getting lost with BOV
Thread Starter
Instructor
Joined: Aug 2007
Posts: 212
Likes: 0
From: Abu Dhabi
getting lost with BOV
now i am confused 
some said that for my ECS supercharge kit i should get bypass valve not BOV which i dont understand why many have recommend me to go with Tail 50 blow off valve but they told me it required tuning which i dont understand which kind of tuning its required and what type of springs i should use!!
also some said i should go with Vortech bypass valve which i am not sure if its better than bosch bypass valve which come with ECS kit or not !!
any recommendations guys FYI i have ECS2200 with 14lb boost and i need to be fit bottom right corner of intercooler i dont mind loud sound
some said that for my ECS supercharge kit i should get bypass valve not BOV which i dont understand why many have recommend me to go with Tail 50 blow off valve but they told me it required tuning which i dont understand which kind of tuning its required and what type of springs i should use!! also some said i should go with Vortech bypass valve which i am not sure if its better than bosch bypass valve which come with ECS kit or not !!
any recommendations guys FYI i have ECS2200 with 14lb boost and i need to be fit bottom right corner of intercooler i dont mind loud sound
Thread Starter
Instructor
Joined: Aug 2007
Posts: 212
Likes: 0
From: Abu Dhabi
Thread Starter
Instructor
Joined: Aug 2007
Posts: 212
Likes: 0
From: Abu Dhabi
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
Burning Brakes
Joined: Dec 2006
Posts: 1,165
Likes: 1
From: Houston TX
6 lb. spring, do not install in the charge pipe, done. Trust me, I banged my head with this longer than I should. The 6 lb. spring will keep the valve open at idle. Pre-intercooler is the ideal place.
Racer
Joined: Jun 2008
Posts: 370
Likes: 0
From: Somewhere in Portland,OR
I emailed Tial and that what i got from them.
Why are u warning against installing it in the charge pipe?
I am installing mine on the intercooler opposite side of the filter.
Did u try the 3 psi spring cause that what they told me to use but i like to hear what u found out.
I am installing mine on the intercooler opposite side of the filter.
Did u try the 3 psi spring cause that what they told me to use but i like to hear what u found out.
Last edited by v502; Oct 14, 2009 at 02:14 PM.
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Burning Brakes
Joined: Dec 2006
Posts: 1,165
Likes: 1
From: Houston TX
If you must have the BOV on the charge pipe, then you will need to run a spring where it holds the valve shut at idle. This isn't recommended though. If you get a spring that holds the valve open and install it in the charge pipe, it freaks out the MAF and it will not run right. Trust me, I was hard-headed and didn't listen to the people who knew what they were talking about and ended up causing myself more stress and headache.
Anywhere but the charge pipe is fine as it's too close to the MAF. Ideally before the intercooler, but if you install it on the intercooler itself, that's fine.
The 6 lb. spring will do the same as the 3 lb. spring, which is hold the valve open at idle.
Anywhere but the charge pipe is fine as it's too close to the MAF. Ideally before the intercooler, but if you install it on the intercooler itself, that's fine.
The 6 lb. spring will do the same as the 3 lb. spring, which is hold the valve open at idle.
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
If you must have the BOV on the charge pipe, then you will need to run a spring where it holds the valve shut at idle. This isn't recommended though. If you get a spring that holds the valve open and install it in the charge pipe, it freaks out the MAF and it will not run right. Trust me, I was hard-headed and didn't listen to the people who knew what they were talking about and ended up causing myself more stress and headache.
Anywhere but the charge pipe is fine as it's too close to the MAF. Ideally before the intercooler, but if you install it on the intercooler itself, that's fine.
The 6 lb. spring will do the same as the 3 lb. spring, which is hold the valve open at idle.
Anywhere but the charge pipe is fine as it's too close to the MAF. Ideally before the intercooler, but if you install it on the intercooler itself, that's fine.
The 6 lb. spring will do the same as the 3 lb. spring, which is hold the valve open at idle.
For the 6# spring to be open at idle, you have to be making 12# vacuum at idle. Anything less and the BOV will stay shut.
FYI, I would run a proper 2bar in any FI setup, but that's me.
Seen here -
Last edited by Drewstein; Oct 15, 2009 at 12:08 PM. Reason: Added picture of my old setup.
