Bigger BOV?
Thread Starter
Instructor
Joined: Jul 2017
Posts: 228
Likes: 29
From: Southern Indiana
Bigger BOV?
I currently put 720 to the wheels on about 10psi. I am upgrading the fuel system and converting to E85. I will be going to a lot smaller pulley as well and hope to be closer to 18 psi. I currently have a 38mm BOV by A&A. Do I have to go to a bigger BOV?
Melting Slicks
Joined: Apr 2018
Posts: 3,185
Likes: 779
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Burning Brakes
Joined: Aug 2008
Posts: 855
Likes: 35
From: Katy/Houston Texas
That is a false statement. You want to have the bov before the innercooler so you don’t heat soak the innercooler with a bunch of hot air that you are just going to vent off. Also depending on what kind of tune you have in the car it can cause tuning issues. Bov placement should be as close to the head unit as possible and before the innercooler
Last edited by playtoy; Feb 29, 2020 at 11:23 PM.
Melting Slicks
Joined: Apr 2018
Posts: 3,185
Likes: 779
That is a false statement. You want to have the bov before the innercooler so you don’t heat soak the innercooler with a bunch of hot air that you are just going to vent off. Also depending on what kind of tune you have in the car it can cause tuning issues. Bov placement should be as close to the head unit as possible and before the innercooler
This.
Drifting
Joined: Nov 2014
Posts: 1,979
Likes: 110
From: Switzerland
to lazy to type:
"a BOV should be placed about 12 inches before the trotle body
reason behind it is so that when the butterfly closes and the pressure starts to reverse towards the turbo, as soon as the surge takes place, the BOV will bleed the pressure out and keep it as far form the turbo as possible, making sure the turbo doesnt surge and brakes"
"1.)Less of a loss in boost in between shifts (at least it's claimed)
or
2.) Less chance of compressor surge
Hmmmm....which one would you rather have? I'll take a lesser chance of surge anyday over a 0.5 second head start to getting back to full boost."
also check out the placement on stock vehicles.
"a BOV should be placed about 12 inches before the trotle body
reason behind it is so that when the butterfly closes and the pressure starts to reverse towards the turbo, as soon as the surge takes place, the BOV will bleed the pressure out and keep it as far form the turbo as possible, making sure the turbo doesnt surge and brakes"
"1.)Less of a loss in boost in between shifts (at least it's claimed)
or
2.) Less chance of compressor surge
Hmmmm....which one would you rather have? I'll take a lesser chance of surge anyday over a 0.5 second head start to getting back to full boost."
also check out the placement on stock vehicles.
Melting Slicks
Joined: Apr 2018
Posts: 3,185
Likes: 779
to lazy to type:
"a BOV should be placed about 12 inches before the trotle body
reason behind it is so that when the butterfly closes and the pressure starts to reverse towards the turbo, as soon as the surge takes place, the BOV will bleed the pressure out and keep it as far form the turbo as possible, making sure the turbo doesnt surge and brakes"
"1.)Less of a loss in boost in between shifts (at least it's claimed)
or
2.) Less chance of compressor surge
Hmmmm....which one would you rather have? I'll take a lesser chance of surge anyday over a 0.5 second head start to getting back to full boost."
also check out the placement on stock vehicles.
"a BOV should be placed about 12 inches before the trotle body
reason behind it is so that when the butterfly closes and the pressure starts to reverse towards the turbo, as soon as the surge takes place, the BOV will bleed the pressure out and keep it as far form the turbo as possible, making sure the turbo doesnt surge and brakes"
"1.)Less of a loss in boost in between shifts (at least it's claimed)
or
2.) Less chance of compressor surge
Hmmmm....which one would you rather have? I'll take a lesser chance of surge anyday over a 0.5 second head start to getting back to full boost."
also check out the placement on stock vehicles.
The factory location for all centri kits is exactly where we’ve said, close to blower before intercooler.
Last edited by 73DBG; Mar 1, 2020 at 06:58 AM.
Melting Slicks
Joined: Apr 2018
Posts: 3,185
Likes: 779
Now you can move it, mine isn’t in the exact spot anymore because I went with a Tial Q 50mm and we used all aluminum piping removed all the rubber hoses but it’s still before intercooler and close to the blower. I’ve seen some people use the location you speak of but there are zero kits that come with it in that location.
Procharger
Procharger
A&A
A&A
ECS
ECS
Most of us have meth nozzles spraying just up stream of where you suggest the BOV, again I’ve seen it in that location but never with meth spraying behind it. Interesting all three kits use the same location though...maybe ECS or A&A will jump in to give the down and dirty tech beside what has already been explained as why it’s comes in the factory location.
Last edited by 73DBG; Mar 1, 2020 at 09:00 AM.
Drifting
Joined: Nov 2014
Posts: 1,979
Likes: 110
From: Switzerland
the ecs kits come with the bov after the intecooler. others i think just put it where its most convenient. best bov location is close to tb, its a well known fact, sorry. (the bov is there to protect the compressor from surge, if you think about it it should make sence.)
Melting Slicks
Joined: Nov 2013
Posts: 2,049
Likes: 316
From: USA
Lots of OEMs now have the bypass/blow off built into the compressor housing, we can argue senselessly about what is 'best' but clearly any location on charge piping works fine. I think it just comes down to packaging and where it fits best, beyond that I wouldn't bother worrying. Hot side is probably best if you run a MAF though.
Melting Slicks
Joined: Apr 2018
Posts: 3,185
Likes: 779
the ecs kits come with the bov after the intecooler. others i think just put it where its most convenient. best bov location is close to tb, its a well known fact, sorry. (the bov is there to protect the compressor from surge, if you think about it it should make sence.)
now it is much more common and standard location for TT set ups
Burning Brakes
Joined: Jan 2016
Posts: 906
Likes: 160
the ecs kits come with the bov after the intecooler. others i think just put it where its most convenient. best bov location is close to tb, its a well known fact, sorry. (the bov is there to protect the compressor from surge, if you think about it it should make sence.)
