BOV....What Spring Should I Use?

[Hot Air]

my car is mostly street driven with some Autocross in the future. What spring should I
run?

 

[Jerryl]

Does that not depend on the size of the BOV?

 

[20psiofevil]

I believe manifold vacum dictates spring pressure for the bov.

 

[Hot Air]

I agree but at what point do I want valve to open?

 

[20psiofevil]

It needs to stay shut until you shut the throttle after boosting. What bov are you running?

 

[Hot Air]

I have Godzilla (not installed) but looking at Tial Q 50mm on EBay. Come with 6 to 11 psi springs.

 

[Hot Air]

According to Tial's web site, spring selection is only dependent on engine vacuum at idle!!!!
Conrad

 

[bison]

Pressure test the intake tract and be sure the valve isn't opening under positive power. I've seen a problem with a t-netics BOV that opened under boost and crippled the car it was on


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[20psiofevil]

I use an adjustable 50mm. Bench tested to 30psi no leaking.

 

[Gnx6]

Either the plain spring or the yellow. With the white spring the valve will hunt open and closed at idle and run like poop. Ask me how I know...