Burning Brakes
Joined: Dec 2006
Posts: 1,165
Likes: 1
From: Houston TX
I don't know all about the specifics on MAFs, but with a stock LS2 MAF and a spring that holds the valve open at idle with the BOV/BPV installed in the charge pipe, it freaks it out and runs like crap. Sounds like it has a miss at idle.
Now with a spring that holds the valve shut at idle, it runs fine, however, it's not recommended that a supercharger not be vented at idle.
I still run the stock LS2 MAF, used the 6 lb. spring, and located the BOV to the metal pipe that goes around the cradle near the passenger side front tire. No issues and it's open at idle.
Now with a spring that holds the valve shut at idle, it runs fine, however, it's not recommended that a supercharger not be vented at idle.
I still run the stock LS2 MAF, used the 6 lb. spring, and located the BOV to the metal pipe that goes around the cradle near the passenger side front tire. No issues and it's open at idle.
Pro
Joined: May 2006
Posts: 743
Likes: 0
From: Toms River NJ
I am running this valve on my supercharged ls2. It's mount near the intercooler. When I let off the gas, you can hear the boost vent to atmosphere continuously until I step on the gas again, then you hear it close up. Is that how it should function on a supercharged unit? Or should it work like it would on a turbo application where it's just chirping between shifts? If so, how do you go about changing the spring? and will it affect my tune?
Thanks,
Adam
Thanks,
Adam
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
I am running this valve on my supercharged ls2. It's mount near the intercooler. When I let off the gas, you can hear the boost vent to atmosphere continuously until I step on the gas again, then you hear it close up. Is that how it should function on a supercharged unit? Or should it work like it would on a turbo application where it's just chirping between shifts? If so, how do you go about changing the spring? and will it affect my tune?
Thanks,
Adam
Thanks,
Adam
Also we're talking at idle, as if you started you car and just sat there you should have the BOV open. The reason being is a supercharger is producing boost and it has no place to go.
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
A properly adjusted BOV/BPV for a centrifugal supercharger remains open until just before atmospheric pressure is reached. I have a Tial Q w/ 3# spring and you can hear air escaping through it until I cross over into boost. You want it open just until you cross over into boost because the blower is trying to make boost all the time.
If it closes too soon then you could be cruising down the road in vacuum but the BOV is closed so the extra air that theengine cannot use is backloading the compressor wheel and making alot of heat and putting stress on the blower.
HTH
If it closes too soon then you could be cruising down the road in vacuum but the BOV is closed so the extra air that theengine cannot use is backloading the compressor wheel and making alot of heat and putting stress on the blower.
HTH
Pro
Joined: May 2006
Posts: 743
Likes: 0
From: Toms River NJ
A properly adjusted BOV/BPV for a centrifugal supercharger remains open until just before atmospheric pressure is reached. I have a Tial Q w/ 3# spring and you can hear air escaping through it until I cross over into boost. You want it open just until you cross over into boost because the blower is trying to make boost all the time.
If it closes too soon then you could be cruising down the road in vacuum but the BOV is closed so the extra air that theengine cannot use is backloading the compressor wheel and making alot of heat and putting stress on the blower.
HTH
If it closes too soon then you could be cruising down the road in vacuum but the BOV is closed so the extra air that theengine cannot use is backloading the compressor wheel and making alot of heat and putting stress on the blower.
HTH
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
I run the 3# pink spring (the 12# is also pink so be careful). Here is a good (long) thread on Tial spring choice. Better fill up your coffe cup before clicking.
http://forums.corvetteforum.com/c5-f...ch-spring.html
So my recommendation is the 3# spring but if you dont lke the fact that it is open ALL the time then you can go higher but keep in mind you will be backloading the compressor wheel any time you're creating more boost than you can use. The 3# spring will prevent this more than any other. I'd definitely go with something lower than the 11# spring though.
http://forums.corvetteforum.com/c5-f...ch-spring.html
So my recommendation is the 3# spring but if you dont lke the fact that it is open ALL the time then you can go higher but keep in mind you will be backloading the compressor wheel any time you're creating more boost than you can use. The 3# spring will prevent this more than any other. I'd definitely go with something lower than the 11# spring though.
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11