring?

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**Author:** ![KuntryQuestTSi](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/kuntryquesttsi/32/5010_2.png) [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)\
**Post date:** [January 27, 2007, 3:06pm UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676/4 "2007-01-27T15:06:10Z")

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o yea im am a complete idot i total forgot it was hooked to the wasgate and it was there haha im sure i’ll get shit for this tonight lol thanks im just trying to learn

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**Author:** ![HotRodKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/hotrodkid/32/7609_2.png) [@HotRodKid](https://forums.speedlife.net/u/HotRodKid)\
**Post date:** [January 27, 2007, 3:13pm UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676/5 "2007-01-27T15:13:47Z")

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thye BOV gets hooked to the intake manifold, when the throttle body closes and the BOV sees vacuum, the BOV opens to release pressure in the intercooler piping

the spring in the BOV should be strong enough that it only opens when theres vacuum in the manifold AND pressure in the intercooler piping

since your gauge should also be hooked to the intake manifold, it will read manifold vacuum when ever the BOV opens

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**Author:** ![articzap](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/articzap/32/7361_2.png) [@articzap](https://forums.speedlife.net/u/articzap)\
**Post date:** [January 27, 2007, 4:32pm UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676/6 "2007-01-27T16:32:34Z")

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[http://www.automotiveforums.com/vbulletin/showpost.php?p=3466587&postcount=8](http://www.automotiveforums.com/vbulletin/showpost.php?p=3466587&postcount=8)

Great write up.

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**Author:** ![KuntryQuestTSi](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/kuntryquesttsi/32/5010_2.png) [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)\
**Post date:** [January 28, 2007, 5:50am UTC](https://forums.speedlife.net/t/someone-explian-this-to-me/23676/7 "2007-01-28T05:50:30Z")

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yes it all makes sence now!!!  
lol thanks ya’ll