# BOV placement **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [November 30, 2006, 12:20pm UTC](https://forums.speedlife.net/t/bov-placement/20919 "2006-11-30T12:20:45Z")\ **Posts on this page:** 8\ **Page:** 2
**Author:** ![turbo\_ls1\_ss](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbo_ls1_ss/32/7303_2.png) [@turbo\_ls1\_ss](https://forums.speedlife.net/u/turbo_ls1_ss)\ **Post date:** [December 1, 2006, 6:06pm UTC](https://forums.speedlife.net/t/bov-placement/20919/21 "2006-12-01T18:06:32Z")
> [@layzie](#): > > most drag cars dont even run a bov thats cuz most race cars are automatics 😉 i agree with the rest of the shit tho…id rather save my expensive turbo than have a little less psi drop ---
**Author:** ![layzie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/layzie/32/7599_2.png) [@layzie](https://forums.speedlife.net/u/layzie)\ **Post date:** [December 1, 2006, 6:14pm UTC](https://forums.speedlife.net/t/bov-placement/20919/22 "2006-12-01T18:14:21Z")
i was just making a point, shoulda made it more clear. they dont use one cuz they arent off the ass all the way down the track. and the only purpose of a bov is to save turbos :tup: ---
**Author:** ![Zer0DazE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zer0daze/32/7624_2.png) [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)\ **Post date:** [December 1, 2006, 6:44pm UTC](https://forums.speedlife.net/t/bov-placement/20919/23 "2006-12-01T18:44:59Z")
> [@layzie](#): > > the only reason a BOV is on a turbo system is to save the turbo from comp surge. i beg to differ. click the link i posted above, and read my post in that thread. pick up tuning forced induction cars there are a couple chapters dedicated to the history of the turbo, wastegate, and BOV. the BOV was not designed to keep the compressor alive, that was just a nice side effect. keeping it from surging, aka spinning the wrong damn direction, makes it spool up again much faster… ie less lag. its a great book for the shitter. some day when i unpack i will find the book agian, and you can borrow it if you want. ---
**Author:** ![Tunerfreak](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tunerfreak/32/7427_2.png) [@Tunerfreak](https://forums.speedlife.net/u/Tunerfreak)\ **Post date:** [December 1, 2006, 9:01pm UTC](https://forums.speedlife.net/t/bov-placement/20919/24 "2006-12-01T21:01:41Z")
so to sum up this whole thread and to get things straight closer to the turbo will save the turbo from compressor surge but cause a little more lag cause you lost pressure through the intercooler closer to the TB could possibly cause surge but will keep some pressure ---
**Author:** ![layzie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/layzie/32/7599_2.png) [@layzie](https://forums.speedlife.net/u/layzie)\ **Post date:** [December 1, 2006, 9:04pm UTC](https://forums.speedlife.net/t/bov-placement/20919/25 "2006-12-01T21:04:18Z")
> [@Zer0DazE](#): > > i beg to differ. > > click the link i posted above, and read my post in that thread. pick up tuning forced induction cars there are a couple chapters dedicated to the history of the turbo, wastegate, and BOV. the BOV was not designed to keep the compressor alive, that was just a nice side effect. keeping it from surging, aka spinning the wrong damn direction, makes it spool up again much faster… ie less lag. > its a great book for the shitter. > > some day when i unpack i will find the book agian, and you can borrow it if you want. lmk when u find it. is this the turbo book? ---
**Author:** ![Carnut](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/carnut/32/7590_2.png) [@Carnut](https://forums.speedlife.net/u/Carnut)\ **Post date:** [December 1, 2006, 10:19pm UTC](https://forums.speedlife.net/t/bov-placement/20919/26 "2006-12-01T22:19:30Z")
> [@Zer0DazE](#): > > its good to see you know why you should put it there, and you’re not just a sackrider. 😉 > > i don’t know why they aren’t making turbos with an intgrated BOV like porshe used to do. they make internally gated turbos why not add an internal BOV. it would make it easier for OEM to use them on cars. SRT 4 ---
**Author:** ![Zer0DazE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zer0daze/32/7624_2.png) [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)\ **Post date:** [December 2, 2006, 6:36am UTC](https://forums.speedlife.net/t/bov-placement/20919/27 "2006-12-02T06:36:39Z")
> [@layzie](#): > > lmk when u find it. is this the turbo book? this is the book ![http://ec1.images-amazon.com/images/P/1859606911.01._AA240_SCLZZZZZZZ_V61160085_.jpg](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/3X/c/9/c91295f537f1a171c661f7d86e60360905324c7b.jpeg) > **[Forced Induction Performance Tuning A Practical Guide to Supercharging and...](https://www.amazon.com/Induction-Performance-Practical-Supercharging-Turbocharging/dp/1859606911)** > > Forced Induction Performance Tuning A Practical Guide to Supercharging and Turbocharging \[Bell, A. Graham\] on Amazon.com. \*FREE\* shipping on qualifying offers. Forced Induction Performance Tuning A Practical Guide to Supercharging and Turbocharging > [@Tunerfreak](#): > > so to sum up this whole thread and to get things straight > > closer to the turbo will save the turbo from compressor surge but cause a little more lag cause you lost pressure through the intercooler > > closer to the TB could possibly cause surge but will keep some pressure no click the link i posted and read my post in that thread leaving it closer to the compressor should only vent what NEEDS to be vented, leaving the rest of the air in the pipe. > [@Carnut](#): > > SRT 4 no shit? really? thats pretty cool. ---
**Author:** ![n20junkie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/n20junkie/32/7396_2.png) [@n20junkie](https://forums.speedlife.net/u/n20junkie)\ **Post date:** [December 2, 2006, 7:09am UTC](https://forums.speedlife.net/t/bov-placement/20919/28 "2006-12-02T07:09:07Z")
> [@turbo ls1 ss](#): > > closer to the Turbo = save the turbo > closer to the TB = keep a little psi > > i have mine right after the compressor… Your physics is flawed. If the sense line is on the intake, the BOV opens when ever it senses a vacuum in the intake, and opens the BOV. So if the BOV opens when its placed near the TB, how would the pressure in the intake rise to damage the turbo, it can’t and won’t. If the BOV is near the turbo, it will dump all the pressure by venting air from the turbo, and the intake tubing and intercooler air will stop flowing, and will lose its velocity. Now when you stab the throttle you have to accelerate all that air, you will get a surge in pressure from the stored pressure in the intake, but once that is dumped the turbo will have to work overtime to accelerate all that air. If the BOV is placed near the TB, when it opens all of the air will maintain its velocity, and when you stab the throttle the BOV slaps shut and your off and running, everything is working because you never slowed that intercooler air down. Now on a street car you will never notice this, and the BOV in any position will protect all components. But the BOV wasn’t initally designed as a component savior, it was ment to keep the air moving in the intake side for road race cars. Many (not all) drag cars have the BOV if installed close to the throttle body for the same reason. If they waste all the energy to build boost, why not get all the air in the intercooler and piping moving at the same time. [Previous page](https://forums.speedlife.net/t/bov-placement/20919.md?page=1)