Tial Blow off Valve spring YELLOW 11 12 PSI BOV

Description

100% Authentic Tial Brand Product
This auction is for one YELLOW 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 separately 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)
Original 50mm BOV spring pressures
Vacuum Reading between -22 in/hg and -23 in/hg use -12 psi spring Yellow
Vacuum Reading between -18 in/hg and -21 in/hg use -11 psi spring  Plain Unpainted
Vacuum Reading between -14 in/hg and -17 in/hg use -9 psi spring   White
Vacuum Reading between -10 in/hg and -13 in/hg use -7 psi spring   Black
For Newer 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