100% Authentic Tial Brand Product, made to last and withstand the heat long term

This auction is for one plain, unpainted bov spring.  See chart below.

Product Shipped same day as received payment

For Questions about our products call Import Evolution at 319-665-6612

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. Be sure to verify you are ordering for the correct BOV as the pressures are slightly different from the original BOV to the newer Q model.

Measure Vacuum at idle (engine at operating temperature)

For Tial Q and QR
Vacuum Reading between -22 in/hg and -23 in/hg use -12 psi spring - Brown
Vacuum Reading between -18 in/hg and -21 in/hg use -11 psi spring - Yellow
Vacuum Reading between -14 in/hg and -17 in/hg use -10 psi spring   Plain Unpainted
Vacuum Reading between -10 in/hg and -13 in/hg use -8 psi spring  White
Vacuum Reading between - 8 in/hg  and -11 in/Hg  use -6 psi spring  Black
Vacuum Reading between SUPERCHARGER ONLY use -2.00 spring Green