BOV setup?

[TURBLUE]

I know this has been beat to death....I did a search and read some conflicting stories......
What is the proper BOV setup? Open at idle( approx 6"hg)
I have a rear mnt mcx with the BOV on the side of the intercooler and a malipassi dual spring as a second on the intake side of the intercooler.....anyone else run this one?
The one that comes on the intercooler I am not conviced its even opening....how could you check if it is?

Thanks in advance

 

[woodsrider]

you should be able to hear it dump when you chop the throttle fast. Personally I run mine closed at idle with very little spring pressure holding it closed and I hear it dumping on throttle position changes

 

[TURBLUE]

so the bottom part closes at a certian psi, but is open under boost? Then when it see a vacuum the top opens and the bottom closes when it reaches a certain psi........Is ths a good BOV?

 

[Ted Jannetty]

so the bottom part closes at a certian psi, but is open under boost? Then when it see a vacuum the top opens and the bottom closes when it reaches a certain psi........Is ths a good BOV?

Bypass/Blow off vavles should be open any time there is Vacuum Present in the Carb boots.

Boost pressure will seal the Bypass/blow off valve.

I recommend the lightest spring you can get about 1.5 in.Hg

Of all the Bypass/blow off valves I have tested the Vortech Race Bypass is superior.

Ted.

 

[TURBLUE]

anyone know if they make smaller springs for the bov I have?

 

[woodsrider]

Just cut your existing spring shorter to weaken the spring. Cut a little at a time to get the performance that you want. you can stretch the spring out if you have to so it will act upon the poppet.

 

[TURBLUE]

whats the purpose of the poppet(lower seal spring I assume)?

 

[woodsrider]

Not seeing all sides of the whole valve, id' say it is a two-stage blowoff valve. This would allow for a more consistent or linear performance.

 

[TURBLUE]

would it work better to take the bottom spring and seat out and set the upper spring so at idle it would be open? I was testing it in the shop I rigged up a air supply with a tee and a hose going to the top of the bov.....seemed to work without the bottom seat and spring.....make it a single stage I guess

 

[woodsrider]

I would try weakening the upper spring first before going single stage.