Home / TiAL BOV Spring

TiAL Blow Off Valve Springs are available in 7, 9, 11, and 12 psi.

You should select your spring pressure based on your engine's vacuum reading at idle:

- Vacuum reading between -10in/hg and -12in/hg - 7 psi (small black) spring

- Vacuum reading between -14in/hg and -17in/hg - 9 psi (small white) spring

- Vacuum reading between -18in/hg and -21in/hg - 11 psi (un-painted) spring

- Vacuum reading between -22in/hg and -23in/hg - 12 psi (small pink) spring