TiAL Blow Off Valve Springs.
Available in 3 psi, 6 psi, 8 psi, 10 psi, and 11 psi.
Select the following spring pressures based on engine vacuum reading.
"Version 1" Tial 50mm BOV:
-24 to -26 in/Hg use Brown - 13 PSI spring
-22 to -23 in/Hg use Yellow - 12 PSI spring
-18 to -21 in/Hg use Plain -11 PSI spring
-14 to -17 in/Hg use White -9 PSI spring
-10 to -13 in/Hg use Black -7 PSI spring
0 to -7 in/HG (or supercharger) use Green -3 PSI Spring
"Version 2" Tial Q/QR BOV:
-22 to -24 in/Hg use Brown- 12 PSI spring
-20 to -21 in/Hg use Yellow -11 PSI spring
-16 to -19 in/Hg use Plain -10 PSI spring
-12 to -15 in/Hg use White -8 PSI spring
-8 to -11 in/Hg use Black -6 PSI spring
0 to -7 in/HG (or supercharger) use Green 2 PSI Spring
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