Tial Bv 50mm BOV

[65Cobra]

I don't know what spring to get for the Tial Bv 50mm BOV I recently picked up. It came with the Un-painted 11 psi spring but Tial will swap me for whatever spring I want. I just don't know what to tell them since the bike isn't running yet. Here is the Tial chart...

Engine Idle Vacuum:      Use Spring:
-22 and -23 in/Hg          Pink           -12 psi (-24 in/Hg)
-18 and -21 in/Hg          Un-painted -11 psi (-22 in/Hg)
-14 and -17 in/Hg          White         - 9 psi (-18 in/Hg)
-10 and -13 in/Hg          Black          - 7 psi (-14 in/Hg)

I think I need the Black spring but I'm not sure. Thanks.

 

[cdhoroho]

you want the black spring

 

[65Cobra]

Thanks for reinforcing what I thought.

 

[fstbusa]

depends on what you have your bike tuned for....? stage 1? definitely 7lb or less if running stock comp.

 

[65Cobra]

Although I pulled the motor to replace some items with APE equivalents (head gasket, case studs, head studs, oil pump gear, etc.) anything that would have affected the vacuum remained stock... no spacer, stock pistons, stock cams, etc. So my vacuum reading at idle should be that of a stock Busa.