Tial BOV Spring 12psi

Tial BOV Spring 7psi

This section is to order a spring only. One spring comes with the purchase of a Tial BOV so you don't need to purchase one here seperately when ordering a Tial BOV. The following information is what Tial recommends as the default spring pressure to choose in their bov's. 11psi is the default spring and should be used if you don't know what spring to get.

Measure Vacuum at idle (engine at operating temperature

Vacuum Reading between -22 in/hg and -23 in/hg use -12 psi spring
Vacuum Reading between -18 in/hg and -21 in/hg use -11 psi spring
Vacuum Reading between -14 in/hg and -17 in/hg use -9 psi spring
Vacuum Reading between -10 in/hg and -13 in/hg use -7 psi spring